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329 results on '"Kangaslahti, Pekka"'

151. An MMIC Low-Noise Amplifier Design Technique

Author

Varonen, Mikko, primary, Reeves, Rodrigo, additional, Kangaslahti, Pekka, additional, Samoska, Lorene, additional, Kooi, Jacob W., additional, Cleary, Kieran, additional, Gawande, Rohit S, additional, Akgiray, Ahmed, additional, Fung, Andy, additional, Gaier, Todd, additional, Weinreb, Sander, additional, Readhead, Anthony C. S., additional, Lawrence, Charles, additional, Sarkozy, Stephen, additional, and Lai, Richard, additional

Published
2016
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154. Test methodology for the geostar correlator

Author

Austerberry, David, primary, Gaier, Todd, additional, Kangaslahti, Pekka, additional, Lambrigtsen, Bjorn, additional, McKague, Darren, additional, Ramos, Isaac, additional, Ruf, Chris, additional, and Tanner, Alan, additional

Published
2015
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155. A WR4 Amplifier Module Chain With an 87 K Noise Temperature at 228 GHz

Author

Varonen, Mikko, primary, Samoska, Lorene, additional, Fung, Andy, additional, Padmanabhan, Sharmila, additional, Kangaslahti, Pekka, additional, Lai, Richard, additional, Sarkozy, Stephen, additional, Soria, Mary, additional, Owen, Heather, additional, Reck, Theodore, additional, Chattopadhyay, Goutam, additional, Larkoski, Patricia V., additional, and Gaier, Todd, additional

Published
2015
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156. Argus: A W-band 16-pixel focal plane array for the Green Bank Telescope

Author

Devaraj, Kiruthika, Church, Sarah, Cleary, Kieran, Frayer, David, Gawande, Rohit, Goldsmith, Paul, Gundersen, Joshua, Harris, Andrew, Kangaslahti, Pekka, Readhead, Anthony, Reeves, Rodrigo, Samoska, Lorene, Sieth, Matthew, Voll, Patricia, Devaraj, Kiruthika, Church, Sarah, Cleary, Kieran, Frayer, David, Gawande, Rohit, Goldsmith, Paul, Gundersen, Joshua, Harris, Andrew, Kangaslahti, Pekka, Readhead, Anthony, Reeves, Rodrigo, Samoska, Lorene, Sieth, Matthew, and Voll, Patricia

Abstract

We are building Argus, a 16-pixel square-packed focal plane array that will cover the 75-115.3 GHz frequency range on the Robert C. Byrd Green Bank Telescope (GBT). The primary research area for Argus is the study of star formation within our Galaxy and nearby galaxies. Argus will map key molecules that trace star formation, including carbon monoxide (CO) and hydrogen cyanide (HCN). An additional key science area is astrochemistry, which will be addressed by observing complex molecules in the interstellar medium, and the study of formation of solar systems, which will be addressed by identifying dense pre-stellar cores and by observing comets in our solar system. Argus has a highly scalable architecture and will be a technology path finder for larger arrays. The array is modular in construction, which will allow easy replacement of malfunctioning and poorly performing components.

Published
2014

157. Argus: A 16-pixel Millimeter-Wave Spectrometer for the Green Bank Telescope

Author

Holland, Wayne S., Zmuidzinas, Jonas, Sieth, Matthew, Devaraj, Kiruthika, Voll, Patricia, Church, Sarah, Gawande, Rohit, Cleary, Kieran, Readhead, Anthony C. S., Kangaslahti, Pekka, Samoska, Lorene, Gaier, Todd, Goldsmith, Paul F., Harris, Andrew I., Gundersen, Joshua O., Frayer, David, White, Steve, Egan, Dennis, Reeves, Rodrigo, Holland, Wayne S., Zmuidzinas, Jonas, Sieth, Matthew, Devaraj, Kiruthika, Voll, Patricia, Church, Sarah, Gawande, Rohit, Cleary, Kieran, Readhead, Anthony C. S., Kangaslahti, Pekka, Samoska, Lorene, Gaier, Todd, Goldsmith, Paul F., Harris, Andrew I., Gundersen, Joshua O., Frayer, David, White, Steve, Egan, Dennis, and Reeves, Rodrigo

Abstract

We report on the development of Argus, a 16-pixel spectrometer, which will enable fast astronomical imaging over the 85–116 GHz band. Each pixel includes a compact heterodyne receiver module, which integrates two InP MMIC low-noise amplifiers, a coupled-line bandpass filter and a sub-harmonic Schottky diode mixer. The receiver signals are routed to and from the multi-chip MMIC modules with multilayer high frequency printed circuit boards, which includes LO splitters and IF amplifiers. Microstrip lines on flexible circuitry are used to transport signals between temperature stages. The spectrometer frontend is designed to be scalable, so that the array design can be reconfigured for future instruments with hundreds of pixels. Argus is scheduled to be commissioned at the Robert C. Byrd Green Bank Telescope in late 2014. Preliminary data for the first Argus pixels are presented.

Published
2014

161. Argus: a 16-pixel millimeter-wave spectrometer for the Green Bank Telescope

Author

Sieth, Matthew, additional, Devaraj, Kiruthika, additional, Voll, Patricia, additional, Church, Sarah, additional, Gawande, Rohit, additional, Cleary, Kieran, additional, Readhead, Anthony C. S., additional, Kangaslahti, Pekka, additional, Samoska, Lorene, additional, Gaier, Todd, additional, Goldsmith, Paul F., additional, Harris, Andrew I., additional, Gundersen, Joshua O., additional, Frayer, David, additional, White, Steve, additional, Egan, Dennis, additional, and Reeves, Rodrigo, additional

Published
2014
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163. Noise sources for internal calibration of millimeter-wave radiometers

Author

Parashare, Chaitali R., primary, Kangaslahti, Pekka P., additional, Brown, Shannon T., additional, Padmanabhan, Sharmila, additional, Tanner, Alan B., additional, Montes, Oliver, additional, Dawson, Douglas E., additional, Gaier, Todd C., additional, Reising, Steven C., additional, Hadel, Victoria D., additional, Johnson, Thaddeus P., additional, and Bosch-Lluis, Xavier, additional

Published
2014
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167. Argus: A W-band 16-pixel focal plane array for the Green Bank Telescope

Author

Devaraj, Kiruthika, primary, Church, Sarah, additional, Cleary, Kieran, additional, Frayer, David, additional, Gawande, Rohit, additional, Goldsmith, Paul, additional, Gundersen, Joshua, additional, Harris, Andrew, additional, Kangaslahti, Pekka, additional, Readhead, Anthony, additional, Reeves, Rodrigo, additional, Samoska, Lorene, additional, Sieth, Matt, additional, and Voll, Patricia, additional

Published
2014
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168. On-wafer measurements of S-MMIC amplifiers from 400–500 GHz

Author

Samoska, Lorene, Fung, Andy, Pukala, David, Kangaslahti, Pekka, Lai, Richard, Sarkozy, Stephen, Mei, X. B., Boll, Greg, Samoska, Lorene, Fung, Andy, Pukala, David, Kangaslahti, Pekka, Lai, Richard, Sarkozy, Stephen, Mei, X. B., and Boll, Greg

Abstract

In this paper, we describe the design, simulation, and on-wafer measurements of Submillimeter-wave Monolithic Integrated Circuit (S-MMIC) amplifiers having gain in the 400-500 GHz range. A single-stage amplifier and two three-stage amplifiers with similar topology are presented, and have been fabricated in Northrop Grumman Corporation's (NGC) 35-nm InP high electron mobility transistor (HEMT) process. The circuits were fabricated using different indium channel compositions on different wafers, and comparison of the results based on the indium content will be presented. We have performed on-wafer S-parameter calibration and measurements using newly developed WR2.2 waveguide wafer probes from 325-508 GHz. We measured approximately 5 dB of gain for the single stage amplifier at 437 GHz, and approximately 10 dB of gain at 474 GHz for a three-stage amplifier, with over 9 dB of gain at 490 GHz.

Published
2011

169. Cryogenic MMIC Low Noise Amplifiers for W-Band and Beyond

Author

Samoska, Lorene A., Church, Sarah, Cleary, Kieran, Fung, Andy, Gaier, Todd C., Kangaslahti, Pekka, Lai, Richard, Lau, Judy M., Mei, Gerry, Reeves, Rodrigo, Sieth, Matthew M., Voll, Patricia, Samoska, Lorene A., Church, Sarah, Cleary, Kieran, Fung, Andy, Gaier, Todd C., Kangaslahti, Pekka, Lai, Richard, Lau, Judy M., Mei, Gerry, Reeves, Rodrigo, Sieth, Matthew M., and Voll, Patricia

Abstract

We discuss results of low noise amplifier Monolithic Millimeter-wave Integrated Circuits (MMICs), which were designed for specific frequencies in the range of 70-200 GHz. We report on room temperature and cryogenic noise performance for a variety of circuits. The designs utilize Northrop Grumman Corporation’s (NGC) 35 nm gate length InP HEMT technology. Some of the lowest reported noise figures to date have been observed with this process at cryogenic temperatures.

Published
2011

170. Development of MMIC receivers for cosmic microwave background interferometry

Author

Holland, Wayne S., Zmuidzinas, Jonas, Sieth, Matthew, Lau, Judy M., Voll, Patricia, Church, Sarah, Kangaslahti, Pekka, Samoska, Lorene, Soria, Mary, Gaier, Todd, Van Winkle, Dan, Neilson, Jeffrey, Tantawi, Sami, Cleary, Kieran, Readhead, Anthony C. S., Holland, Wayne S., Zmuidzinas, Jonas, Sieth, Matthew, Lau, Judy M., Voll, Patricia, Church, Sarah, Kangaslahti, Pekka, Samoska, Lorene, Soria, Mary, Gaier, Todd, Van Winkle, Dan, Neilson, Jeffrey, Tantawi, Sami, Cleary, Kieran, and Readhead, Anthony C. S.

Abstract

We report on the development of some of the key technologies that will be needed for a large-format Cosmic Microwave Background (CMB) interferometer with many hundreds of wideband W-band (75-110 GHz) receivers. A scalable threebaseline prototype interferometer is being assembled as a technology demonstration for a future ground- or space-based instrument. Each of the prototype heterodyne receivers integrates two InPMonolithic Microwave Integrated Circuit (MMIC) low-noise amplifiers, a coupled-line bandpass filter, a subharmonic balanced diode mixer, and a 90° local oscillator phase switch into a single compact module that is suitable for mass production. Room temperature measurements indicate bandaveraged receiver noise temperatures of 500 K from 85-100 GHz. Cryogenic receiver noise temperatures are expected to be around 50 K.

Published
2010

173. A 75–116-GHz LNA with 23-K noise temperature at 108 GHz

Author

Varonen, Mikko, primary, Reeves, Rodrigo, additional, Kangaslahti, Pekka, additional, Samoska, Lorene, additional, Akgiray, Ahmed, additional, Cleary, Kieran, additional, Gawande, Rohit, additional, Fung, Andy, additional, Gaier, Todd, additional, Weinreb, Sander, additional, Readhead, Anthony C. S., additional, Lawrence, Charles, additional, Sarkozy, Stephen, additional, and Lai, Richard, additional

Published
2013
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174. Planar Polarimetry Receivers for Large Imaging Arrays at Q-band

Author

Kangaslahti, Pekka, Gaier, Todd, Seiffert, Michael, Weinreb, Sander, Harding, Dennis, Dawson, Douglas, Soria, Mary, Lawrence, Charles, Hooberman, Benjamin, Miller, Amber, Kangaslahti, Pekka, Gaier, Todd, Seiffert, Michael, Weinreb, Sander, Harding, Dennis, Dawson, Douglas, Soria, Mary, Lawrence, Charles, Hooberman, Benjamin, and Miller, Amber

Abstract

The characterization of the intensity fluctuations of the cosmic microwave background (CMB) will be followed by the mapping of the polarization fluctuations of the CMB. Measurement of the polarization fluctuations requires highly sensitive instruments that are only possible by increasing the number of receivers. We are developing a large receiver array for the Q, U imaging experiment (QUIET) by building individual receivers that have noise temperatures close to the physical limit and that are simple, and low cost to build and operate. We developed these planar polarimetry receivers for Q-band by designing InP MMIC amplifiers with noise below 20 K, low loss and highly balanced phase switches and an entirely planar hybrid thin film circuit for the detection of the Stokes parameters Q and U. Our receivers achieve 25 K noise temperature over 8 GHz bandwidth and provide the I, Q and U parameters simultaneously. These planar modules have a simple plug in architecture that enables automated production of a large number of receivers and simple integration of large arrays of receivers.

Published
2006

175. Millimeter-wave array receivers for remote sensing

Author

Valinia, Azita, Uratsuka, Seiho, Misra, Tapan, Gaier, Todd, Kangaslahti, Pekka, Tanner, Alan, Lambrigtsen, Bjorn, Brown, Shannon, Seiffert, Michael, Dawson, Douglas, Weinreb, Sander, Wilson, William J., Lim, Boon, Ruf, Christofer, Piepmeier, Jeffrey, Valinia, Azita, Uratsuka, Seiho, Misra, Tapan, Gaier, Todd, Kangaslahti, Pekka, Tanner, Alan, Lambrigtsen, Bjorn, Brown, Shannon, Seiffert, Michael, Dawson, Douglas, Weinreb, Sander, Wilson, William J., Lim, Boon, Ruf, Christofer, and Piepmeier, Jeffrey

Abstract

Recent developments in millimeter-wave receiver have enabled new remote sensing capabilities. MMIC circuits operating at frequencies as high as 200 GHz have enabled low-cost mass producible integrated receivers suitable for array applications. We will describe several ground-based demonstrations of this technology including development of integrated spectral line receivers for atmospheric remote sensing, a synthetic thinned aperture radiometer for atmospheric sounding and imaging and polarimetric array radiometers for astrophysics applications.

Published
2006

177. InP HEMT low-noise amplifier-based millimeter-wave radiometers from 90 to 180 GHz with internal calibration for remote sensing of atmospheric wet-path delay

Author

Reising, Steven C., primary, Kangaslahti, Pekka, additional, Brown, Shannon T., additional, Dawson, Douglas E., additional, Lee, Alexander, additional, Albers, Darrin, additional, Montes, Oliver, additional, Gaier, Todd C., additional, Hoppe, Daniel J., additional, and Khayatian, Behrouz, additional

Published
2012
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178. Low noise amplifier receivers for millimeter wave atmospheric remote sensing

Author

Kangaslahti, Pekka, primary, Lim, Boon, additional, Gaier, Todd, additional, Tanner, Alan, additional, Varonen, Mikko, additional, Samoska, Lorene, additional, Brown, Shannon, additional, Lambrigtsen, Bjorn, additional, Reising, Steven, additional, Tanabe, Jordan, additional, Montes, Oliver, additional, Dawson, Douglas, additional, and Parashare, Chaitali, additional

Published
2012
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179. Technology developments for a large-format heterodyne MMIC array at W-band

Author

Sieth, Matthew, primary, Church, Sarah, additional, Lau, Judy M., additional, Voll, Patricia, additional, Gaier, Todd, additional, Kangaslahti, Pekka, additional, Samoska, Lorene, additional, Soria, Mary, additional, Cleary, Kieran, additional, Gawande, Rohit, additional, Readhead, Anthony C.S., additional, Reeves, Rodrigo, additional, Harris, Andrew, additional, Neilson, Jeffrey, additional, Tantawi, Sami, additional, and Van Winkle, Dan, additional

Published
2012
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181. On-Wafer S-Parameter Measurements in the 325–508 GHz Band

Author

Fung, Andy, primary, Samoska, Lorene, additional, Pukala, David, additional, Dawson, Douglas, additional, Kangaslahti, Pekka, additional, Varonen, Mikko, additional, Gaier, Todd, additional, Lawrence, Charles, additional, Boll, Greg, additional, Lai, Richard, additional, and Mei, X. B., additional

Published
2012
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182. Low Noise Amplifiers for 94 GHz Cloud Radar

Author

Kärkkäinen, Mikko, Varonen, Mikko, Kantanen, Mikko, Karttaavi, Timo, Kangaslahti, Pekka, Kärkkäinen, Mikko, Varonen, Mikko, Kantanen, Mikko, Karttaavi, Timo, and Kangaslahti, Pekka

Abstract

Four low noise amplifiers for 94 GHz cloud radar are presented. One LNA is designed using coplanar waveguides and the others use microstrip lines. The designed amplifiers were manufactured with a metamorphic high electron mobility transistor (MHEMT) technology and the chip size is 2.1 mm x 1.1 mm. The four stage LNAs have either 2x25 µm or 4x25 µm size MHEMTs. The scattering parameters and the noise figures of the amplifiers were measured at W-band and the results are presented. The best measured gain at 94 GHz was 16 dB and the noise figure 5.7 dB using a 2.5 V supply voltage and a drain current of 15 mA per stage. Furthermore, one of the amplifiers was assembled in a package that has WR-10 waveguide interfaces. The packaged chip exhibited 10.8 dB of gain and the noise figure was 8 dB at 94 GHz.

Published
2004

184. Development of internally-calibrated, MMIC-based millimeter-wave radiometers to enable correction of wet-tropospheric delay for coastal zone altimetry

Author

Reising, Steven C., primary, Lee, Alexander, additional, Albers, Darrin, additional, Kangaslahti, Pekka, additional, Brown, Shannon T., additional, Dawson, Douglas E., additional, Gaier, Todd C., additional, Montes, Oliver, additional, Hoppe, Daniel J., additional, and Khayatian, Behrouz, additional

Published
2011
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185. GeoSTAR-II: A prototype water vapor imager/sounder for the PATH mission

Author

Gaier, Todd, primary, Lambrigtsen, Bjorn, additional, Kangaslahti, Pekka, additional, Lim, Boon, additional, Tanner, Alan, additional, Harding, Dennis, additional, Owen, Heather, additional, Soria, Mary, additional, O'Dwyer, Ian, additional, Ruf, Christopher, additional, Miller, Ryan, additional, Block, Bruce, additional, Flynn, Michael, additional, and Whitaker, Sterling, additional

Published
2011
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189. Development of MMIC receivers for cosmic microwave background interferometry

Author

Sieth, Matthew, primary, Lau, Judy M., additional, Voll, Patricia, additional, Church, Sarah, additional, Kangaslahti, Pekka, additional, Samoska, Lorene, additional, Soria, Mary, additional, Gaier, Todd, additional, Van Winkle, Dan, additional, Neilson, Jeffrey, additional, Tantawi, Sami, additional, Cleary, Kieran, additional, and Readhead, Anthony C. S., additional

Published
2010
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191. Miniature low noise G-band I-Q receiver

Author

Kangaslahti, Pekka, primary, Pukala, David, additional, Gaier, Todd, additional, Tanner, Alan, additional, O'Dwyer, Ian, additional, Lambrigtsen, Bjorn, additional, Mei, Xiaobing, additional, and Lai, Richard, additional

Published
2010
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193. Millimeter wave integrated power amplifier

Author

Kangaslahti, Pekka, Teknillinen korkeakoulu, Helsinki University of Technology, Sähkö- ja tietoliikennetekniikan osasto, Halonen, Kari, Varonen, Mikko, Kangaslahti, Pekka, Teknillinen korkeakoulu, Helsinki University of Technology, Sähkö- ja tietoliikennetekniikan osasto, Halonen, Kari, and Varonen, Mikko

Published
2002

196. Millimeter-wave MMIC arrays for the QUIET experiment

Author

Cleary, Kieran A., primary, Gaier, Todd C., additional, Seiffert, Michael D., additional, Kangaslahti, Pekka P., additional, Lawrence, Charles R., additional, Richards, Joseph L., additional, Xenos, Stephanie, additional, Soria, Mary M., additional, and Campbell, April, additional

Published
2008
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197. Integrated preamplifier for a millimeterwave receiver

Author

Kangaslahti, Pekka, Riska, Jan, Teknillinen korkeakoulu, Helsinki University of Technology, Sähkö- ja tietoliikennetekniikan osasto, Porra, Veikko, Kärkkäinen, Mikko Matias, Kangaslahti, Pekka, Riska, Jan, Teknillinen korkeakoulu, Helsinki University of Technology, Sähkö- ja tietoliikennetekniikan osasto, Porra, Veikko, and Kärkkäinen, Mikko Matias

Abstract

Lisääntyvä langattoman tiedonsiirtokapasiteetin tarve johtaa yhä korkeampien taajuuksien käyttöön. Langattoman laajakaistaisen tiedonsiirtojärjestelmän 60 GHz radioetupäätä varten suunniteltiin matalakohinaisia etuvahvistimia. Vahvistimen kohina ja lineaarisuus vaikuttaa koko vastaanottimen suorituskykyyn. Lisäksi erityistä huomiota kiinnitettiin etuvahvistimien stabiilisuuteen. Diplomityössä on suunniteltu kaksi 4-asteista etuvahvistinta, joista toisessa käytettiin koplanaarista siirtojohtoa ja toisessa mikroliuskaa. Simulointituloksia vertailtiin. Vahvistimien kohinaluku on alle 4 dB ja lineaarinen lähtöteho 8-9 dBm. Suunnittelua varten tehtiin Pospieszalskin mallin mukainen kohinaparametrimalli. Aiemmin toteutetun 3-asteisen etuvahvistimen s-parametrit ja kohinaluku mitattiin suoraan sirulta mittakärjillä ja aaltoputkiliitännöillä. Kohinamittauksissa tutkittiin kolmea eri tasajänniteasettelua ja niiden vaikutusta kohinan määrään sekä vahvistukseen. Mittauksista saatua tietoa hyödynnettiin 4-asteisten etuvahvistimien suunnittelussa. Diplomityö on osa Tekesin ETX-ohjelman LALAMO-projektia.

Published
2000

200. Millimeter-wave array receivers for remote sensing

Author

Gaier, Todd, primary, Kangaslahti, Pekka, additional, Tanner, Alan, additional, Lambrigtsen, Bjorn, additional, Brown, Shannon, additional, Seiffert, Michael, additional, Dawson, Douglas, additional, Weinreb, Sander, additional, Wilson, William J., additional, Lim, Boon, additional, Ruf, Christofer, additional, and Piepmeier, Jeffrey, additional

Published
2006
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