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Your search keyword '"Qiu, J.-X."' showing total 2 results
Start Over Author "Qiu, J.-X." Journal electronics letters (institution of engineering & technology)
2 results on '"Qiu, J.-X."'

1. Reflection-type continuously-tunable phase shifter using PZT thin-film capacitors.

Author

Judy, D. C., Qiu, J. X., Pulskamp, J. S., Polcawich, R. G., and Kaul, R.

Subjects
*SEMICONDUCTORS, *CAPACITORS, *DIELECTRIC devices, *WAVEGUIDES, *ELECTRONIC equipment
Abstract

The design, fabrication and performance of a reflection-type tunable phase shifter based on a lead zirconate titanate (PZT) thin-film process is presented. The phase shifter consists of a coplanar waveguide Lange coupler on high resistivity silicon (HRSi) and two ferroelectric PZT varactors. At 12 GHz, the varactors achieve a capacitance tuning range of 5.5 to 1 along with a phase shift of 86° with bias voltages in the range 0–26 V. Analysis of the losses due to the varactors and the rest of the phase shifter is also presented. [ABSTRACT FROM AUTHOR]

Published
2009
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2. Higher-order predistortion linearisation using cascaded lower-order nonlinearities.

Author

Qiu, J. X., Abe, D. K., Antonsen Jr., T. M., Danly, B. G., Levush, B., and Myers, R.

Subjects
*NONLINEAR theories, *ELECTRIC distortion, *ELECTRIC interference, *MATHEMATICAL analysis, *ELECTRIC currents, *OSCILLATIONS
Abstract

A technique for realising nonlinear functions of order a 5 using cascaded third-order nonlinear functions is described. The technique can be used to efficiently generate higher-order nonlinearities for predistortion linearisation applications. The use of two cascaded third-order functions is experimentally demonstrated to be comparable to a fifth-order implementation in performance. [ABSTRACT FROM AUTHOR]

Published
2004
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