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Your search keyword '"Rad, Reza E."' showing total 23 results
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23 results on '"Rad, Reza E."'

2. A 5.8 GHz 1.8 V +20 dBm 32.5% PAE Power Amplifier for a Short-Range Over-the-Air WPT Application.

Author

Kim, Myonggwan, Rad, Reza E., Kim, Sungjin, Pu, Younggun, Jung, Yeonjae, Huh, Hyungki, Yoo, Joonmo, Kim, Seokkee, and Lee, Kangyoon

Subjects
*WIRELESS power transmission, *POWER amplifiers, *COMPLEMENTARY metal oxide semiconductors, *ANTENNA arrays, *QUALITY factor, *INTERNET of things
Abstract

This paper presents a 5.8 GHz differential cascode power amplifier for an over-the-air wireless power transfer application. Over-the-air wireless power transfer provides a variety of benefits in several applications such as the Internet of Things and medical implantation applications. The proposed PA features two fully differentially active stages with a custom-designed transformer to provide a single-ended output. The custom-made transformer shows a high quality factor, as high as 11.6 and 11.2 for the primary and secondary sides at 5.8 GHz. Fabricated using a standard 180 nm CMOS process, the amplifier achieves input and output matching of −14.7 dB and −29.7 dB, respectively. To achieve a high power level and efficiency, accurate optimization through power matching, Power Added Efficiency (PAE), and the design of the transformer are carried out while the supply voltage is limited to 1.8 V. Measurement results show a 20 dBm output power with a PAE as high as 32.5%, which makes the PA suitable for application, and it can be implanted while arrayed with various antenna arrays. Finally, a FOM is introduced to compare the performance of the work with similar works in the literature. [ABSTRACT FROM AUTHOR]

Published
2023
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8. A Wideband Multi-Level Reconfigurable Class E/F23 Power Amplifier with A Band-Selecting Tracking Reactance Compensation Automatic Calibration Algorithm

Author

Rad, Reza E., primary, Qaragoez, Yasser M., additional, Kim, SungJin, additional, Hejazi, Arash, additional, Kim, Dong Gyu, additional, Khan, Danial, additional, Ali, Imran, additional, Rikan, Behnam S., additional, Yoo, Sang-Sun, additional, Pu, YoungGun, additional, Hwang, Keum Cheol, additional, Yang, Youngoo, additional, and Lee, Kang-Yoon, additional

Published
2022
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23. A 10- and 12-Bit Multi-Channel Hybrid Type Successive Approximation Register Analog-to-Digital Converter for Wireless Power Transfer System.

Author

Rikan, Behnam Samadpoor, Kim, Sang-Yun, Abbasizadeh, Hamed, Hejazi, Arash, Rad, Reza E., Shehzad, Khuram, Hwang, Keum Cheol, Yang, Youngoo, Lee, Minjae, and Lee, Kang-Yoon

Subjects
ANALOG-to-digital converter design & construction, WIRELESS power transmission, ELECTRIC power transmission, CAPACITORS, SUCCESSIVE approximation analog-to-digital converters
Abstract

This paper presents a successive approximation register (SAR) analog-to-digital converter (ADC) designed for a wireless power transfer system. This is a four–channel SAR ADC structure with 10-bit resolution for each channel, which can also be applied as a single 12-bit ADC. To reduce the area and the number of the required devices in the ADC module, a hybrid-type structure with capacitor and resistor DACs is applied, in which the resistor DAC is shared between channels and determines the seven least significant bits (LSB)s, while the capacitor DAC determines the three most significant bits (MSBs). For the 12-bit operation mode, and to reduce the number of capacitors required in the capacitor DAC, the capacitors of the four channels are shared to determine the five MSBs. A foreground calibration is applied to the capacitor DAC to remedy the gain and offset errors after fabrication. An additional low resistive path is also implemented in the resistor DAC for error correction. The conversion speed for 10- and 12-bit operations reaches up to 1 and 0.5 MS/s, respectively. The prototype ADC is designed in a 180 nm complementary metal-oxide semiconductor (CMOS) process. For 10- and 12-bit operating modes, this ADC module achieves up to 9.71 and 11.76 effective number of bits (ENOBs), respectively. [ABSTRACT FROM AUTHOR]

Published
2018
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