A 256mhz Analog Baseband Chain With Tunable Bandwidth And Gain For Uwb Receivers

Yuting Yao,Jipeng Wei,Manxin Li,Shunli Ma,Fan Ye,Junyan Ren

2019 IEEE 13TH INTERNATIONAL CONFERENCE ON ASIC (ASICON)（2019）

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摘要

A 256MHz analog baseband chain is implemented in 1.2 V 65nm CMOS process. The baseband chain is composed of one fifth-order type I Chebyshev low-pass filter (LPF) and two variable gain amplifiers (VGA) for Ultra wideband (UWB) applications. The LPF is realized in Gm-C topology for channel selection. AC coupling capacitor and series divider resistors are used to prevent dc-offset and set a suitable common mode voltage. To achieve wide bandwidth and high linearity, an amplifier with enhanced source degeneration is employed in VGA design. Simulation results show that the baseband chain can realize a variable -3dB bandwidth range from 151MHz to 256 MHz with 15MHz step, and the gain range can vary from 20dB to 38dB with 3 dB step. For the overall chain the noise figure (NF) is 11dB at 38dB gain, while the input-referred noise (IRN) is 2.5 nV/root Hz.

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关键词

analog baseband chain,CMOS process,variable gain amplifiers,series divider resistors,one fifth-order type I Chebyshev LPF,one fifth-order type I Chebyshev low-pass filter,Gm-C topology,VGA design,ultrawideband applications,UWB receivers,frequency 15.0 MHz,frequency 151.0 MHz to 256.0 MHz,voltage 1.2 V

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