Journal
IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS
Volume 26, Issue 6, Pages 1192-1203Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVLSI.2018.2803525
Keywords
Bandpass filters; finite impulse response (FIR) filters; matched filters; pulse-doppler radar; radar; widely programmable filters
Funding
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA0003525]
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A configurable-bandwidth (BW) filter is presented in this paper for pulsed radar applications. To eliminate dispersion effects in the received waveform, a finite impulse response (FIR) topology is proposed, which has a measured standard deviation of an in-band group delay of 11 ns that is primarily dominated by the inherent, fully predictable delay introduced by the sample-and-hold. The filter operates at an IF of 20 MHz, and is tunable in BW from 1.5 to 15 MHz, which makes it optimal to be used with varying pulse widths in the radar. Employing a total of 128 taps, the FIR filter provides greater than 50-dB sharp attenuation in the stopband in order to minimize all out-of-band noise in the low signal-to-noise received radar signal. Fabricated in a 0.18-mu m silicon on insulator CMOS process, the proposed filter consumes approximately 3.5 mW/tap with a 1.8-V supply. A 20-MHz two-tone measurement with 200-kHz tone separation shows IIP3 greater than 8.5 dBm.
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