A fast-settling wideband-IF ASK baseband circuit for a wireless endoscope capsule

Authors:
Baoyong Chi;Jinke Yao;Patrick Chiang;Zhihua Wang
Affiliations:
Institute of Microelectronics, Tsinghua University, Beijing, China;Department of Electronic Engineering, Tsinghua University, Beijing, China;School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR;Institute of Microelectronics, Tsinghua University, Beijing, China
Venue:
IEEE Transactions on Circuits and Systems II: Express Briefs
Year:
2009

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Abstract

A novel automatic-gain-control (AGC) architecture utilizing wideband current feedback is proposed for the baseband circuit of a wireless endoscope capsule. The baseband circuit consists of a fast-settling wideband AGC loop and an amplitude-shift-keying demodulator. Additional integrators in the reverse signal path provide negative feedback, bandpass-filtering effect, attenuating low-frequency noises, and dc offset from the radio-frequency front end. The baseband circuit fabricated in a 180-nm complementary metal-oxide-semiconductor process achieves a wide-intermediate-frequency (IF) carrier frequency in the range of 0.5-40 MHz, a measured settling time of 2 µs, and an input sensitivity of -57 dBm. The entire baseband demodulator dissipates only 5 mA, with a 1.8-V supply at a data rate of 1.37 Mb/s and an IF carrier frequency of 10 MHz.