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A 2-V CMOS 455-kHz FM/FSK demodulator using feedforward offset cancellation limiting amplifier

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3 Author(s)
Po-Chiun Huang ; Div. of Circuit Design Eng., MediaTek Inc., Hsinchu, Taiwan ; Yi-Huei Chen ; Chorng-Kuang Wang

This paper presents a low-voltage low-power IF 455-kHz signal processor that contains a three-stage limiting amplifier and an FM/FSK demodulator. The limiting amplifier uses an on-chip feedforward offset cancellation circuit. The FM/FSK demodulator employs a quadrature detector that is composed of an on-chip phase detector and an external tank phase shifter. The demodulation constant is 20 mV/kHz with masimum ±10-kHz frequency deviation. The IF signal processor that consumes 2.3 mW from a single 2-V power supply demonstrates a high sensitivity of -72 dBm. It occupies an active area of 0.2 mm2 using 0.6-μm digital CMOS technology

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:36 ,  Issue: 1 )

Date of Publication:

Jan 2001

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