Title :
A 2-V CMOS 455-kHz FM/FSK demodulator using feedforward offset cancellation limiting amplifier
Author :
Huang, Po-Chiun ; Chen, Yi-Huei ; Wang, Chorng-Kuang
Author_Institution :
Div. of Circuit Design Eng., MediaTek Inc., Hsinchu, Taiwan
fDate :
1/1/2001 12:00:00 AM
Abstract :
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
Keywords :
CMOS analogue integrated circuits; analogue processing circuits; demodulators; feedforward; frequency modulation; frequency shift keying; intermediate-frequency amplifiers; limiters; low-power electronics; radio receivers; 0.6 micron; 2 V; 2.3 mW; 455 kHz; CMOS FM/FSK demodulator; external tank phase shifter; feedforward limiting amplifier; low-power IF signal processor; low-voltage IF signal processor; offset cancellation limiting amplifier; onchip cancellation circuit; onchip phase detector; quadrature detector; three-stage limiting amplifier; Automatic control; CMOS technology; Communication system control; Demodulation; Detectors; Frequency shift keying; Integrated circuit technology; Limiting; Phase detection; Signal processing;
Journal_Title :
Solid-State Circuits, IEEE Journal of
