Title :
A 2-V CMOS 455 kHz FM/FSK demodulator using feedforward offset cancellation limiting amplifier
Author :
Huang, Po-Chiun ; Chen, Yi-Huei ; Chien-Chih Liu ; Wang, Chorng-Kuang
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
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 maximum ±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; demodulators; feedforward; frequency shift keying; low-power electronics; phase detectors; 0.6 micron; 2 V; 2.3 mW; 455 kHz; CMOS; FM/FSK demodulator; IF signal processor; active area; demodulation constant; external tank phase shifter; feedforward offset cancellation limiting amplifier; frequency deviation; low-power electronics; on-chip feedforward offset cancellation circuit; on-chip phase detector; quadrature detector; Bandwidth; CMOS technology; Circuits; Cutoff frequency; Demodulation; Detectors; Frequency modulation; Frequency shift keying; Signal processing; Voltage;
Conference_Titel :
ASICs, 2000. AP-ASIC 2000. Proceedings of the Second IEEE Asia Pacific Conference on
Conference_Location :
Cheju
Print_ISBN :
0-7803-6470-8
DOI :
10.1109/APASIC.2000.896932
