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

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

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 /spl plusmn/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 mm/sup 2/ using 0.6 /spl mu/m digital CMOS technology.

[1] Asad A. Abidi,et al. A 1 GHz CMOS RF front-end IC for a direct-conversion wireless receiver , 1996, IEEE J. Solid State Circuits.

[2] John Francis Wilson,et al. A single-chip VHF and UHF receiver for radio paging , 1991 .

[3] Asad A. Abidi. Direct-conversion radio transceivers for digital communications , 1995 .

[4] H. Kimura,et al. An instantaneous response CMOS optical receiver IC with wide dynamic range and extremely high sensitivity using feed-forward auto-bias adjustment , 1995 .

[5] Stefan Beyer,et al. A one-chip 2 GHz single superhet receiver for 2 Mb/s FSK radio communication , 1994, Proceedings of IEEE International Solid-State Circuits Conference - ISSCC '94.

[6] E. Klumperink,et al. AM suppression with low AM-PM conversion with the aid of a variable-gain amplifier , 1996 .