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A direct-conversion receiver for 900 MHz (ISM band) spread-spectrum digital cordless telephone

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3 Author(s)
C. D. Hull ; Rockwell Int. Corp., Newport Beach, CA, USA ; Joo Leong Tham ; R. R. Chu

A single chip direct-conversion receiver for use in the 900 MHz ISM (industrial-scientific-medical) band has been fabricated in a 25 GHz fT silicon-bipolar process. The receiver has a maximum gain of 105 dB with more than 80 dB of gain-control range. Integrated quadrature mixers and phase-shift networks are included. The typical phase error of the I/Q outputs is less than 1 degree. A class-AB servo amplifier is used to reduce dc offset while maintaining a turn-on time of 200 μs. An integrated filter is included to improve channel selectivity. The integrated circuit operates on a supply voltage range of 2.7 to 5.0 V and draws 50 mA of supply current

Published in:

IEEE Journal of Solid-State Circuits  (Volume:31 ,  Issue: 12 )