Title :
A direct-conversion receiver for 900 MHz (ISM band) spread-spectrum digital cordless telephone
Author :
Hull, Christopher Dennis ; Tham, Joo Leong ; Chu, Robert Ray
Author_Institution :
Rockwell Int. Corp., Newport Beach, CA, USA
fDate :
12/1/1996 12:00:00 AM
Abstract :
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
Keywords :
UHF integrated circuits; UHF mixers; UHF phase shifters; cordless telephone systems; digital radio; mobile radio; radio receivers; spread spectrum communication; 105 dB; 2.7 to 5 V; 200 mus; 25 GHz; 50 mA; 900 MHz; ISM band; Si; channel selectivity; class-AB servo amplifier; direct-conversion receiver; gain-control range; industrial-scientific-medical band; integrated quadrature mixers; phase error; phase-shift networks; spread-spectrum digital cordless telephone; turn-on time; Application specific integrated circuits; Baseband; Low pass filters; Low-noise amplifiers; Radio frequency; Spread spectrum communication; Synthesizers; Telephony; Transceivers; Transmitters;
Journal_Title :
Solid-State Circuits, IEEE Journal of
