A low power 200 MHz receiver for wireless hearing aid devices

Abstract

A low power receiver for a wireless hearing aid system working in the 174-223 MHz range has been implemented in a 0.8 /spl mu/m BiCMOS technology. The chip comprises LNA, RF-mixer, variable-gain IF-amplifier, and demodulator, which consists of digital phase-shifter and I/Q IF-mixers, 5th order Bessel filters, and DC-amplifiers. Merely 667 /spl mu/A including biasing is consumed for the reception of an 8-ary PSK signal with 336 kbit/s.