H - Electricity – 03 – D
Patent
H - Electricity
03
D
329/15
H03D 3/00 (2006.01) H03G 3/20 (2006.01)
Patent
CA 1254958
ABSTRACT Apparatus for obtaining programmable threshold extension of an FM demodulator comprises a limiter preamplifier 4 and a variable gain buffer amplifier 6. The buffer amplifier 6 is provided with an external control node 16 such that the signal level fed from the buffer amplifier 6 to an injection locked oscillator/divider 8 can be programmed in dependence upon a control signal applied to the external control node 16. In this manner threshold extension of the FM demodulator can be selectively applied in dependence upon the noise level in an FM input signal to be demodulated. The limiter preamplifier 4 and the buffer amplifier 6 may form part of an automatic gain control circuit.
516424
Borden Ladner Gervais Llp
Mitel Semiconductor Limited
Plessey Overseas Limited
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