FM detector using switched capacitor circuits

Details FM detector using switched capacitor circuits FM detector using switched capacitor circuits

1989-08-29

1990-12-04

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Having specific distortion, noise or other interference...

307519, 328140, 329327, 329341, 375 82, 455214, H03D 300

Patent

active

049756532

ABSTRACT:
An integrated circuit FM detector which compensates for variations in semiconductor manufacturing process and temperature employs a pair of serially connected switched capacitor-operational amplifier combinations. The first combination is a frequency to voltage converter which uses a switched capacitor input circuit which is clocked at the frequency of the input signal, an operational amplifier and a feedback resistor. The second combination is a compensation circuit which uses an input resistor, a feedback switched capacitor circuit and an operational amplifier. The feedback switched capacitor circuit is clocked at a fixed rate. Reversal of the roles of the resistor and the switched capacitor in the first and second combinations compensates for both temperature and manufacturing process variations. The electrical separation of the input and feedback switched capacitor circuits helps to insure against the generation of unwanted noise in the form of beat frequencies which could be generated if the switched capacitor circuits were used as the input and feedback circuits of a single operational amplifier.

REFERENCES:
patent: 4704545 (1987-11-01), Tanaka et al.
patent: 4752704 (1988-06-01), Baccarani et al.
patent: 4783635 (1988-11-01), Sevastopoulos

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