FM demodulator integrated on semiconductor chip without discrete

Details FM demodulator integrated on semiconductor chip without discrete FM demodulator integrated on semiconductor chip without discrete

1996-05-31

1997-11-11

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Having specific distortion, noise or other interference...

329325, 329326, 331113R, 455214, 348726, H03D 302, H03D 328

Patent

active

056868626

ABSTRACT:
An FM demodulator formed on a semiconductor chip generates a demodulated audio-frequency signal from an audio intermediate frequency signal through a phase locked loop constituted by a multiplier, a low-pass filter and a voltage-controlled oscillator. A variation of amplitude of the demodulated audio-frequency signal due to a temperature variation is compensated by a temperature compensating amplifier and a de-emphasis filter through first and second reference currents flowing out therefrom through an internal resistor fabricated on the same semiconductor chip and an external resistor.

REFERENCES:
patent: 4479091 (1984-10-01), Yoshisato
patent: 4881042 (1989-11-01), Min et al.

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