Two-pole, fixed-tuned monolithic crystal frequency discriminator

Details Two-pole, fixed-tuned monolithic crystal frequency discriminator Two-pole, fixed-tuned monolithic crystal frequency discriminator

1978-03-20

1980-06-10

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329205R, 333192, H03D 316

Patent

active

042075351

ABSTRACT:
A two-pole fixed-tuned monolithic crystal frequency discriminator circuit is provided wherein a tuned circuit is utilized connected between the center pin of the two-pole crystal device and ground. In this manner, two bandpass filters are effectively provided wherein the respective outputs thereof may be rectified and combined so as to obtain the desired audio output. The result is a two-pole discriminator device with the linear portion of the conventional "S" curve having a substantially wider response characteristic than for any heretofore known monolithic crystal discriminator. Additionally, it does not need further tuning adjustments and it exhibits substantially better temperature stability and small size as well as a cost saving in manufacture as compared to a comparable three-pole device.

REFERENCES:
patent: 2248776 (1941-07-01), Och
patent: 3487318 (1969-12-01), Herman
patent: 4006437 (1977-02-01), Simpson et al.

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