Wide frequency deviation voltage controlled crystal oscillator h

Details Wide frequency deviation voltage controlled crystal oscillator h Wide frequency deviation voltage controlled crystal oscillator h

1992-03-30

1993-07-20

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

358 19, 331162, 331177V, 333189, H03B 536, H03H 900, H04N 9455

Patent

active

052297357

ABSTRACT:
A wide frequency deviation voltage controlled crystal oscillator includes a multiple section bandpass filter containing a plurality of crystal or ceramic elements. One embodiment includes a plurality of crystals which are connected into parallel conduction paths. The crystals have resonant frequencies which are separated by small, selected intervals so that the oscillator may be adjusted to a wider range of frequencies than prior art oscillators. Alternatively, the same result may be achieved by using crystals with the same resonant frequency and connecting each crystal to a capacitor having a selected value. In another embodiment a multiple section crystal or ceramic bandpass filter is substituted for the parallel conduction paths. The principles of the invention are applicable to a number of different devices, including the ringing circuits used in color televisions to perpetuate the color bursts which appear in the blanking intervals of the incoming TV signals.

REFERENCES:
patent: 3170120 (1965-02-01), Jensen et al.
patent: 3358244 (1967-12-01), Ho et al.
patent: 4063194 (1977-12-01), Helle
patent: 4994764 (1991-02-01), Peters
Science Manual--Video Tape Recorder, IVC-900, International Video Corp., Feb. 1972, pp. 4-30.
Handbook of Filter Synthesis, A. I. Zverev, John Wiley & Sons, Inc., 1967, pp. 425, 426, 446, 452, 486-487.
"Survey of Crystal Oscillators", Roger Harrison, Ham Radio, Mar. 1976, pp. 10-22.

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