Low noise multiple crystal-controlled oscillator

Details Low noise multiple crystal-controlled oscillator Low noise multiple crystal-controlled oscillator

1984-08-29

1986-02-11

Grimm, Siegfried H.

Oscillators

Plural oscillators

Parallel connected

331116R, 331162, H03B 536

Patent

active

045701326

ABSTRACT:
An oscillator circuit utilizing multiple (two) quartz crystal resonators as the frequency controlling elements in a novel circuit arrangement. The use of two crystal units increases the oscillator circuit signal transmission group delay by a factor of 2 to 3 and effects an estimated 6 dB reduction in oscillator output signal phase noise sideband level at carrier offset frequencies less than the resonator half-bandwidths. The degree of resonator tracking required is made practical with the use of temperature controlled SC-cut resonators. In addition, the oscillator circuit is configured so that equal, correlated output signal currents can be extracted from each resonator through individual load circuits, thereby increasing available oscillator output signal amplitude by 2:1 and reducing the net effect of uncorrelated load circuit additive noise by 3 dB.

REFERENCES:
patent: 3210685 (1965-10-01), Zepp
patent: 3366893 (1968-01-01), Brunins
patent: 3381239 (1968-04-01), Lehman
patent: 3401354 (1968-09-01), Seidel
patent: 3836873 (1974-09-01), Healey et al.
patent: 4107625 (1978-08-01), Courier de Mere

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