Ultra low noise crystal oscillator circuit

Details Ultra low noise crystal oscillator circuit Ultra low noise crystal oscillator circuit

1990-11-01

1991-11-05

Grimm, Siegried H.

Oscillators

Single oscillator with plural output circuits

331 70, 331116R, 331158, H03B 536

Patent

active

050633589

ABSTRACT:
An ultra low noise oscillator circuit including a crystal and having two outputs. At the two outputs, the signal is correlated and the noise outside of the crystal bandwidth is decorrelated. Summing the two outputs in a hybrid circuit significantly reduces oscillator phase noise by almost 3 dB. In addition, these outputs can be used to perform a single oscillator noise test on the oscillator or crystal.

REFERENCES:
patent: 4160183 (1979-07-01), Kusters et al.
patent: 4859969 (1989-08-01), Malinowski et al.

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