Low phase noise frequency multiplier

Details Low phase noise frequency multiplier Low phase noise frequency multiplier

1990-11-07

1991-12-31

Heyman, John S.

Wave transmission lines and networks

Frequency multipliers

3072191, 328 15, 328 23, H03B 1900, H03H 701

Patent

active

050775464

ABSTRACT:
A low phase noise frequency multiplier is disclosed for multiplying a sine wave obtained from a low phase noise crystal oscillator to higher frequencies than can be directly obtained from a crystal oscillator. The multiplication occurs without the ordinary increase in phase noise. The multiplier, when tripling the frequency contains a low phase noise frequency doubler. The double and triple frequency terms in the tripler are synthesized from two orthogonally related derivatives of the same wave, which are then multiplied in a double balanced mixer. The process reinforces the desired harmonics while not reinforcing the short term random phase noise, and produces a substantial improvement in the single sideband phase noise ratio over conventional frequency multipliers.

REFERENCES:
patent: 3487290 (1969-12-01), Johnston
patent: 4327343 (1982-04-01), Cornish
patent: 4531105 (1985-07-01), Kumar
patent: 4684833 (1987-08-01), Rinderle
patent: 4947062 (1990-08-01), Weiner et al.

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