Frequency synthesis using a remodulator

Details Frequency synthesis using a remodulator Frequency synthesis using a remodulator

1997-06-09

1998-10-13

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

327113, 327551, 327161, 327153, 375200, H04L 2730, H03L 716

Patent

active

058217827

ABSTRACT:
Noise is input to a frequency generation circuit which includes a demodulator stage with a multiplier circuit in which the noise is multiplied by means of a feedback signal. The result of the multiplication in the demodulator stage is passed through a low pass filter. In a modulation wipe-off stage of the frequency generation circuit, the sign of the filtered multiplier output is extracted using a comparator circuit. The comparator circuit output is passed to a correlator circuit. In the correlator circuit, the comparator circuit output multiplies a delayed version of the input noise which is provided by a delay circuit element. The correlator circuit generates quadrature signals. Summation of the quadrature signals followed by bandpass filtering and amplitude limiting yields a discrete synthesized frequency signal.

REFERENCES:
patent: 5235612 (1993-08-01), Stilwell et al.

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