Frequency converter for varying the frequency of a local signal

Details Frequency converter for varying the frequency of a local signal Frequency converter for varying the frequency of a local signal

1993-02-24

1994-10-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

359191, H01J 4014

Patent

active

053528859

ABSTRACT:
An input signal of a frequency f.sub.0 is supplied to one end of a photodiode. Optical signals of frequencies F.sub.0 and F.sub.0 +.DELTA.F from two light sources are combined by a semitransparent mirror and the resulting interference light is applied to the photodiode. The interference light is converted by the photodiode to an electrical local signal of a frequency .DELTA.F. The electrical local signal and the input signal are frequency mixed in accordance with the nonlinear characteristic of the photodiode and an intermediate-frequency signal of a frequency corresponding to the frequency difference between them is provided at an output terminal.

REFERENCES:
patent: 4156135 (1979-05-01), Miller et al.
patent: 5140453 (1992-08-01), Tsushima et al.

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