Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1996-02-07
1997-12-09
Faile, Andrew
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455333, 327113, 327124, 327327, H04B 126
Patent
active
056970919
ABSTRACT:
An AM-modulated carrier signal is converted to a lower carrier frequency through mixing with a square wave local oscillator signal. A field-effect transistor chops the modulated signal according to the square wave signal so that a chopped or sampled version of the modulated signal is created without passing the signal through a semiconductor junction. A filter then selects the desired mixing product. Thus, a distortion free mixing of the signal is obtained using low cost components including a JFET switch and a square wave output from a microcontroller.
REFERENCES:
patent: 4525871 (1985-07-01), Foyt et al.
NE612 Double-Balanced Mixer and Oscillator, Product Specification, Nov. 3, 1987, pp. 163-168.
Harris Richard Bruce
Hirschenberger Frank Michael
Whitecar John Elliott
Faile Andrew
Ford Motor Company
Mollon Mark
Onuaku Christopher D.
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