H-F Portion of TV receiver

Details H-F Portion of TV receiver H-F Portion of TV receiver

1980-05-12

1982-01-26

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455338, 333 24R, H04B 126

Patent

active

043132227

ABSTRACT:
The output electrode of a field effect transistor of a high-frequency input stage is connected to a capacitively coupled input (gate) electrode of the field effect transistor of a mixer stage through one of a pair of bifilarly wound coils provided on a ferrite core, while the second of these coils connects the same input of the mixer stage to the output of a local oscillator in such a way that two signal paths leading towards the mixer stage, respectively for the high-frequency signal and the oscillator signal, go through coupled coils in opposite winding directions. The result is that the path for signals in either direction between the local oscillator and the input stage are of much higher impedance than the paths for signals proceeding to the mixer stage respectively from the input stage and from the local oscillator.

REFERENCES:
patent: 2654836 (1953-10-01), Beck
patent: 3226665 (1965-12-01), Luna
patent: 3299384 (1967-01-01), Lee
patent: 4207544 (1980-06-01), Klostermark

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