Frequency conversion circuit

Details Frequency conversion circuit Frequency conversion circuit

1982-04-23

1983-10-25

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455332, 455333, 332 43B, H04B 126

Patent

active

044123523

ABSTRACT:
A circuit arrangement for converting high frequencies to intermediate frequencies by mixing with a heterodyne frequency, wherein the high frequency signal input is connected to the signal output of the circuit arrangement via the primary winding of a polarity reversing transformer which is controlled such that the high frequency input signal appears at the signal output, alternatingly once directly and once with reversed polarity in the rhythm of the heterodyne frequency, and thus the high frequency signal is mixed with the heterodyne frequency. The polarity reversal is controlled by alternatingly opening and short-circuiting the secondary winding of the polarity reversing transformer in push-pull with the center tap of the primary winding by means of electronic switching circuits responsive to the heterodyne frequency.

REFERENCES:
patent: 3614668 (1971-10-01), Sudoh
patent: 3986146 (1976-10-01), Parkhideh et al.
patent: 4317230 (1982-02-01), Boubouleix
Henkler, Anwendung der Modulation beim Tragerfrequensfernsprechen auf Leitungen, 1948, pp. 22-39.
Rohde et al., "Stand des Technik bei Amateurfundgeraten in Kurzwellengebiet", Funkschau, 1972, No. 24, pp. 885-888.

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