High frequency broad-band mixing circuit including an electrolyt

Details High frequency broad-band mixing circuit including an electrolyt High frequency broad-band mixing circuit including an electrolyt

1990-08-22

1991-12-17

Olms, Douglas W.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455326, 455317, 455318, H04B 126

Patent

active

050739778

ABSTRACT:
A broad-band mixing circuit comprises a transmission line transformer connected between a port adapted to receive a radio frequency signal and a double balanced mixing section, the transformer serving to convert an unbalanced radio frequency signal into a balanced signal, a transmission line transformer connected between a local oscillation signal port and the mixing section, the transformer serving to convert an unbalanced local oscillation signal into a balanced signal, and a transmission line transformer connected between the mixing section and an intermediate frequency signal port, the transformer serving to convert the balanced signal from the mixing section into an unbalanced signal. The noise figure is improved by connecting an electrolytic capacitor in parallel with the balanced output end or the input end of the transmission line transformer for the local oscillation signal.

REFERENCES:
patent: 3913037 (1975-10-01), Himono et al.
patent: 4193048 (1980-03-01), Nyhus
patent: 4449245 (1984-05-01), Rabe
patent: 4601063 (1986-07-01), Price
patent: 4677691 (1987-06-01), Scott
patent: 4677692 (1987-06-01), Sakashita et al.
patent: 4979233 (1990-12-01), Kawahata

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