Mixer circuit for use in a tuner of a television set or the like

Details Mixer circuit for use in a tuner of a television set or the like Mixer circuit for use in a tuner of a television set or the like

1988-06-07

1990-03-27

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

307529, H04B 128

Patent

active

049125206

ABSTRACT:
Disclosed is a mixer circuit which employs four FET's in a manner so that a source electrode of a first FET and a source electrode of a second FET are connected to a first terminal, a source electrode of a third FET and a source electrode of a fourth FET are connected to a second terminal, a first impedance circuit is connected between the first terminal and the earth, a second impedance circuit is connected between the second terminal and the earth, a first high frequency input terminal is connected through a first switching circuit to a junction between the first impedance circuit and the first terminal, a second high frequency input terminal is connected through a second switching circuit to a junction between the second impedance circuit and the second terminal, a gate electrode of the first FET and a gate electrode of the fourth FET are connected to a third terminal, a gate electrode of the second FET and a gate electrode of the third FET are connected to a fourth terminal, a drain electrode of the first FET and a drain electrode of the third FET are connected to a fifth terminal, a drain electrode of the second FET and a drain electrode of the fourth FET are connected to a sixth terminal, and an electric source supply circuit is connected to the fifth and sixth terminals. Phase-reversed local oscillation signals are fed to the third and fourth terminals.

REFERENCES:
patent: 4058771 (1977-11-01), Ohsawa et al.
patent: 4216431 (1980-08-01), Shibata et al.
patent: 4268916 (1981-05-01), Kusakabe
patent: 4413239 (1983-11-01), Romeo et al.
patent: 4461042 (1984-07-01), Tanabe et al.
patent: 4546275 (1985-10-01), Pena-Finol et al.
patent: 4633188 (1986-12-01), Matsuta
patent: 4636663 (1987-01-01), Jongepier et al.
patent: 4694204 (1987-09-01), Nishijima et al.

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