Transistor mixer and amplifier input stage

Details Transistor mixer and amplifier input stage Transistor mixer and amplifier input stage

1982-09-10

1984-10-30

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455253, 455332, 332 43B, H04B 126

Patent

active

044803370

ABSTRACT:
A transistor mixer and amplifier input stage which includes a mixer and a differential amplifier whose gain is controlled by a voltage generated by an AGC circuit. Two transistors, each having a resistor connected in series with its emitter, are connected between the inputs of the differential amplifier and the mixer. When the level of the input signal increases beyond a given level, the two transistors begin to conduct, thereby shunting the differential amplifier.

REFERENCES:
patent: 3579114 (1971-05-01), Kozawa
patent: 4058771 (1977-11-01), Ohsawa et al.
patent: 4216431 (1980-08-01), Shibata et al.
patent: 4268916 (1981-05-01), Kusakabe
patent: 4313221 (1982-01-01), Mattfeld
patent: 4344188 (1982-08-01), Tanabe et al.
IEEE Transactions on Consumer Electronics, vol. CE-26, Aug. 1980, pp. 271-281.

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