Level control circuit for receiver

Details Level control circuit for receiver Level control circuit for receiver

1996-04-26

1998-05-26

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

4552481, 4552491, 330278, H03G 330

Patent

active

057582700

ABSTRACT:
An emitter of a transistor Q22 and a collector of a transistor Q23 are connected in series. The transistors Q22 and Q23 are of the same polarity. The transistor Q23 is connected to function as a diode for an alternating current. To the junction point between the emitter of the transistor Q22 and the collector of the transistor Q23, an input signal source 11 is connected and also a circuit 13 of the subsequent stage is connected. A transistor Q25 is supplied with a bias voltage equal to that of the transistor 21. A transistor Q28 detects a difference between a collector current of the transistor Q25 and a current having a reference level. The level of a collector current of the transistor Q22 is controlled by a level control signal. The detected output of the transistor 28 is supplied to the transistor 23 as a control signal for a collector current of the transistor 23. This structure places no constraints on the construction of subsequent stages of the circuitry.

REFERENCES:
patent: 3582681 (1971-06-01), Norman
patent: 3912946 (1975-10-01), Graziadei
patent: 4249137 (1981-02-01), Malchow
patent: 4704738 (1987-11-01), Graziadei et al.
patent: 4736166 (1988-04-01), Eckland et al.
patent: 4763024 (1988-08-01), Gay

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