Radio communication system having current control circuit

Details Radio communication system having current control circuit Radio communication system having current control circuit

1995-01-23

1996-05-14

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

4552341, 4552501, 4552521, 330278, H04B 116

Patent

active

055176844

ABSTRACT:
In a radio communication system, a predetermined bias voltage is applied to the base of a transistor in a high-frequency amplifier circuit immediately before the transistor makes its normal operation. When a high-frequency input signal is received under a weak electric field, a control circuit generates a control voltage Cc of a high level so that the high-frequency amplifier circuit can operate with its large amplification factor. This control voltage is supplied to the base of the transistor through a diode and a resistor in a current control circuit to be added to the predetermined bias voltage to increase the base current so that the high-frequency amplifier circuit operates with a large amplification factor. On the other hand, when the input signal is received under a strong electric field, the control circuit supplies a control voltage of a low level to the base of the transistor so that the high-frequency amplifier circuit operates with a small amplification factor.

REFERENCES:
patent: 3027518 (1962-03-01), Ketchledge
patent: 3052853 (1962-09-01), Smith
patent: 3173099 (1965-03-01), Oias
patent: 3254306 (1966-05-01), Carlson
patent: 3395357 (1968-07-01), Ketchledge
patent: 3510580 (1970-05-01), Okuno
patent: 3512096 (1970-05-01), Nagata et al.
patent: 4063175 (1977-12-01), Friedman
patent: 4718119 (1988-01-01), Salzer et al.
patent: 5239683 (1993-08-01), Usui

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