Telecommunications – Receiver or analog modulated signal frequency converter – With particular receiver circuit
Patent
1992-10-13
1994-08-16
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
With particular receiver circuit
455 383, 455127, H04B 118
Patent
active
053394607
ABSTRACT:
In a mobile communication system wherein only the circuits necessary for detecting a call send or a call receive operation are activated intermittently to reduce power consumption from a battery during a stand-by period, and all of the circuits are continuously activated by being supplied with power during a call operation, an amplifier is provided at an output stage of an intermediate frequency amplifying circuit in the system. The amplifier has an output transistor whose output terminal is connected to a load circuit via a capacitor, a circuit for supplying an operating direct current to the output transistor and a semiconductor switch provided in the current supply circuit. When the semiconductor switch is cut off, a leakage current flows through the output transistor, so that an average direct current voltage level is generated at the output terminal of the transistor. Accordingly, when the semiconductor switch is turned ON, the average direct current voltage level at the load circuit is obtained at high speed, and the rise time characteristics of the load circuit are improved.
REFERENCES:
patent: 3611156 (1971-08-01), Ward
patent: 3896383 (1975-07-01), Bilotti
Komatsu Noriyoshi
Sakata Minoru
Eisenzopf Reinhard J.
Fujitsu Limited
Wisler Mark D.
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