Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1992-04-01
1993-09-07
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330145, H03G 330
Patent
active
052433005
ABSTRACT:
A high frequency amplifying apparatus comprises: an amplifier for broadband-amplifying an input signal; a choke coil having one end supplied with a supply voltage and the other end connected to an output of the amplifier; and an automatic gain control circuit for outputting an amplified input signal with a gain controlled in accordance with an automatic gain control voltage, having: a first diode having an anode connected to the output of the amplifier and a cathode; an impedance element, one end of the impedance element being connected to the cathode of the first diode, the other end of the impedance element being connected to the ground; and a second diode having a cathode connected to the cathode of the first diode and an anode supplied with the automatic gain control voltage. The impedance element comprises a resistor and a second choke coil connected in series with the resistor. However, the second choke coil can be omitted.
REFERENCES:
patent: 3634775 (1972-01-01), Ulmer et al.
Matsushita Electric - Industrial Co., Ltd.
Mullins James B.
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