Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1976-10-27
1977-09-13
Rolinec, Rudolph V.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
325383, 330 21, 330192, H03F 304
Patent
active
040485781
ABSTRACT:
An R.F. amplifier circuit having a high selectivity with a simple and inexpensive construction is provided. An R.F. choke coil acting as a bias supplying element is connected to a collector of an amplifying transistor to supply it with an optimum biasing current for a high electric field strength. A first capacitor is connected in parallel, at a high frequency, with the R.F. choke coil, which is connected to an LC tuning circuit through a second capacitor. A resonance frequency of the R.F. choke coil and the first capacitor is chosen to be sufficiently lower than that of the LC tuning circuit to maintain a single tuned circuit while at the same time an output impedance of the amplifying transistor is stepped up by the first and second capacitors to insure a high quality factor.
REFERENCES:
patent: 1956121 (1934-04-01), Craig
patent: 2542087 (1951-02-01), Kreithen
Dahl Lawrence J.
Hitachi , Ltd.
Rolinec Rudolph V.
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