Amplifiers – With semiconductor amplifying device – Including field effect transistor
Patent
1986-01-27
1987-07-28
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including field effect transistor
330286, 330296, 330298, 330307, 361 91, H03F 152, H03F 316
Patent
active
046834435
ABSTRACT:
A single circuit which provides forward biasing, input impedance matching and voltage input limiting to a transistor which has a source, gate and drain terminal is presented. Biasing, input matching and limiting for a transistor is accomplished using two inductor coils, five crystal diodes, a positive voltage source, and three resistors. The forward biasing is achieved using three resistors, and the third, fourth and fifth crystal diode. The third resistor connects the drain terminal of the transistor to the positive voltage source. The second resistor connects the junction between the third resistor and the drain terminal to the transistor's gate terminal. The fourth and fifth crystal diodes are connected in series between the source terminal and the common electrical ground. The first resistor and third diode are connected in parallel between the transistor's gate terminal and the common electrical ground. Limiting of the input voltages over the gate terminal is accomplished by the first and second crystal diodes which are connected in series with each other and in a parallel circuit with the first resistor/diode and the common electrical ground. Finally, input impedance matching is accomplished by the two inductor coils which are connected in series with the gate terminal with the first three diodes and first resistor between them. The parasitic impedances of the three cyrstal diodes create a shunt capacitor in parallel with the first resistor. The shunt capacitor to ground and second inductor coil provide impedance matching to the transistor.
REFERENCES:
patent: 3286189 (1966-11-01), Mitchell et al.
patent: 3465260 (1969-09-01), Sullivan
patent: 3678402 (1972-07-01), Tempel
patent: 4011518 (1977-03-01), Irvine et al.
patent: 4174503 (1979-11-01), Merklinger et al.
patent: 4338572 (1982-07-01), Schurmann
Kaelin G. Robert
Weber Robert J.
Young James P.
Auton William G.
Mullins James B.
Singer Donald J.
The United States of America as represented by the Secretary of
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