Amplifiers – With semiconductor amplifying device – Including field effect transistor
Patent
1975-07-03
1978-01-31
Dahl, Lawrence J.
Amplifiers
With semiconductor amplifying device
Including field effect transistor
330311, 330290, H03F 316
Patent
active
040718301
ABSTRACT:
A linear voltage amplifier includes an input stage which has a P channel MOSFET load device and an N channel input device. The complementary amplifier also includes a feedback circuit which includes a low pass filter coupled between the output stage and the gate electrode of the P channel load device. The P type tub region in which the N channel input MOSFET is located is biased by an adjustable bias circuit to control threshold voltage of the input MOSFET and thereby control the DC level of the output of the complementary amplifier. In one embodiment the biasing circuit includes a P channel MOSFET coupled in series with a diode connected N channel MOSFET between two voltage supply conductors, the gate of the P channel MOSFET being connected to the gate of the P channel MOSFET load device of the input stage. The junction between the P channel MOSFET and the diode connected N channel MOSFET is coupled to one terminal of a high value resistor, the other end of which is connected to the input conductor which is connected to the gate of the N channel input MOSFET.
REFERENCES:
patent: 3286189 (1966-11-01), Mitchell
patent: 3913026 (1975-10-01), Koehler
patent: 3917964 (1975-11-01), Carlson
Barbee Joe E.
Dahl Lawrence J.
Motorola Inc.
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