Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1978-12-19
1981-01-27
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330277, 330311, H03F 316, H03F 345
Patent
active
042478243
ABSTRACT:
A high gain linear amplifier comprises an MOS transistor amplifier stage having a load circuit which includes two depletion mode transistors connected in cascode. A compensating circuit compensates the variation of threshold voltage (V.sub.T) with back bias voltage (V.sub.SB) of the cascode load transistors by applying a voltage to the gate electrode of one of said two transistors in the opposite sense to the V.sub.T -V.sub.SB variation. The compensating voltage may be produced by connecting an enhancement mode transistor in cascode with a depletion mode transistor with the drain of the enhancement transistor connected to the source of the depletion transistor and to the common connection of their gates which also are connected to the gates of the load transistors.
REFERENCES:
patent: 3715693 (1973-02-01), Fletcher et al.
patent: 3913026 (1975-10-01), Koehler
patent: 3947778 (1976-03-01), Hsiao et al.
patent: 4069431 (1978-01-01), Kucharewski
Franzblau Bernard
Mullins James B.
Streeter William J.
U.S. Philips Corporation
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