Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1979-06-11
1980-12-16
Smith, Alfred E.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, 330277, H03F 345, H03F 316
Patent
active
042400392
ABSTRACT:
An amplifier having a differential input provides high gain, good common mode rejection, and linear response uses MOS transistors in a conventional integrated circuit construction. The circuit consists of four direct coupled stages, each one including a depletion and an enhancement transistor. The enhancement transistors are cascaded to provide a high gain common source connected amplifier. The depletion transistors in the four stages are alternately driven from the differential input terminals. This configuration provides a common mode range that can exceed the supply voltage by a wide margin. The differential response is linear and displays high gain. The common mode signal rejection is substantial. The circuit operates over a very wide range of supply voltages.
REFERENCES:
Hoffman, C. R., "Common-Mode Translator for a Differential Signal Using MOSFET Technology," IBM Tech. Disclosure Bull., vol. 21, No. 4, Sep., 1978, pp. 1590-1592.
Grigsby T. N.
National Semiconductor Corporation
Sheridan James A.
Smith Alfred E.
Woodward Gail W.
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