Differential amplification circuit and method of noise removal

Details Differential amplification circuit and method of noise removal Differential amplification circuit and method of noise removal

1996-03-26

1999-04-27

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, 330261, H03F 345

Patent

active

058983414

ABSTRACT:
A voltage Vdd-Vee amplified by a differential amplification circuit is provided to a common mode feedback circuit which controls an average potential of the Vdd and Vee to be constant by controlling a gate potential of an E-FET and to a level shift & common mode feedback circuit which controls an average potential of VDD and VBB to be constant by controlling a current mirror circuit having E-FETs via resistors and a diode. Output voltage VAA-VBB is used as an source & input voltage of a voltage controlled oscillator in a PLL circuit using a high frequency. Instead of the level shift & common mode feedback circuit, a differential offset circuit can be used with a pair of current being approximately equal to each other.

REFERENCES:
patent: 4616189 (1986-10-01), Pengue, Jr.
patent: 4808944 (1989-02-01), Taylor

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