Method and system for common mode feedback circuitry for RF...

Details Method and system for common mode feedback circuitry for RF... Method and system for common mode feedback circuitry for RF...

2006-09-19

2006-09-19

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

Reexamination Certificate

active

07109798

ABSTRACT:
For a high frequency buffer, a high frequency output path may be isolated from a low frequency feedback path using a common mode feedback loop. The common mode feedback loop may be utilized to adjust an output DC level. The common mode feedback loop may comprise a first differential amplifier and a first transistor. An output of the first differential amplifier may be coupled to an input of the first transistor, and the low frequency feedback path may communicate the output DC level from an output of the first transistor to a first input of the first differential amplifier. A reference voltage may be communicated to a second input of the first differential amplifier, and this reference voltage may be variable. The first differential amplifier may be adapted to compare the inputs and generate a control voltage, which may be utilized to adjust the output DC level.

REFERENCES:
patent: 3652950 (1972-03-01), Hilbert
patent: 4491802 (1985-01-01), Uchida et al.
patent: 5187448 (1993-02-01), Brooks et al.

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