DIFFERENTIAL LOW FREQUENCY NOISE SUPPRESSION TECHNIQUE FOR A COMMON MODE FEEDBACK CIRCUIT

DIFFERENTIAL LOW FREQUENCY NOISE SUPPRESSION TECHNIQUE FOR A COMMON MODE FEEDBACK CIRCUIT

Disclosed is a common mode feedback circuit for a differential amplifier that eliminates the effects of low frequency noise. A modulator is placed in a common mode feedback loop that modulates the feedback loop signal at a predetermined frequency to up-convert the low frequency noise. The predetermi...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: LIPKA RONALD J
Format: Patent
Sprache:eng
Schlagworte:
AMPLIFIERS
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
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Beschreibung
Zusammenfassung:Disclosed is a common mode feedback circuit for a differential amplifier that eliminates the effects of low frequency noise. A modulator is placed in a common mode feedback loop that modulates the feedback loop signal at a predetermined frequency to up-convert the low frequency noise. The predetermined frequency may be selected to be above the operating range of the downstream circuitry. In addition, a low pass filter can be used to eliminate the up-converted noise.