Increasing the common mode range of a circuit

Details Increasing the common mode range of a circuit Increasing the common mode range of a circuit

2011-03-01

2011-03-01

Shingleton, Michael B (Department: 2815)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C250S2140AG, C348S300000

Reexamination Certificate

active

07898331

ABSTRACT:
Increasing the input common-mode range of a circuit which accepts differential signals as inputs. Such an increase may be attained by correcting an input signal at continuous levels or at 2 or more discrete levels) without changing the strength represented by the input signal. In an embodiment, the common-mode component of an input signal is measured, and a correction voltage proportional to the difference between the measured common-mode component and a reference voltage, is generated. The correction voltage is coupled to the input terminals of the differential circuit to correct for any deviations from a desired level of common-mode voltage at the input terminals of the differential circuit. The approaches are applied to a switched-capacitor differential amplifier used in a sample-and-hold portion of an ADC.

REFERENCES:
patent: 6617567 (2003-09-01), Mukherjee et al.
patent: 6774722 (2004-08-01), Hogervorst

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