Low-noise, wide offset range, programmable input offset...

Details Low-noise, wide offset range, programmable input offset... Low-noise, wide offset range, programmable input offset...

2011-05-17

2011-05-17

Nguyen, Hieu P (Department: 2817)

Amplifiers

With periodic switching input-output

C330S254000, C330S283000

Reexamination Certificate

active

07944287

ABSTRACT:
A programmable offset amplifier includes first (M1) and second (M2) input transistors having differentially connected sources and gates coupled to first (Vin+) and second (Vin−) input voltages. A tail current (Itail1) is shared between the first and second input transistors. First (M3) and second (M4) load devices are coupled between a reference voltage and drains of the first and second input transistors, respectively. An output stage (13) has a first input (+) coupled to the drain of the second input transistor and a second input (−) coupled to the drain of the first input transistor. Programmable voltage changes are produced on input elements of programmable input offset circuitry to cause changes in offset voltages associated with electrodes of the input transistors which are reflected back to the amplifier input to provide a large programmable input-referred offset voltage.

REFERENCES:
patent: 7443237 (2008-10-01), Liu
patent: 7592869 (2009-09-01), Bae et al.

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