Non-switched capacitor offset voltage compensation in...

Details Non-switched capacitor offset voltage compensation in... Non-switched capacitor offset voltage compensation in...

2005-02-22

2005-02-22

Choe, Henry (Department: 2817)

Amplifiers

With periodic switching input-output

C330S253000, C327S124000

Reexamination Certificate

active

06859095

ABSTRACT:
A method for reducing offset voltage in an operational amplifier without the need for switched-capacitors, includes introducing a tapped resistor chain between the common connected terminals of the transistors of the input differential pair of the operational amplifier and connecting the tail current source/sink of the differential amplifier to a selected tap of the resistor chain. The invention further provides an improved operational amplifier in accordance with the above method.

REFERENCES:
patent: 4356450 (1982-10-01), Masuda
patent: 4933643 (1990-06-01), Jandu et al.
patent: 6137362 (2000-10-01), Dufossez
patent: 6140872 (2000-10-01), McEldowney
patent: 6262625 (2001-07-01), Perner et al.
patent: 6661288 (2003-12-01), Morgan et al.

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