Miscellaneous active electrical nonlinear devices – circuits – and – External effect – Temperature
Patent
1993-04-02
1995-01-31
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
External effect
Temperature
330289, 327362, 327307, H03F 130
Patent
active
053861604
ABSTRACT:
An operational amplifier bias system provides input offset voltage trim current with minimum offset thermal drift. The bias system includes a bias generator that provides bias current to the op amp. Correction circuitry responsive to the bias current provides an input offset trim current that compensates for offset drift error with change in temperature. The correction circuitry includes a resistive element, an input current mirror responsive to the bias current for providing a reference current to the resistive element to provide a temperature coefficient conversion current having a predetermined temperature coefficient, and a voltage reference that sets the resistance of the resistive element.
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J. Haspeslagh and W. Sansen, "Design Techniques for Fully Differential Amplifiers", IEEE 1988 Custom Integrated Circuits Conference, May 16, 1988, pp. 1221-1224.
Archer Donald M.
Hoei Jung S.
Callahan Timothy P.
National Semiconductor Corporation
Nu Ton My-Trang
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