Amplifier circuit having a pair of differential transistors with

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Nonlinear amplifying circuit

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327 67, 327562, 330253, 330293, G06G 712

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active

058724826

ABSTRACT:
An amplifier circuit for analog-signal processing has an operational amplifier having an output, an inverting input, and supply inputs for accepting a single supply potential and a reference potential. The operational amplifier has a noninverting input capable of accepting a signal voltage of a varying analog signal input thereto which has a positive value range and a negative value range relative to the reference potential. The output is fed back to the inverting input and the operational amplifier has a differential amplifier having first and second field-effect transistors. The first field-effect transistor has a gate connected to the noninverting input of the operational amplifier and the second field-effect transistor has a gate connected to the inverting input. The first field-effect transistor has a threshold voltage lower than a threshold voltage of the second field-effect transistor by an amount at least equal to an amount of a value range of the analog signal voltage outside a range defined by the single supply potential and the reference potential to offset an output signal at the output to within the range defined by the single supply potential and the reference potential.

REFERENCES:
patent: 4195239 (1980-03-01), Suzuki
patent: 4464588 (1984-08-01), Wieser
patent: 4952821 (1990-08-01), Kokubun
patent: 5159260 (1992-10-01), Yoh et al.
patent: 5252868 (1993-10-01), Miida et al.
patent: 5557234 (1996-09-01), Collins
IEEE Journal of Solid-State Circuits, vol. SC-13, No. 6, Dec. 1978, "A New NMOS Temperature-Stable Voltage Reference", by Robert A. Blauschild et al.

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