Input stage for rail-to-rail input op amp

Details Input stage for rail-to-rail input op amp Input stage for rail-to-rail input op amp

1998-10-06

2000-02-29

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, H03F 345

Patent

active

060314230

ABSTRACT:
Methods and apparatus for providing a rail-to-rail op amp are disclosed. The rail-to-rail op amp includes a P-channel input stage and an N-channel input stage. The P-channel input stage includes a set of P-channel MOS transistors and the N-channel input stage includes a set of N-channel MOS transistors. The set of N-channel MOS transistors and the set of P-channel MOS transistors are capable of connecting to an inverting input and a non-inverting input. The op amp further includes a mirroring circuit adapted for sensing current flowing through the P-channel input stage and mirroring a portion of the sensed current. A threshold voltage reduction circuit is adapted for reducing the threshold voltage of the P-channel input stage in proportion to the mirrored current.

REFERENCES:
patent: 5734297 (1998-03-01), Huijsing et al.
patent: 5789982 (1998-08-01), Uscategui et al.
patent: 5801564 (1998-09-01), Gasparik

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