Operational amplifier

Details Operational amplifier Operational amplifier

1999-02-23

2000-07-04

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330253, H03F 345

Patent

active

060844760

ABSTRACT:
In an operational amplifier constituted by a differential stage which receives two input signals IN- and IN+ and outputs a signal NGP corresponding to the potential difference, a level shift stage which receives the signal NGP and outputs a level-shifted signal NGN, and an output stage which receives the signals NGP and NGN and outputs a signal OUT obtained by amplifying the potential difference between the two input signals, the level shift stage is formed from a DDA. Letting A1, A2, and A3 be the gains of the DDA, the input signal NGP, output signal NGN, and bias voltages VBP and VBN have a linear relation given by A3{A1(VBN-NGN)-A2(VBP-NGP)}=NGN. This maximizes the current drivability of a transistor TN1 on the output stage and controls the punch-through current flowing between transistors TP1 and TN1.

REFERENCES:
patent: 4335355 (1982-06-01), Haque
patent: 4524329 (1985-06-01), Abou
patent: 4668919 (1987-05-01), De Weck
patent: 4912425 (1990-03-01), Kobayashi et al.
patent: 5285168 (1994-02-01), Tomatsu et al.
patent: 5289058 (1994-02-01), Okamoto
patent: 5907259 (1999-05-01), Yamada et al.
patent: 5909146 (1999-06-01), Okada

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