US 5,673,002 A · Operational amplifier having stable operations for a wide range of source voltage, and current detector circuit employing a small number of elements

Abstract

An operational amplifier has a differential amplification section, an output section, a control signal generation unit, and a drive control unit. The output section has a first transistor of a first conductivity type and a second transistor of a second conductivity type that is opposite to the first conductivity type. The first and second transistors are connected in series between a first power source unit and a second power source unit, and the first transistor is driven according to an output of the differential amplification section. The control signal generation unit is used to detect a current flowing through the first transistor and generate a control signal in response to the detected current. The drive control unit is used to drive the second transistor in response to the control signal.

Claims10

Dependent claims

A current detector circuit comprising:

a first detecting object;
a first current detector for detecting a current flowing through said first detecting object;
a second detecting object;
a second current detector for detecting a current flowing through said second detecting object;
and
a monitor including a first transistor having a control terminal connected to an output of said first current detector and a second transistor having a second terminal connected to a first terminal of said first transistor and a control terminal connected to an output of said second current detector, said first and second transistors having identical characteristics.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

08/694,288Filed 8 Aug 1996 · division

Priority

JP 6-13542617 Jun 1994

Granted

30 Sep 1997

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

H03F 3/345
With semiconductor devices only: with field-effect devices
H03F 1/308
In push-pull amplifiers: using mosfet
H03F 3/3001
Single-ended push-pull [SEPP] amplifiers ; Phase-splitters therefor: with field-effect transistors
H03F 3/3023
CMOS common source output SEPP amplifiers: with asymmetrical driving of the end stage

Operational amplifier having stable operations for a wide range of source voltage, and current detector circuit employing a small number of elements

Life of this patent

Operational amplifier having stable operations for a wide range of source voltage, and current detector circuit employing a small number of elements

Life of this patent

Abstract

Claims10