Back to results
US 9,979,350 B2Granted
Operational amplifier based circuit with compensation circuit block used for stability compensation
AssigneeMediatek Inc.
InventorChi-Yao Yu
Life of this patent
Estimating the term…
Abstract
An operational amplifier based circuit has an operational amplifier, a feedback circuit, and a compensation circuit block. The feedback circuit is coupled between an output port and an input port of the operational amplifier. The compensation circuit block has circuits involved in stability compensation of the operational amplifier, wherein there is no stability compensation circuit driven at the output port of the operational amplifier.
Claims38
An operational amplifier based circuit comprising:
- an operational amplifier, wherein the operational amplifier is a multi-stage amplifier;
- a feedback circuit, coupled between an output port and an input port of the operational amplifier;
- and
- a compensation circuit block, comprising circuits involved in stability compensation of the operational amplifier;
- wherein the compensation circuit block comprises a first part of a stability compensation circuit arranged to apply the stability compensation to the operational amplifier, and the feedback circuit is reused as a second part of the stability compensation circuit;
- and there is no other stability compensation circuit connected to the output port of the operational amplifier;
- wherein the operational amplifier is a differential amplifier, and the stability compensation circuit is a differential-mode stability compensation circuit arranged to apply differential-mode stability compensation to the operational amplifier.
4 more elements
An operational amplifier based circuit comprising:
- a multi-stage operational amplifier, comprising an output stage;
- a feedback circuit, coupled between an output port and an input port of the multi-stage operational amplifier, the feedback circuit comprising:
- a first feedback network, comprising:
- a first node, coupled to one input node of the input port;
- and
- a second node, coupled to one output node of the output port;
- and
- a compensation circuit block, comprising circuits involved in stability compensation of the multi-stage operational amplifier, the compensation circuit block comprising:
- a first compensation circuit, coupled between the first node of the feedback network and one input node of the output stage;
- wherein the compensation circuit block comprises a first part of a stability compensation circuit arranged to apply the stability compensation to the operational amplifier, and the feedback circuit is reused as a second part of the stability compensation circuit.
7 more elements
An operational amplifier based circuit comprising:
- a differential operational amplifier;
- a feedback circuit, coupled between an output port and an input port of the differential operational amplifier;
- and
- a compensation circuit block, comprising circuits involved in stability compensation of the differential operational amplifier;
- wherein the compensation circuit block comprises a first part of a common-mode stability compensation circuit arranged to apply common-mode stability compensation to the differential operational amplifier, and the feedback circuit is reused as a second part of the common-mode stability compensation circuit.
2 more elements
An operational amplifier based circuit comprising:
- an operational amplifier;
- a feedback circuit, coupled between an output port and an input port of the operational amplifier;
- and
- a compensation circuit block, comprising circuits involved in stability compensation of the operational amplifier;
- wherein the compensation circuit block comprises a first part of a stability compensation circuit arranged to apply the stability compensation to the operational amplifier, and the feedback circuit is reused as a second part of the stability compensation circuit;
- and there is no other stability compensation circuit connected to the output port of the operational amplifier;
- wherein the operational amplifier is a differential amplifier, and the stability compensation circuit is a differential-mode stability compensation circuit arranged to apply differential-mode stability compensation to the operational amplifier.
4 more elements
An operational amplifier based circuit comprising:
- an operational amplifier;
- a feedback circuit, coupled between an output port and an input port of the operational amplifier;
- and
- a compensation circuit block, comprising circuits involved in stability compensation of the operational amplifier;
- wherein the compensation circuit block comprises a first part of a stability compensation circuit arranged to apply the stability compensation to the operational amplifier, and the feedback circuit is reused as a second part of the stability compensation circuit;
- and there is no other stability compensation circuit connected to the output port of the operational amplifier;
- wherein the operational amplifier is a differential amplifier, and the stability compensation circuit is a common-mode stability compensation circuit arranged to apply common-mode stability compensation to the operational amplifier.
4 more elements
An operational amplifier based circuit comprising:
- an operational amplifier;
- a feedback circuit, coupled between an output port and an input port of the operational amplifier;
- and
- a compensation circuit block, comprising circuits involved in stability compensation of the operational amplifier;
- wherein the compensation circuit block comprises a first part of a stability compensation circuit arranged to apply the stability compensation to the operational amplifier, and the feedback circuit is reused as a second part of the stability compensation circuit;
- and there is no other stability compensation circuit connected to the output port of the operational amplifier;
- wherein the feedback circuit comprises:
- a feedback network, comprising:
- a first node, coupled to one input node of the input port;
- and
- a second node, coupled to one output node of the output port;
- the compensation circuit block comprises:
- a compensation circuit, coupled to the first node of the feedback network and as said one input node of the input port, wherein one input signal of the operational amplifier based circuit is received through the compensation circuit;
- and the compensation circuit comprises a resistive component and a capacitive component connected in series, and said one input signal of the operational amplifier based circuit is received at an interconnection node between the resistive component and the capacitive component.
11 more elements
An operational amplifier based circuit comprising:
- an operational amplifier;
- a feedback circuit, coupled between an output port and an input port of the operational amplifier;
- and
- a compensation circuit block, comprising circuits involved in stability compensation of the operational amplifier;
- wherein the compensation circuit block comprises a first part of a stability compensation circuit arranged to apply the stability compensation to the operational amplifier, and the feedback circuit is reused as a second part of the stability compensation circuit;
- and there is no other stability compensation circuit connected to the output port of the operational amplifier;
- wherein the operational amplifier is a multi-stage amplifier having an output stage, the feedback circuit comprises:
- a first feedback network, comprising:
- a first node, coupled to one input node of the input port;
- and
- a second node, coupled to one output node of the output port;
- the compensation circuit block comprises:
- a first compensation circuit, coupled between the first node of the first feedback network and one input node of the output stage.
10 more elements
An operational amplifier based circuit comprising:
- an operational amplifier, wherein the operational amplifier is a multi-stage amplifier;
- a feedback circuit, coupled between an output port and an input port of the operational amplifier;
- and
- a compensation circuit block, comprising circuits involved in stability compensation of the operational amplifier;
- wherein the compensation circuit block comprises a first part of a stability compensation circuit arranged to apply the stability compensation to the operational amplifier, and the feedback circuit is reused as a second part of the stability compensation circuit;
- and there is no other stability compensation circuit connected to the output port of the operational amplifier;
- wherein the operational amplifier is a differential amplifier, and the stability compensation circuit is a common-mode stability compensation circuit arranged to apply common-mode stability compensation to the operational amplifier.
4 more elements
Dependencies are inferred from the claim text.