Amplifier circuit with high-order damping circuit and the high-order damping circuit
AssigneeMediatek Inc.
InventorSung-Han Wen
Life of this patent
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Abstract
An amplifier circuit with in-band gain degradation compensation is shown. The amplifier circuit has an input-stage amplifier, at least one intermediate-stage amplifier, and an output-stage amplifier cascaded between an input port and an output port of the amplifier circuit. A compensation capacitor is coupled between the output port of the amplifier circuit and an output port of the input-stage amplifier. A high-order damping circuit is coupled to an output port of the intermediate-stage amplifier.
Claims16
An amplifier circuit, comprising:
- an input-stage amplifier, at least one intermediate-stage amplifier, and an output-stage amplifier, cascaded between an input port and an output port of the amplifier circuit;
- a compensation capacitor, coupled between the output port of the amplifier circuit and an output port of the input-stage amplifier;
- and
- a first high-order damping circuit, coupled to an output port of the intermediate-stage amplifier,
- wherein the first high-order damping circuit comprises:
- a first-stage high-pass filter, having an input port coupled to the output port of the intermediate-stage amplifier;
- a second-stage high-pass filter, having an input port coupled to an output port of the first-stage high-pass filter;
- and
- an auxiliary amplifier, having an input port coupled to an output port of the second-stage high-pass filter, and an output port coupled to the input port of the first-stage high-pass filter.
A high-order damping circuit compensating for in-band gain degradation of an amplifier circuit that comprises an input-stage amplifier, at least one intermediate-stage amplifier, and an output-stage amplifier cascaded between an input port and an output port of the amplifier circuit, comprising:
- a first-stage high-pass filter, having an input port coupled to an output port of the input-stage amplifier or an output port of the intermediate-stage amplifier;
- a second-stage high-pass filter, having an input port coupled to an output port of the first-stage high-pass filter;
- and
- an auxiliary amplifier, having an input port coupled to an output port of the second-stage high-pass filter, and an output port coupled to the input port of the first-stage high-pass filter.
Dependencies are inferred from the claim text.