Receiving circuits and methods for increasing bandwidth
AssigneeShanghai Zhaoxin Semiconductor Co., Ltd.
InventorZhaoyang Sun
Life of this patent
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Abstract
A receiving circuit and method for increasing bandwidth are provided. The receiving circuit includes a linear equalizer circuit and a variable gain amplifier. The linear equalizer circuit includes a first negative impedance converter, to generate a first capacitance. The variable gain amplifier is coupled to the linear equalizer circuit. The variable gain amplifier includes a first-stage gain circuit and a feedback circuit. The first-stage gain circuit is coupled to the feedback circuit, and the feedback circuit generates a zero-point at the output end of the first-stage gain circuit.
Claims12
A receiving circuit, comprising:
- a linear equalizer circuit, comprising a first negative impedance converter, the first negative impedance converter generates a first capacitance;
- and
- a variable gain amplifier, coupled to the linear equalizer circuit and comprising a first-stage gain circuit and a feedback circuit, wherein the first-stage gain circuit is coupled to the feedback circuit, and the feedback circuit generates a zero-point at an output end of the first-stage gain circuit,
- wherein the variable gain amplifier further comprises a second-stage gain circuit, the second-stage gain circuit is coupled to the first-stage gain circuit and the feedback circuit to feed back the output signal of the second-stage gain circuit to the output end of the first-stage gain circuit through the feedback circuit,
- wherein the second-stage gain circuit further comprises a second negative impedance converter, and
- wherein the second negative impedance converter comprises a third adjustable capacitor and a second negative impedance conversion module, the second negative impedance conversion module is coupled to the feedback circuit and converts the third adjustable capacitor to generate a third capacitance.
A method for increasing bandwidth, applied to a receiving circuit, comprising:
- generating a first capacitance by a first negative impedance converter of a linear equalizer circuit of the receiving circuit;
- receiving an output signal generated by the linear equalizer circuit by a first-stage gain circuit of a variable gain amplifier of the receiving circuit;
- coupling a second-stage gain circuit of the variable gain amplifier to the first-stage gain circuit and a feedback circuit of the variable gain amplifier, to feed back the output signal of the second-stage gain circuit to the output end of the first-stage gain circuit through the feedback circuit, wherein the second-stage gain circuit further comprises a second negative impedance converter;
- using a second negative impedance conversion module of the second negative impedance converter to convert a third adjustable capacitor of the second negative impedance converter to generate a third capacitance, wherein the first negative impedance conversion module is coupled to an equalizer of the linear equalizer circuit;
- and
- generating a zero-point at the output end of the first-stage gain circuit by the feedback circuit of the variable gain amplifier.
Dependencies are inferred from the claim text.