US 8,525,571 B2Granted

Voltage amplitude limiting circuit of full differential circuit

AssigneeC-Media Electronics Inc.

InventorsChih Ying Huang, Wen Lung Shieh

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Abstract

A voltage amplitude limiting circuit of a full differential circuit is provided for limiting voltage levels of a differential signal. The voltage amplitude limiting circuit includes a reference voltage generating unit and a replacing circuit. The reference voltage generating unit generates a high reference voltage and a low reference voltage. The replacing circuit is coupled to the reference voltage generating unit, a first input terminal and a second input terminal. When voltage at the first input terminal is greater than the high reference voltage, the replacing circuit uses the high reference voltage to replace the voltage at the first input terminal to serve as an output. When voltage at the first input terminal is less than the low reference voltage, the replacing circuit uses the low reference voltage to replace the voltage at the first input terminal to serve as an output.

Claims12

Dependent claims

A voltage amplitude limiting circuit of a full differential circuit for limiting a differential voltage signal received from a first input terminal and a second input terminal, comprising:

a reference voltage generating unit for generating a high reference voltage and a low reference voltage level;
and
a replacing circuit coupled to the reference voltage generating unit, the first input terminal and the second input terminal, wherein when voltage at the first input terminal is greater than the high reference voltage, the replacing circuit uses the high reference voltage to replace the voltage at the first input terminal, and outputs the high reference voltage at a first output terminal of the replacing circuit;
when voltage at the first input terminal is less than the low reference voltage, the replacing circuit uses the low reference voltage to replace the voltage at the first input terminal, and outputs the low reference voltage at the first output terminal of the replacing circuit.

1 more element

Dependencies are inferred from the claim text.