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US 9,319,041 B1Granted
Squelch detector
AssigneesGlobal Unichip Corporation, Taiwan Semiconductor Manufacturing Company, Ltd.
InventorsJu-Chieh Wang, Ting-Hsu Chien, Da-Rong Huang
Life of this patent
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Abstract
A squelch detector receives a first input signal, a second input signal VM, a first reference voltage and a second reference voltage. The first input signal and the second input signal are collaboratively defined as a differential input signal. The difference between the first reference voltage and the second reference voltage is defined as a squelch threshold. According to the squelch threshold, the squelch detector generates a detected signal to indicate whether the differential input signal is valid.
Claims11
A squelch detector, comprising:
- a first differential pair circuit receiving a first input signal and a second input signal, and generating a first current and a second current to a first node and a second node, respectively;
- a second differential pair circuit receiving the first input signal and the second input signal, and generating a third current and a fourth current to a third node and a fourth node, respectively;
- a reference differential pair circuit receiving a first reference voltage and a second reference voltage, and generating a first reference current and a second reference current to a fifth node and a sixth node, respectively;
- a first current mirror, wherein a current input terminal of the first current mirror is connected with the fifth node for receiving the first reference current, a first current mirroring terminal of the first current mirror is connected with the first node, and a second current mirroring terminal of the first current mirror is connected with the fourth node;
- a second current mirror, wherein a current input terminal of the second current mirror is connected with the sixth node for receiving the second reference current, a first current mirroring terminal of the second current mirror is connected with the second node, and a second current mirroring terminal of the second current mirror is connected with the third node;
- a first current-to-voltage converter connected with the first node and the second node, and generating a first output signal and a second output signal according to a current change of the first node and the second node;
- a second current-to-voltage converter connected with the third node and the fourth node, and generating a third output signal and a fourth output signal according to a current change of the third node and the third node;
- and
- a judging circuit receiving the first output signal, the second output signal, the third output signal and the fourth output signal, and generating a detected signal to indicate whether the first input signal and the second input signal are valid.
6 more elements
Dependencies are inferred from the claim text.