A Low Power CMOS Squelch Detector

Abstract

The invention provides a low power consumption CMOS squelch detector, which includes: a level converter, a comparator module and an output detector module. The level converter includes a reference current source circuit, a current mirror circuit and a level conversion circuit. The level shifter is connected to the comparator module; the comparator module is connected to the output detector module. The level shifter is used to convert the differential input signal into a single-ended voltage signal that is easier to compare; the comparator module is used to compare the voltage signal; according to the results of the two differential comparators, the output detector module The output indicates whether the input is valid data. The invention reduces the circuit area and significantly reduces the power consumption of the squelch detector.

Description

Technical field[0001]The invention relates to the technical field of integrated circuits, in particular to a low-power CMOS noise detector.Background technique[0002]With the increase of circuit operating frequency, various high-speed serial interfaces have appeared, such as universal serial bus (USB), thunderbolt, high-speed serial interface (RocketIO), etc. In high-speed serial transceivers, the squelch detector is usually used to monitor whether the signal on the bus is noise or valid data. For example, for the USB2.0 standard, when the amplitude of the differential voltage envelope is less than the low threshold voltage (100 mV), the detection circuit gives a signal that the input is noise; when the amplitude of the differential voltage envelope is greater than the high threshold voltage (150 mV) mV), the detection circuit outputs a valid signal, and the receiver must perform data recovery on the received signal.[0003]The existing squelch detector structure mainly includes two ty...

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Problems solved by technology

[0003] The existing squelch detector structure mainly includes two types: one is to convert the differential input signal and the reference voltage into current signals for comparison through a voltage-current converter. Large footprint, poor reliability and high power consumption; another structure uses a simple level shifter and comparator, this structure circuit is relatively simple, reducing the scale and power consumption of the circuit, but the reliability of this structure Low, not suitable for low-voltage power supply design, and has a large power consumption

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