Duty cycle regulating circuit and duty cycle regulating method

Abstract

The invention provides a duty cycle regulating circuit. The duty cycle regulating circuit comprises an operational amplifier, a first switching element connected with the operational amplifier, a clock signal input terminal, a second switching element connected with the clock signal input terminal, a first inverter connected with the first switching element and the second switching element, a second inverter connected with the first inverter, a third inverter connected with the second inverter, a first resistor connected with the third inverter, a first capacitor connected with the first resistor, a transmission gate connected with the first inverter, a fourth inverter connected with the transmission gate, a second resistor connected with the fourth inverter, a second capacitor connected with the second resistor, and a clock signal output terminal connected with the first inverter, wherein, a positive phase input terminal of the operational amplifier is connected between the first resistor and the first capacitor, and an inverse phase input terminal of the operational amplifier is connected between the second resistor and the second capacitor. The invention further provides a duty cycle regulating method. The duty cycle regulating circuit has a simple structure, and the duty cycle of the generated clock signal is accurate.

Description

Technical field [0001] The invention relates to an adjustment circuit and an adjustment method, in particular to a duty ratio adjustment circuit and a duty ratio adjustment method that can adjust the duty ratio of an output clock signal to 50%. Background technique [0002] The duty cycle adjustment circuit is very important for the transmission of high-speed clock signals. The traditional duty cycle adjustment circuit is generally implemented by adjusting the switching threshold of signal transmission. By increasing or decreasing the switching threshold, the pulse width of high and low levels is changed. So as to realize the adjustment of the duty cycle. [0003] However, the structure of the traditional duty cycle adjustment circuit is complicated, and the peripheral circuit is required to provide bias, which makes the circuit of the clock path more complicated, and in the integrated circuit, it brings difficulties to the layout. Summary of the invention [0004] In view of the a...

AI Technical Summary

Problems solved by technology

[0003] However, the structure of the traditional duty ratio adjustment circuit is relatively complex, and peripheral circuits are required to provide bias, so that the circuit of the clock path is more complicated, and in the integrated circuit, it brings difficulties to the layout

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