Delay circuit and method and device for controlling delay circuit to compensate power supply voltage drift

Abstract

The invention provides a delay circuit, which comprises a switch circuit, a variable loading circuit, a charge-discharge circuit and an output control circuit. The switch circuit is used for being opened when receiving pulse input signals to control the charge-discharge circuit to conduct charging to power supply voltage and being closed after the pulse input signals to control the charge-discharge circuit to conduct discharging. The variable loading circuit is used for adjusting resistance of resistors in the variable loading circuit, changing discharging speed of the charge-discharge circuit, and further adjusting discharging time length to enable continuous time length of delay signals output by the delay circuit to reach a standard value. The discharging time length determines the continuous time length of the delay signals. The charge-discharge circuit is used for charging to the power supply voltage when the switch circuit is opened, discharging when the switch circuit is closed and transmitting analog signals formed in charging and discharging to the output control circuit. The output control circuit is used for outputting delay signals according to the analog signals formed in charging and discharging. A method and a device for controlling the delay circuit to compensate power supply voltage drift are further provided. The delay circuit, the method and the device ensure that signals passing through the delay circuit are delayed in constant mode.

Description

technical field [0001] The invention relates to the field of semiconductor circuits, in particular to a delay circuit and a method and device for controlling the delay circuit to compensate power supply voltage drift. Background technique [0002] At present, delay circuits are used in semiconductor devices. After the pulse input signal passes through the delay circuit, a delay signal with a certain signal width (T) is output, such as figure 1 shown by the solid line. However, the signal passing through the delay circuit often does not have a constant delay, and T will change with changes in various parameters such as power supply voltage Vdd, ambient temperature, and process. For example, if the operating voltage Vdd is 1.8 volts, the delay signal corresponding to the output is figure 1 As shown in the middle solid line, when applied to the actual delay circuit, the power supply voltage will drift, depending on the specific delay circuit, it may be higher than 1.8 volts, ...

AI Technical Summary

Problems solved by technology

The greater the deviation of the above parameters from the ideal state, the greater the width change ΔT of the actual delay signal compared with the standard signal. When the semiconductor device has strict timing requirements, even if the value of ΔT is small, it will lead to serious problems. as a result of

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