A voltage-to-time converter and method for reducing parasitic capacitance and power supply influence

Abstract

The present invention provides a voltage-to-time converter and method for reducing the influence of parasitic capacitance and power supply. The voltage-to-time converter includes: a main sampling network, a compensation sampling network, a discharge network and an over-threshold detection unit. By using a compensation sampling network, the traditional The impact of VTC parasitic capacitance on the VTC output swing; and by compensating the sampling common mode level of the sampling network to compensate the design, reduce the traditional VTC threshold detection circuit threshold value is affected by the power supply voltage low-frequency disturbance, the voltage time converter of the present invention The output swing can be reduced by parasitic capacitance. The common mode level of the VTC input terminal voltage is related to the power supply voltage, which reduces the conversion error caused by the influence of the power supply voltage on the threshold, makes the threshold voltage not affected by the power supply voltage, and improves the conversion accuracy and performance.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a voltage-time converter and a method for reducing the influence of parasitic capacitance and power supply. Background technique [0002] The voltage-to-time converter (Voltage-to-Time Converter, referred to as VTC) uses a fixed clock pulse width to sample the input voltage, and then uses a constant current source to discharge in another clock phase, and then uses a threshold detection unit to detect whether the discharge voltage has reached When the threshold is exceeded, the output level of the threshold detection unit is reversed, thereby converting the input voltage signal into a clock delay proportional to the input voltage amplitude, and completing the conversion from the input voltage to the clock delay. [0003] When the traditional VTC switches from the sampling phase to the switching phase, due to the parasitic capacitance at the input of the MOSFET switch and the over-thresh...

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Problems solved by technology

[0003] When the traditional VTC switches from the sampling phase to the switching phase, due to the parasitic capacitance at the input of the MOSFET switch and the over-threshold detection unit, when the sampling capacitor is time-multiplexed by other modules, its size is strictly limited, and the value is small, and When the input voltage amplitude is small, the influence of parasitic capacitance will severely limit the voltage differential swing at the input terminal of the over-threshold electric measuring circuit, thus limiting the VTC output swing

In addition, the threshold of the traditional VTC over-threshold detection circuit is often related to the power supply voltage, and the threshold level of the over-threshold detection unit will be affected by voltage disturbances, thereby reducing the VTC conversion performance, severely limiting the application of VTC in small swing input voltages, and deteriorating conversion device performance

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