High-speed high-precision time domain analog-to-digital converter

Abstract

The invention discloses a high-speed high-precision time domain analog-to-digital converter, which comprises a Flash module (1) used for generating a reference voltage; a VTC module (2) connected withthe Flash module (1) and used for sampling an input voltage signal VIN and processing the input voltage signal VIN according to the reference voltage to obtain a first time signal; an interpolation module (3) connected with the VTC module (2) and used for subdividing the first time signal to obtain a second time signal; a time domain comparator module (4) connected with the interpolation module (3) and used for comparing the second time signal and outputting a thermometer code; and digital decoding module (5) connected with the time domain comparator module (4) and used for converting the thermometer code into a binary code and outputting the binary code. According to the time domain analog-to-digital converter provided by the invention, the ADC speed is improved, the power consumption isreduced, and the speed and the power consumption are controllable.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a high-speed and high-precision time-domain analog-to-digital converter. Background technique [0002] An analog-to-digital converter (Analog to Digital Converter, ADC) is a converter that converts an analog quantity that has been compared with a standard quantity (or reference quantity) into a discrete signal represented by a binary value. With the development of integrated circuit technology, higher requirements are put forward for the sampling rate and conversion accuracy of ADC. In practice, the time-domain ADC is a new ADC architecture that enables ultra-high-speed ADCs. [0003] The traditional time-domain ADC mainly uses a ring oscillator to directly quantize the input voltage into a time signal. [0004] However, as the sampling rate increases, the oscillation frequency of the ring oscillator directly affects the accuracy and speed of the ADC; an...

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Problems solved by technology

[0004] However, as the sampling rate increases, the oscillation frequency of the ring oscillator directly affects the accuracy and speed of the ADC; and due to the limitation of the sampling period, the quantization time of the maximum input voltage signal must be less than the quantization period of the ADC, so that the input The signal amplitude and the speed of the ADC create limitations

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