High-precision large-range time-to-digital converter based on differential charging
A time-to-digital converter technology, which is applied in the field of high-precision and large-scale time-to-digital converters, can solve the problem that the range and accuracy are not easy to balance, and achieve the effect of easy expansion.
Active Publication Date: 2014-03-12
INST OF ELECTRONICS CHINESE ACAD OF SCI
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[0004] The purpose of the present invention is to provide a time-to-digital converter based on differential charging with high precision, large input range, small chip area, and low power consumption, so as to solve the problem that the existing time-to-digital converters are not easy to balance the range and precision
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[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0035] figure 1 It is the functional block diagram of the time-to-digital converter of the present invention, as figure 1 As shown, the time-to-digital converter includes a time segmenter 101, an initiator 102, a master charge pump 103, a pulse generator 104, a slave charge pump 105, a selection circuit 106, a comparison circuit 107, an AND gate 108, and a rough measurement counter 109 and fine measuring counter 110, wherein:
[0036]The time segmenter 101 has a port one, a port two and a port three, and the port one and the port two are respectively used to input two transition edge signals with continuous time intervals, and the signal input by the port one is marked as a START signal , the signal input by the port tw...
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The invention discloses a high-precision large-range time-to-digital converter based on differential charging. The converter comprises a time slicing machine, a pulse generator, a starter, master and slave charge pumps, a selection circuit, a comparison circuit, a rough measurement counter, and a fine measurement counter. The time slicing machine divides a to-be-measured time interval into three parts, one part is quantized by the rough measurement counter, and the other two parts are converted into voltage information through the master charge pump. The starter generates approximation signals to trigger the pulse generator to generate charging-discharging pulse, and the slave charge pump is charged. The fine measurement counter records the number of the approximation signals. The selection circuit selects a voltage output from the slave charge pump and compares with voltage of the master charge pump. With incensement of clock period number, the voltage of the slave charge pump approaches the voltage of the master charge pump, and when the two voltages are equal, the comparison circuit output jumps and the fine measurement counter stops counting. Counting results of the rough measurement counter and the fine measurement counter are final measurement results. The converter can perform high-precision conversion on large range time interval.
Description
technical field [0001] The invention belongs to the technical field of time measurement, in particular to a high-precision and large-range time-to-digital converter based on differential charging. Background technique [0002] As a key technology, high-precision and wide-range time measurement is widely used in many fields, such as laser ranging (LRF), navigation and communication, high-energy physics experiments, satellite monitoring, scientific metrology and other fields. Precise time measurement is indispensable in both national defense and civilian fields, and with the development of technology, time measurement is developing in the direction of high precision and large input range to meet the requirements of many applications. [0003] A time-to-digital converter (Time-to-Digital Converter, TDC) is a device that converts a time interval into a digital output, similar to an analog-to-digital converter (Analog-to-Digital Converter, ADC) to a certain extent, except that A...
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Inventor 王新刚王飞杨海钢
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI