Circuit for converting thermometer code into binary code circuit for time-to-digital converter

A technology of thermometer code and binary code, which is applied in the field of decoding circuit, can solve the problems of occupying flip-flop resources, long decoding time, and poor timing characteristics of the decoder, so as to improve accuracy and speed, improve overall performance, and good timing The effect of the characteristic
CN110703582AActive Publication Date: 2020-01-17天津天芯微系统集成研究院有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
天津天芯微系统集成研究院有限公司
Publication Date
2020-01-17

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Abstract

The invention discloses a circuit for converting a thermometer code into a binary code circuit for a time-to-digital converter. The circuit comprises: a LUT screening circuit and an RAM storage circuit, the thermometer code is used as an input signal, which is accessed to the LUT screening circuit, an LUT unit in the screening circuit performs negation on upper 5 bits of the input signal, adds a negation result to the lowest bit of the input signal to obtain an output signal, and accesses the output signal to a reading enable end of the RAM storage circuit as a control signal; and when the reading enable end is pulled up, the binary code in the corresponding RAM storage circuit is read out at the next clock rising edge, so that the conversion of the thermometer code into the binary code isrealized. The circuit disclosed by the invention solves the bubbling problem existing in a decoding process of the time-to-digital converter based on FPGA, and improves the overall performance of theFPGA type time-to-digital converter.
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Description

technical field

[0001] The invention relates to the field of integrated circuit measurement, in particular to a decoding circuit used in an FPGA-based time-to-digital converter to convert thermometer codes into binary codes. Background technique

[0002] Time interval measurement technology is of great significance to national economy and national defense industry construction. Accurate time interval measurement technology, especially picosecond (1ps=10 12 s) magnitude of technology is more important. Whether it is in theoretical research fields such as molecular biology, nuclear physics detection, or astronomical observation, or in engineering practice fields such as laser ranging, high-precision positioning, and food and drug safety monitoring, it has very important applications.

[0003] At present, the most widely used high-precision time interval measurement technology is time-to-digital converter (TDC) technology, and its most important technical index is measurement ...

Claims

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