The invention provides a chronometer time automatic measurement circuit based on TDC-GP 21 and a method, and solves the problems that due to adopting a double-bevel interpolation technology to measure a chronometer time interval in the prior art, the space is large, the cost is high, the
power consumption is large, and a measuring result has a zero-point error and a non-
linearity error. The chronometer time automatic measurement circuit based on the TDC-GP 21 comprises a first trigger, a delayer, a second trigger, a
multiplexer, a third trigger, a fourth trigger, a TDC-GP 21
chip and an FPGA (
field programmable gate array)
chip. The chronometer time automatic measurement circuit based on the TDC-GP 21 provided by the invention has the advantages that the structure is simple, the cost is low, the
power consumption is small, the measuring accuracy is high, the
linearity is good, and the measured time accuracy can achieve 45 ps; and the chronometer time automatic measurement circuit has an automatic
calibration function and can automatically compensate errors caused by the variation of
voltage and temperature, the measuring speed is rapid, and the replacement rate of a waveform of a digital type wavetable is observably improved.