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In order to improve the accuracy of the digital to analog conversion (DAC), the reflection and crosstalk problems of the signal transmission process were studied in this paper. The Hyperlynx software was used for the simulation study of reflection and crosstalk problems of the master clock signal in the DAC circuit. Source end cascading termination resistor and remote end termination resistor and capacitor (RC) methods were adopted to weaken the reflected signal. The problem of signal crosstalk was solved by the remote end cascading termination resistor method. The experiments results showed that the reflection peak could be eliminated when the value of the source end cascading termination resistor was 100Ω. The reflection peak could be eliminated when the value of remote end termination resistors was 100Ω and the capacitance was 300pF. Terminating 100Ω resistor, shortening the length of the transmission line and decreasing the distance of the adjacent network could weaken crosstalk phenomenon. In high precision digital to analog conversion circuit, the source end cascading termination resistor and the remote RC termination were adopted to solve the problems of signal reflection. The methods of optimizing wiring and the cascading termination resistor weakened the signal crosstalk phenomenon. They also improved signal integrity and ADC accuracy of the signal during transmission.

Analysis of Signal Integrity for High Precision Digital-to-Analog Conversion Circuit