Title：A Gain calibration method of high pass path DAC in a two-point modulation transmitter

Country：China

Patent No.：201510194064.4

Legal Status：Authorized

Inventor：Zhaoyang Weng, Hanjun Jiang, Jingjing Dong, Chao Yang, Woogeun Rhee, Zhihua Wang

Assignee：Tsinghua University

Address：Mailbox No. 82, Beijing 100084

Filing Date：2015-04-22

Issue Date：2017-04-19

The invention discloses a gain calibration method for a high-pass closed circuit digital-to-analog converter in a two-point modulation transmitter. The method comprises the steps of disconnecting a phase-locked loop at the position of a voltage-controlled oscillator, fixing the control voltage of the phase-locked loop, conducting frequency division on the output of the voltage-controlled oscillator at the transmitting end to a position near the local frequency of the receiving end with the local frequency ratio between the transmitting end and the receiving end as the frequency dividing ratio, and introducing the output to the input end of a frequency mixer of a reception closed circuit; inputting a minimum digital signal and a maximum digital signal to the input end of the high-pass closed circuit digital-to-analog converter, conducting down-conversion on high frequency under two conditions to obtain low frequency by means of the receiving end, and obtaining first frequency and second frequency through calculation by means of a digital circuit; finally, obtaining the gain of a high-pass closed circuit according to the two measured frequencies and corresponding digital input of the high-pass closed circuit. According to the method, a high-integrity-intensity transceiver is fully utilized, more than one structural feature of a local oscillator is obtained, down-conversion is conducted on high frequency output by the voltage-controlled oscillator to obtain low frequency by means of a receiving closed circuit, and then frequency measurement is facilitated.

Patent Certificate： PDF/Jpg