An All-Factor Modulation Bandwidth Extension Technique for Delta-Sigma PLL Transmitter

作者：Huang, Mo^*; Lu, Yan; Xiong, Xiao-ming; Seng-Pan, U.; Martins, R. P.

来源：IEEE Region 10 Conference, Macao, PEOPLES R CHINA, 2015-11-01 To 2015-11-04.

• Delta-sigma
• transmitters
• phase locked loop (PLL)
• modulation bandwidth extension

In this work, an all-factor modulation bandwidth extension technique for one-point delta-sigma (Delta Sigma) phase locked loop (PLL) transmitter is presented. The factors that need to be calibrated have been discussed. Firstly, RC variation of the loop filter is compensated by using an RC tracking circuit. Secondly, variation of the loop gain of the modulator is calibrated by sensing the magnitude differences between its values at DC and high frequency. Since two critical factors of PLL are calibrated, the proposed technique can achieve higher calibration accuracy. Moreover, this technique has been proven to be valid for all PLL types and orders by theoretical analyses given in this paper. And one particular case has been verified by measurement results.

• 出版日期2015
• 单位澳门大学; 广东工业大学