A wideband sigma-delta PLL based phase modulator with pre-distortion filter

Author

Jiang, Shuai ; You, Fei ; He, Songbai

Author_Institution

Sch. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

Volume

4

fYear

2012

fDate

5-8 May 2012

Firstpage

1

Lastpage

4

Abstract

A wideband sigma-delta PLL based phase modulator is presented in this paper. In the proposed architecture a pre-distortion filter is applied to balance the phase signals, compensating the suppression beyond the loop bandwidth. By properly balancing the PLL transmission characteristics, the data rate limitation is relieved to the sigma-delta PLL bandwidth. The applicable condition of pre-distortion filter is also analyzed in this paper. The simulation results show that with PLL bandwidth of 1MHz the maximum phase error is no more than 10° and that RMS error is only 0.06° when transmitting 2.85 Mbps GMSK signals.

Keywords

filters; phase locked loops; phase modulation; sigma-delta modulation; GMSK signals; PLL transmission characteristics; RMS error; bandwidth 1 MHz; bit rate 2.85 Mbit/s; data rate limitation; loop bandwidth; phase error; phase modulator; phase signals; predistortion filter; wideband sigma-delta PLL bandwidth; Finite impulse response filter; Frequency modulation; IIR filters; Phase locked loops; Phase modulation; Sigma delta modulation; Phase modulation; Pre-distortion filter; sigma-delta PLL;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave and Millimeter Wave Technology (ICMMT), 2012 International Conference on

Conference_Location

Shenzhen

Print_ISBN

978-1-4673-2184-6

Type

conf

DOI

10.1109/ICMMT.2012.6230316

Filename

6230316