2013 AN-1001 An Analysis and Performance Evaluation of a Passive Filter

hi_china59

AN-1001 An Analysis and Performance Evaluation of a Passive Filter Design Technique for Charge Pump PLL's

Application Report
SNAA015B–May 1996–Revised April 2013
AN-1001 An Analysis and Performance Evaluation of a
Passive Filter Design Technique for Charge Pump PLL's
....................................................................................................................................................
ABSTRACT
The high performance of today's digital phase-lock loop makes it the preferred choice for generation of
stable, low noise, tunable local oscillators in wireless communications applications. This paper investigates
the design of passive loop filters for Frequency Synthesizers utilizing a Phase-Frequency Detector and a
current switch charge pump such as Texas Instruments PLLatinum™ Series. Passive filter design for a
TYPE II third order phase-lock loop is discussed in depth, with some discussion of higher order filters
included. Specific test results are presented for a GSM synthesizer design. Optimization of phase-lock
loop performance with respect to different parameters is discussed.
Contents
1 Conclusion ................................................................................................................... 8
2 References ................................................................................................................. 11
Appendix A Substitute Equations ............................................................................................. 12
List of Figures
1 Basic Charge Pump Phase Locked Loop................................................................................ 2
2 PLL Linear Model ........................................................................................................... 3
3 2nd Order Passive Filter ................................................................................................... 3
4 Open Loop Response Bode Plot.......................................................................................... 4
5 3rd Order Lowpass Filter................................................................................................... 5
6 Test Fixture Schematic..................................................................................................... 8
7 PLL Output Spectrum 100 kHz Span..................................................................................... 9
8 PLL 200 kHz Reference Spurs............................................................................................ 9
9 PLL Close in Phase Noise ................................................................................................. 9
10 PLL Positive Frequency Jump Waveform.............................................................................. 10
11 PLL Negative Frequency Jump Waveform............................................................................. 10
12 PLL Frequency Jump Lock Time........................................................................................ 10
List of Tables
1 PLL Filter Design Constants............................................................................................... 2
2 PLL Phase Transfer Functions ............................................................................................ 3
PLLatinum is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
SNAA015B–May 1996–Revised April 2013 AN-1001 An Analysis and Performance Evaluation of a Passive Filter Design 1
Submit Documentation Feedback Technique for Charge Pump PLL's
Copyright © 1996–2013, Texas Instruments Incorporated

cndeusa

了解一下，看看什么资料

markhorrow

非常感谢提供！

Night_sola

找了很久的东西，谢谢楼主

efong

THANK YOU

cdting

非常感謝~~~~

ather

xiede,xiede 写的还行啊

dannymu

谢谢