Sensitivity of fast settling PLLs to differential loop filter component variations

Author

Endres, Thomas J. ; Kirkpatrick, James B.

Author_Institution

Hughes Aircraft Co., Los Angeles, CA, USA

fYear

1992

Firstpage

213

Lastpage

224

Abstract

An operational amplifier configured as a combined differential amplifier and integrator may exhibit a transient response which can be catastrophic to a phase-locked loop (PLL) intended for fast phase settling. A practical mathematical model for the loop filter is derived, and corresponding effects are shown in a frequency synthesizer by means of computer simulation and empirical data. Phase settling is shown to be sensitive to small variations in the loop filter components, well within the device tolerances

Keywords

SPICE; automatic frequency control; circuit analysis computing; differential amplifiers; frequency synthesizers; operational amplifiers; phase-locked loops; variable-frequency oscillators; PSPICE; VCO; combined differential amplifier and integrator; computer simulation; differential loop filter component variations; fast phase settling; frequency synthesizer; model; operational amplifier; phase-locked loop; transient response; Circuits; Control system synthesis; Filters; Frequency conversion; Frequency synthesizers; Operational amplifiers; Phase detection; Phase locked loops; Voltage; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium, 1992. 46th., Proceedings of the 1992 IEEE

Conference_Location

Hershey, PA

Print_ISBN

0-7803-0476-4

Type

conf

DOI

10.1109/FREQ.1992.270011

Filename

270011