Title :
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
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;
Conference_Titel :
Frequency Control Symposium, 1992. 46th., Proceedings of the 1992 IEEE
Conference_Location :
Hershey, PA
Print_ISBN :
0-7803-0476-4
DOI :
10.1109/FREQ.1992.270011
