Tracking loop filter with continuous bandwidth control smooths transition from wide to narrow band. Circuit was designed for Space Shuttle where bandwidth varied between 320 Hz for acquisition and 20 Hz for tracking. Field-effect transitor (FET) acts as voltage controlled variable resistance, changing time constant of filter between phase detector and voltage-controlled oscillator in phase-locked loop.
Continuous control of phase-locked-loop bandwidth
NASA Tech Briefs ; 5 , 1
1980-08-01
Miscellaneous
No indication
English
Phase Locked Servo Loop Circuit
NTIS | 1973
|Extrasensitive phase-locked-loop circuit
NTRS | 1977
|