PERFORMANCE OF A COMBINATION PHASE AND FREQUENCY LOCK SYSTEM.
NAVAL ORDNANCE LAB WHITE OAK MD
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The report deals with the design of a synchronous demodulator for the detection of AM multiplexed signals. The demodulation scheme is unusual in that two separate feedback control loops are employed to lock the local oscillator of the demodulator in phase with the input carrier a discrete-step coarse control loop for the purpose of handling large errors in frequency, and a conventional phase lock loop for fine control over small frequency and phase errors. A simple linear model of the phase lock loop is employed for the optimization of the phase lock loop. Transition between the coarse and fine control loops is studied in detail by means of numerical analysis of the non-linear region of operation of the phase lock loop. Author
- Electrical and Electronic Equipment