Phase locked demodulator

A phase detector provides a voltage output which depends upon the phase difference between a limited input signal and a reference signal. The phase detector increases the dynamic range of the resultant phase locked loop. An embodiment which illustrates the capability of the design is a SECAM color difference signal demodulator.

BRIEF SUMMARY OF INVENTION 
A phase locked demodulator is provided which includes means for providing a 
voltage output which depends upon the phase difference between a limited 
input signal and a variable reference signal. The demodulator includes 
digital means to supply outputs which are proportional to the 
instantaneous frequency of the limited input signal.

DETAILED DESCRIPTION OF INVENTION 
The essential material necessary to adequately disclose the invention and 
support the appended claims is hereby incorporated by reference to U.S. 
Pat. No. 3,863,264 and in particular to pages 7, 8 and 9 thereof.