Frequency comparator circuits

Details Frequency comparator circuits Frequency comparator circuits

H - Electricity

03

L

328/164

H03L 7/08 (2006.01) H03D 13/00 (2006.01) H03L 7/085 (2006.01) H03L 7/091 (2006.01)

Patent

CA 1238954

- 9 - FREQUENCY COMPARATOR CIRCUITS Abstract A voltage comparator includes two sampled input networks connected in parallel between an input reference voltage and the inverting input of an integrator, the other input of which is grounded. The first input network has a first input capacitor which is through-switched at a first sampling frequency. The second input network has a second input capacitor which is diagonally-switched at a second sampling frequency, thus providing an output voltage to the integrator which is of opposite polarity to that of the first network. For a given ratio between the capacitors, the output of the integrator is determined by the relationship between the sampling frequencies, thus providing a comparator capability. Also disclosed is a frequency lock loop in which the output of a frequency comparator is filtered of the switching frequencies and utilized as the control voltage for a voltage controlled oscillator. The output of the oscillator is then coupled to a switching pulse generator which provides the switching pulses to the second input network of the comparator.

487800

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