Frequency synthesizer

Details Frequency synthesizer Frequency synthesizer

H - Electricity

03

L

H03L 7/24 (2006.01) G06F 1/02 (2006.01) G06F 7/72 (2006.01) G06J 1/00 (2006.01)

Patent

CA 2115593

ABSTRACT OF THE DISCLOSURE A saw-tooth waveform signal generating circuit 3 generates a saw-tooth waveform signal d in response to a timing signal b derived from a reference clock a. A voltage comparator 4 slices the saw-tooth waveform signal with a reference voltage to shape the waveform thereof, thereby producing a synthesizer output e having a rectangular waveform. A counter 5 adds or subtracts a predetermined value every time a reference clock arrives. The count of the counter 5 is converted to an analog value by a DAC 6 and then is applied to, for example, the saw-tooth waveform signal generating circuit as a bias. As a result, the voltage for causing the saw-tooth waveform signal to start rising or falling is manipulated to allow the voltage comparator to slice the saw-tooth waveform signal at any desired timing. Hence, a synthesizer output can be produced in any desired phase. 28

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