Pll frequency synthesizer having power saving function

Details Pll frequency synthesizer having power saving function Pll frequency synthesizer having power saving function

H - Electricity

03

L

H03L 7/18 (2006.01) H03L 7/06 (2006.01) H03L 7/08 (2006.01) H03L 7/14 (2006.01) H03L 7/193 (2006.01)

Patent

CA 2087372

- 12 - ABSTRACT OF THE DISCLOSURE In a PLL frequency synthesizer capable of minimizing power consumption in the power saving operation, there are disposed a voltage controlled oscillator, a phase detector, an active filter, a reference frequency oscillator, a dual modulus prescaler, and a pulse swallow counter having a modulus control terminal. In the power saving operation, the terminal is set to an open state or a grounding state by a controller to prevent power of a power source from being supplied via the pulse swallow counter to the dual modulus prescaler.

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