Charge pump circuit having switching circuits for reducing...

Details Charge pump circuit having switching circuits for reducing... Charge pump circuit having switching circuits for reducing...

H - Electricity

03

L

H03L 7/08 (2006.01) H02M 3/07 (2006.01) H03L 7/089 (2006.01) H03L 7/18 (2006.01)

Patent

CA 2300346

To reduce leakage current from a current source transistor in a charge pump circuit of a PLL circuit, the charge pump circuit activated according to an up signal or a down signal generated according to whether the phase of a clock output from VCO is faster or slower than that of a reference clock for generating current for charging ar discharging LPF that supplies input to VCO of the disclosed PLL circuit, The charge pump circuit is composed of a first current source transistor for generating current for charging LPF, a first switching transistor for connecting the first current source transistor to a power source according to an up signal, a second current source transistor for generating current for discharging LPF and a second switching transistor for grounding the second current source transistor according to a down signal, and bias is applied to the first and second current source transistors when the charge pump circuit is inactive.

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