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US 6,472,915 B1Granted
Method for charge pump tri-state and power down/up sequence without disturbing the output filter
AssigneeCypress Semiconductor Corporation
InventorsNathan Y. Moyal, Steven Meyers
Life of this patent
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Abstract
An apparatus comprising a phase lock loop (PLL) and a charge pump. The PLL may be configured to generate an output signal in response to an input signal. The charge pump may be configured within the PLL and be configured to (i) pump-up the input signal, (ii) pump-down the input signal or (iii) enter tri-state in response to a control signal.
Claims18
An apparatus comprising:
- a phase lock loop (PLL) configured to generate an output signal in response to an input signal;
- and
- a charge pump within said PLL configured to (i) pump-up said input signal, (ii) pump-down said input signal, (iii) enter a tri-state mode in response to a control signal, or (iv) power up or power down said charge pump in response to a power down signal or a power up signal, wherein said charge pump enters said tri-state mode without disturbing said output signal.
An apparatus comprising:
- means for phase locking an input signal;
- means for generating an output signal;
- means for pumping-up or pumping-down said input signal, means for powering up or powering down in response to a power up signal or a power down signal;
- and
- means for disconnecting said input signal in response to a first state of a control signal and connecting said input signal in response to a second state of said control signal, wherein said disconnecting means does not disturb said output signal.
2 more elements
A method for operating a charge pump, comprising the steps of:
- (A) disabling one or more filter nodes of said charge pump in response to a control signal;
- (B) powering up or powering down said charge pump in response to a power up signal or a power down signal;
- and
- (C) enabling or disabling said filter nodes after step (B), wherein said enabling or disabling does not disturb said output signal.
1 more element
Dependencies are inferred from the claim text.