Charge Pump Voltage Stabilization via Divider Pre-Setup
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Solution Overview
Problem
Traditional charge pump circuits take a long time to stabilize the voltage at the control end, which hampers the efficiency of phase lock loop (PLL) circuits.
Innovation Solution
The charge pump circuit incorporates a main voltage divider and an assistant voltage divider to establish voltage division initially, allowing the voltage to be gradually decreased from half of the power voltage to a stable voltage using a first and second current, thereby reducing the time to stabilize the voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional charge pump circuit structure is used, then circuit simplicity is maintained, but voltage stabilization time is excessively long
Solution Approach 1:
The patent applies preliminary action by using voltage dividers to pre-establish a initial voltage at the control end before the charge pump operation begins. This preliminary voltage setup allows the control end to start from a mid-range voltage level rather than from ground or full supply voltage, significantly reducing the time required for the charge pump to stabilize the voltage to its target level.
Solution Approach 2:
The patent introduces voltage dividers as intermediary components between the power supply and the control end of the charge pump. These voltage dividers act as mediators that provide a pre-conditioned voltage level, enabling the charge pump to operate more efficiently and stabilize faster without requiring fundamental changes to the core charge pump structure.
2Speed
If voltage is decreased gradually from power voltage to stable voltage, then voltage stability is achieved, but phase locking speed is slow
Solution Approach 1:
By pre-establishing a initial voltage through voltage dividers before charge pump operation, the system achieves a head start in the voltage stabilization process. This preliminary action allows the voltage to reach the stable level much faster, thereby increasing phase locking speed while maintaining voltage stability through the controlled operation of the charge pump.
Data Source
AI summary
A charge pump circuit and a phase lock loop circuit (PLL) having the same are provided. A main voltage divider and an assistant voltage divider configured in the charge pump circuit generate a voltage division within a predetermined time of activating the charge pump circuit. Therefore, when the charge pump circuit initiates operating, a voltage of a control end of a main switch set configured in the charge pump circuit is set to be the voltage division. The voltage of the control end is gradually decreased from the voltage division to a stable voltage according to a first current and a second current flowing through the main switch set. Accordingly, it can decrease the time from initiating operation of the pump circuit to stabilizing the voltage of the control end, thereby it can increase the working efficiency of the PLL.