Latch Charge Pump Equalization Circuit for Startup Stability
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Solution Overview
Problem
Latch charge pumps experience non-optimal operation and potential malfunction during turning on and off due to uneven discharge of biasing capacitors, leading to imperfect switching of transistors and reduced output current.
Innovation Solution
Incorporation of equalization circuits between control terminals to limit voltage differences within specific ranges, preventing non-optimal operation by ensuring proper switching of transistors during charge pump startup and shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If latch charge pump operates during turning on and off, then charge pump can supply output current and voltage, but uneven discharge of biasing capacitors causes non-optimal operation and potential malfunction
Solution Approach 1:
An equalization circuit is introduced as an intermediary component between the biasing capacitors to balance their discharge rates. The equalization circuit includes equalization transistors that are activated during charging phases to ensure both biasing capacitors discharge at the same rate, preventing voltage imbalance and ensuring reliable operation during turning on and off transitions.
Solution Approach 2:
The equalization circuit performs preliminary action by equalizing the voltages across biasing capacitors before the charge pump enters normal operation or shutdown modes. By pre-balancing the capacitor voltages through controlled discharge paths, the system avoids malfunction during critical transition periods.
2Productivity
If biasing capacitors discharge at different rates, then charge pump can operate, but transistor switching becomes imperfect and output current is reduced
Solution Approach 1:
The equalization circuit acts as a mediator that synchronizes the discharge rates of biasing capacitors. By introducing equalization transistors with controlled conductivity, the circuit ensures that both capacitors discharge at matching rates, which maintains proper voltage levels for optimal transistor switching performance and maximizes output current.
Solution Approach 2:
The equalization circuit dynamically changes the discharge parameters of the biasing capacitors by activating equalization transistors during specific phases. This parameter adjustment ensures that the voltage difference between capacitors remains within optimal ranges, thereby maintaining perfect transistor switching and high output current throughout operation.
Data Source
AI summary
A charge pump including first and a second charge-pump stages electrically coupled, four pump capacitors connected between two enable terminals and four internal nodes, two pump transistors connected to the pump capacitors and to the internal nodes, and having respective control terminals, two biasing capacitors, connected between the control terminals and the enable terminals, and an equalization circuit connected between the control terminals and structured to limit the voltage between the control terminals within a first range of values.