Charge Pump Capacity Switching for Ripple and Voltage Stress Control
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Solution Overview
Problem
Conventional charge pump systems face challenges in controlling peak-to-peak ripple of output voltage, particularly when supporting programming currents over a wide range of input supply voltages, leading to increased ripple and voltage stress on peripheral circuits.
Innovation Solution
The proposed solution involves a feedback mechanism, a pump regulator, a voltage control unit, and a low voltage detector to generate a control signal that adjusts the input supply voltage, selecting between different circuit components to dynamically adjust the input supply voltage range, thereby reducing peak-to-peak ripple and improving control over the programming voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the charge pump capacity is boosted to support programming currents at lower input supply voltages, then the programming capability over wide voltage range is improved, but the peak-to-peak ripple of the output voltage increases
Solution Approach 1:
The charge pump capacity is made dynamically adjustable through a capacity control circuit that receives a capacity control signal. This signal selectively adjusts the charge pump capacity based on the input supply voltage level, allowing the system to adapt to different voltage conditions while maintaining acceptable ripple levels.
Solution Approach 2:
The system changes the operating parameters of the charge pump by adjusting its capacity according to the input supply voltage. When the input voltage is low, the capacity is increased to maintain programming current capability. When the input voltage is high, the capacity is reduced to minimize output voltage ripple.
2Power
If the charge pump capacity is increased to support lower input supply voltages, then the programming current support is improved, but the voltage stress on peripheral circuits increases
Solution Approach 1:
The charge pump capacity is dynamically adjusted based on the input supply voltage level. At lower input voltages, the capacity is increased to maintain adequate programming current. At higher input voltages, the capacity is decreased to reduce the programming current and consequently reduce voltage stress on peripheral circuits.
Solution Approach 2:
The system modifies the charge pump capacity parameter in response to changing input voltage conditions, optimizing the programming current output to match the actual requirements and minimize harmful voltage stress on connected circuits.
3Object-generated harmful factors
If a feedback mechanism and pump regulator are used to control the output voltage, then the peak-to-peak ripple control is improved, but the device complexity increases
Solution Approach 1:
A feedback mechanism is implemented where a feedback circuit generates a feedback signal based on the charge pump output voltage. A pump regulator compares this feedback signal with a reference voltage and generates a control signal that adjusts the charge pump operation to maintain stable output voltage and reduce ripple.
Solution Approach 2:
A voltage control unit is introduced as an intermediary component that receives the control signal from the pump regulator and generates the multi-phase clock signal for the charge pump. This intermediary structure organizes the control function and simplifies the overall system architecture.
Data Source
AI summary
An apparatus controlling peak-to-peak ripple in an output voltage may include; a charge pump unit configured to generate the output voltage in response to an input supply voltage, and a low voltage detector configured to generate a control signal, wherein the control signal defines the level of the input supply voltage.