Switched Capacitor Op-Amp Current Control for Lower Power
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Solution Overview
Problem
Switched capacitor circuits face a tradeoff between power consumption reduction and performance degradation, as the current in operational amplifiers is not effectively managed between sampling and integration modes, leading to excessive power usage.
Innovation Solution
Implementing a current controlling circuit that switches the current supply to the operational amplifier based on the open/close states of switching elements, reducing current during sampling mode and returning it to normal levels during integration mode, thereby optimizing power consumption without degrading performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the current flowing in the operational amplifier is reduced to lower power consumption, then power consumption is improved, but the performance of the circuit degrades
Solution Approach 1:
The patent applies dynamics by making the current flowing in the operational amplifier variable rather than fixed. The current value is changed according to the operating mode (sampling mode or integration mode) through control signals that adjust the current mirror circuit, allowing the system to adapt its power consumption to actual operational needs while maintaining performance when required.
Solution Approach 2:
The patent changes the current parameter of the operational amplifier based on operational requirements. By using control signals to adjust the current mirror circuit, the current flowing in the operational amplifier is modified according to whether the circuit is in sampling mode or integration mode, thereby optimizing power consumption without compromising performance when needed.
2Reliability
If the current flowing in the operational amplifier is increased to maintain performance, then circuit performance is improved, but power consumption increases
Solution Approach 1:
The patent makes the current dynamic by implementing control logic that adjusts the current mirror circuit based on the operational mode. During sampling mode, lower current is supplied to reduce power consumption, while during integration mode, higher current is provided to maintain performance, thus dynamically optimizing the trade-off between power and performance.
Solution Approach 2:
The current parameter is changed according to operational requirements. The control signal adjusts the current mirror circuit to provide appropriate current levels - reduced current during sampling mode to save power, and increased current during integration mode to maintain circuit performance, achieving parameter optimization based on operational context.
Data Source
AI summary
A switched capacitor circuit includes a capacitor and switches located on an input side and an output side of the capacitor. The switched capacitor circuit also includes an operational amplifier of a later stage which receives an output of the capacitor, wherein a current value of a current supplied to the operational amplifier is switched according to at least one open/closed state of at least one of the switches.