I-V Conversion Module With Pre-Integral Circuit
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Solution Overview
Problem
Existing I-V conversion modules have longer response times and high power consumption due to the low-frequency open-loop gain and bandwidth of the inverting amplifier, which increases the gain-bandwidth product but results in excessive power usage.
Innovation Solution
The I-V conversion module incorporates a pre-integral circuit and a charge transfer auxiliary circuit, allowing for pre-integration of induction currents and efficient transfer of pre-integral charges using the gain-bandwidth product of the inverting amplifier, reducing the time required for output voltage establishment and lowering power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the gain-bandwidth product of the inverting amplifier is increased to reduce response time, then the response time is improved, but the power consumption increases significantly
Solution Approach 1:
The patent applies preliminary action by introducing a pre-integral circuit that performs integration before the main I-V conversion stage. The pre-integral circuit accumulates charge during a pre-integration period, so that when the main conversion occurs, the amplifier doesn't need to respond as quickly, allowing for lower gain-bandwidth product and reduced power consumption while maintaining fast overall response
Solution Approach 2:
The patent segments the I-V conversion process into two distinct stages: a pre-integration stage handled by the pre-integral circuit and a main conversion stage handled by the I-V transformation circuit. This segmentation allows each stage to operate at optimized parameters, with the pre-integral circuit handling the time-critical charge accumulation and the main circuit performing the voltage conversion at lower power consumption
2Speed
If the open-loop gain and bandwidth of the inverting amplifier are increased to meet response time requirements, then the response time is improved, but the power consumption increases by 4 times for every 2 times increase in gain-bandwidth product
Solution Approach 1:
The pre-integral circuit performs preliminary charge accumulation during a dedicated pre-integration period controlled by clock signals. This preliminary action prepares the charge in advance, allowing the main I-V conversion to occur more slowly and at lower power consumption while still achieving fast overall response time
Solution Approach 2:
The patent employs periodic action through clock-controlled switching between pre-integration mode and conversion mode. The non-overlapping clocks φ1 and φ2 periodically switch the pre-integral circuit between accumulating charge and transferring it to the main circuit, enabling the system to achieve fast response through periodic charge preparation rather than requiring continuously high-power amplifier operation
Data Source
AI summary
An I-V conversion module includes: a current output type sensor, a pre-integral circuit, a charge transfer auxiliary circuit, and an I-V transformation circuit including an inverting amplifier. The current output type sensor is connected to an input end of the I-V transformation circuit through the pre-integral circuit. The charge transfer auxiliary circuit connects in parallel with the inverting amplifier. When both the pre-integral circuit and the charge transfer auxiliary circuit are open circuits, the pre-integral circuit pre-integrates the induction current output by the current output type sensor to store pre-integral charges. When both pre-integral circuit and the charge transfer auxiliary circuit are closed circuits, the pre-integral charges are transferred to the I-V transformation circuit. In these embodiments, both the time for establishing the I-V conversion module and power consumption can be reduced.