Analog Operation Circuit for Capacitor-Based Multiply-Divide
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Solution Overview
Problem
Existing digital circuits and hardware for multiplication and division operations are complex and cumbersome.
Innovation Solution
An operation circuit utilizing a capacitor charging/discharging module and an error amplification module to perform multiplication and division operations of electrical signals, where all signals are analog, and the target signal is proportional to the product of the first and second signals divided by the third signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital circuits are used for multiplication and division operations, then calculation precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces digital circuit operations with an analog physical process using capacitor charging and discharging. The multiplication and division operations are performed by controlling the charging/discharging rates of capacitors with input currents, and the results are obtained through voltage measurements, eliminating the need for complex digital logic circuits.
Solution Approach 2:
The patent changes the operating parameters from digital domain to analog domain. By using continuous voltage and current signals instead of discrete digital values, and by utilizing the continuous charging/discharging process of capacitors, the system achieves mathematical operations with simpler hardware while maintaining calculation precision.
2Measurement precision
If analog-to-digital conversion is performed before digital multiplication, then calculation precision is improved, but loss of time increases
Solution Approach 1:
The patent eliminates the analog-to-digital conversion step by performing multiplication operations directly in the analog domain. Capacitors are charged or discharged by input currents, and the resulting voltages directly represent the multiplication result, removing the time-consuming ADC conversion process entirely.
3Measurement precision
If digital dividers based on subtraction are used, then division operation is achieved, but device complexity increases
Solution Approach 1:
The patent replaces complex digital subtraction-based division circuits with an analog process using capacitor charging/discharging. The division operation is performed by controlling the charging/discharging rates with input currents and measuring the resulting voltages, which directly represent the quotient without requiring complex iterative subtraction logic.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simple and efficient multiplication and division operations using stepwise approximation, facilitating flexible use in various circuits.
Implementation Method 1
a first terminal of the first switch, a first terminal of the first capacitor and a negative input terminal of the first comparator are electrically connected to an output terminal of the first current source to receive the first signal
Data Source
AI summary
An operation circuit and a chip pertaining to the field of integrated circuit design technology are disclosed by the present application. The circuit includes a capacitor charging/discharging module and an error amplification module electrically connected to the capacitor charging/discharging module. The capacitor charging/discharging module is configured to receive a first signal and a third signal that are external to the capacitor charging/discharging module and to output a feedback signal. The error amplification module is configured to receive the feedback signal and a second signal that is external to error amplification module and to output, based on the received feedback and second signals, a target signal to the capacitor charging/discharging module. In a steady state, values of the target, first, second and third signals satisfy a predefined mathematical relationship.