Float-Voltage DAC Circuit Using Indirect Current Superposition
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Solution Overview
Problem
Existing superposition operation circuits face challenges in achieving high precision with low input signal precision requirements while maintaining low power consumption, particularly in voltage superposition, where differences in input signals lead to nonlinear errors and inconsistencies.
Innovation Solution
A superposition operation circuit incorporating a current generation circuit and operational amplifiers that convert voltage signals to current signals, allowing for indirect current superposition, where the output point of the operational amplifier is fixed, ensuring high precision without the need for high-precision current inputs, thereby reducing power consumption and precision requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If direct voltage superposition is used with a dual-input operational amplifier, then the circuit is simple and consumes low power, but the output precision deteriorates when there is a large difference between input voltages due to nonlinear errors
Solution Approach 1:
The patent introduces a current generation circuit as an intermediary between the voltage input and the operational amplifier. This circuit converts voltage signals to current signals before superposition, allowing the operational amplifier to work with current inputs rather than directly with voltage inputs. This intermediary conversion resolves the nonlinear error problem while maintaining circuit simplicity.
Solution Approach 2:
The patent changes the operating parameter domain from voltage to current. By converting the input voltages to currents through the current generation circuit, and having the operational amplifier perform superposition in the current domain, the system achieves high precision without requiring high-precision current inputs, thus resolving the precision issue while keeping the circuit simple.
2Measurement precision
If indirect current superposition is used with a fixed output point, then output precision is improved, but the current input requires high precision which increases power consumption and complexity
Solution Approach 1:
The patent inverts the conventional approach by not requiring high-precision current inputs. Instead, it accepts low-precision voltage inputs, converts them to currents through the current generation circuit, and achieves high-precision output through the fixed output point superposition mechanism. This inversion of the precision requirement resolves the power consumption issue.
3Measurement precision
If high-precision current inputs are required for fixed output point superposition, then output precision is improved, but device complexity and area increase
Solution Approach 1:
The current generation circuit serves as an intermediary that handles the precision conversion. It accepts low-precision voltage inputs and generates the appropriate current signals for the fixed output point superposition, eliminating the need for high-precision current inputs and reducing overall circuit complexity.
Solution Approach 2:
The patent changes the input parameter from requiring high-precision current to accepting low-precision voltage. This parameter change, combined with the voltage-to-current conversion in the current generation circuit, achieves high output precision without increasing device complexity or area.
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
The solution achieves high-precision superposition with reduced input signal precision requirements and lower power consumption by converting low-absolute-precision voltage signals to high-precision current elements, ensuring output precision and minimizing power and area requirements in the current generation circuit.
Implementation Method 1
the current generation circuit is configured to convert the first voltage signal to a first current signal, convert the second voltage signal to a second current signal
Implementation Method 2
the first operational amplifier is configured to superpose the to-be-superposed analog element on a voltage drop on the first resistor
Data Source
AI summary
A superposition operation circuit and a float-voltage digital-to-analog conversion circuit to superpose analog elements according to an indirect current superposition principle, where a voltage follower is implemented using a first operational amplifier such that an output end of the voltage follower is clamped to a voltage that is input to a positive-phase input end, namely, a to-be-superposed analog element. Then a current generation circuit converts a voltage signal to a current signal, a voltage drop for the current signal is generated on a first resistor coupled to an output end of the first operational amplifier, and the voltage drop is superposed on a voltage signal output by the first operational amplifier.