Digitally Controllable Power Source Circuit for DC Offset Cancellation
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Solution Overview
Problem
Existing power source circuits face challenges in achieving accurate and controlled output power levels, particularly in analog signal processing, where DACs are often required to counter DC offsets, leading to increased design complexity and silicon area, and strict monotonicity in control algorithms.
Innovation Solution
A power source circuit with a digital controller and a power signal generation circuit that adjusts output power signals based on digital feedback signals, utilizing switching devices and capacitors to gradually change output current or voltage, eliminating the need for highly accurate DACs and thermometer coding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a DAC is inserted in the analog signal processing chain to counter DC offset, then accuracy in controlling current levels is improved, but device complexity and silicon area significantly increase
Solution Approach 1:
The patent segments the current control function into multiple discrete current sources that can be independently controlled by digital signals. Instead of using a complex DAC, the invention divides the total current into multiple segments that are switched and summed to achieve the desired current level, thereby reducing the need for high-precision DAC components
Solution Approach 2:
The patent replaces the traditional DAC (which requires complex analog circuitry and high precision components) with a digitally controlled current source system. The control is achieved through digital logic circuits that generate control signals for switching devices, substituting the mechanical/analog DAC approach with a digital control architecture
2Measurement precision
If a DAC is inserted in the analog signal processing chain to counter DC offset, then accuracy in controlling current levels is improved, but silicon area significantly increases
Solution Approach 1:
The patent segments the current control function into multiple discrete current sources that can be independently controlled by digital signals. Instead of using a complex DAC, the invention divides the total current into multiple segments that are switched and summed to achieve the desired current level, thereby reducing the need for high-precision DAC components
Solution Approach 2:
The patent uses multiple identical or similar current source circuits that can be replicated and arranged in parallel. This modular approach allows the system to achieve the desired current control range and precision by combining multiple copies of a simpler, smaller circuit block, reducing the overall silicon area compared to a single complex DAC
3Measurement precision
If traditional DAC control algorithms are used, then current control accuracy is achieved, but strict monotonicity of the DAC input-output relation is required
Solution Approach 1:
The patent implements a feedback mechanism where the output current is monitored and fed back to the digital control logic. This feedback allows the system to automatically adjust the control signals to maintain the desired current level, eliminating the need for complex control algorithms that enforce strict monotonicity. The feedback loop compensates for variations and ensures accurate current control through iterative adjustment
Solution Approach 2:
The patent enables the current control system to self-regulate through the feedback mechanism. The system automatically detects deviations from the desired current level and adjusts its own control signals without requiring external intervention or complex control algorithms. This self-service capability simplifies the control logic while maintaining accuracy
Data Source
AI summary
Embodiments of power source circuits and methods for operating a power source circuit are described. In one embodiment, a method for operating a power source circuit involves receiving at the power source circuit at least one digital signal from a feedback loop and increasing or decreasing an output power signal of the power source circuit in response to the at least one digital signal. Other embodiments are also described.