Dynamic Comparator Offset Compensation Without Signal Path Interruption
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Solution Overview
Problem
Existing methods for offset voltage compensation in electronic circuits often require interrupting the signal path, increasing power consumption, and limiting the maximum operating speed, especially in high-speed devices.
Innovation Solution
A circuit comprising a dynamic comparator, phase detector, finite-state machine, and digital-analog converters that compensates offset voltage by generating an additional voltage with opposite polarity, without interrupting the signal path, using a polarization block to modify the polarization current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional offset compensation methods are used, then offset voltage is compensated, but the signal path is interrupted and operating speed is reduced
Solution Approach 1:
The patent implements continuous offset compensation by processing calibration signals during normal operation without interrupting the signal path. The system continuously adjusts polarization currents based on real-time phase detection, eliminating the need to stop signal transmission for calibration routines.
Solution Approach 2:
The patent dynamically changes electrical parameters (polarization currents) to compensate for offset voltage. By adjusting the polarization currents through digital-to-analog converters based on phase detector feedback, the system modifies circuit parameters continuously to maintain optimal operation without interrupting signal flow.
2Measurement precision
If additional trajectories are added for offset compensation, then offset voltage is compensated, but power consumption and implementation cost increase
Solution Approach 1:
The patent makes existing circuit components perform multiple functions. The polarization blocks and signal paths are used both for normal signal transmission and for offset compensation calibration, eliminating the need for separate dedicated calibration trajectories and reducing overall power consumption.
Solution Approach 2:
The system uses its own existing infrastructure (signal paths, polarization blocks, phase detectors) to perform offset compensation without requiring external or additional dedicated calibration circuits. The calibration process is self-contained within the existing circuit architecture.
3Measurement precision
If impedance compensation circuits are used, then offset voltage is compensated, but extra load is added to circuit input and maximum operating speed is affected
Solution Approach 1:
The patent compensates for offset voltage by changing polarization current parameters rather than adding impedance-matching components. This approach adjusts electrical parameters software-controlledly without adding physical load to the circuit input, maintaining simplicity and high-speed operation.
Data Source
AI summary
The present invention corresponds to a method and a circuit for compensating the offset voltage of electronic circuits, where the circuit implementing the method comprises: a dynamic comparator (1); a phase detector (6) connected to the dynamic comparator (1), the phase detector (6); a finite-state machine (9) connected to the phase detector (4), a first digital-analog converter (12) connected to an output of the finite-state machine (9); a second digital-analog converter (13) connected to another output (11) of the finite-state machine (9); a polarization block (14) with a first input (15) connected to the output of the first digital-analog converter (12) and a second input (16) connected to the output of the second digital-analog converter (13); where the polarization block (14) polarizes an electronic circuit (17) and the dynamic comparator (1), the phase detector (6), and the finite-state machine (9) are connected to a clock signal (3). The method is characterized by the following steps: a) connecting a dynamic comparator to the output of the electronic circuit; b) measuring the phase change of the dynamic comparator outputs of step a by means of a phase detector; c) controlling the output signals of a finite-state machine according to the phase detector output of step b, which can be coded “forward”, “backward” or “in phase”; c) converting the output of the finite-state machine of step c to an analog signal using two digital-analog converters; d) connecting the output of the two digital-analog converters of step d to the control terminal of the electronic circuit polarization block; and, e) modifying the polarization current of the electronic circuit polarization block by means of the output signals of the two digital-analog converters connected in step e.