Time-Multiplexed Amplifier Offset Compensation With Shared Calibrator
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Solution Overview
Problem
Conventional methods for correcting input referred offset voltage in operational amplifiers are inefficient, leading to amplification errors and increased design complexity, space consumption, and costs due to the need for large resistor chains, auxiliary amplifiers, and complex clock circuits.
Innovation Solution
A system comprising a first and second amplifier, a compensation-setting generator, and a controller that applies generated compensation settings to each amplifier to continuously correct input referred offset voltage, using a single compensation-setting generator to reduce circuit complexity and cost by sharing a compensator between multiple amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods use large resistor chains and iDAC to minimize input referred offset, then offset correction accuracy is improved, but space consumption increases and manufacturing cost increases
Solution Approach 1:
The patent merges multiple offset correction functions into a single shared compensator that serves multiple amplifiers. The compensator generates compensation settings that are applied to multiple amplifiers sequentially, eliminating the need for separate correction circuits for each amplifier. This reduces the overall circuit area while maintaining offset correction accuracy through time-multiplexed operation.
Solution Approach 2:
The shared compensator is designed to perform offset correction for multiple different amplifiers using the same hardware resources. By implementing a universal compensation mechanism that can serve multiple amplifiers through time-multiplexed operation, the patent reduces space consumption while maintaining correction accuracy across all amplifiers.
2Reliability
If conventional methods use auxiliary amplifiers for sensing and correcting offset voltage, then offset correction capability is improved, but device complexity increases and space consumption increases
Solution Approach 1:
The patent combines the offset correction functionality into a single shared compensator that replaces multiple auxiliary amplifiers. This consolidates the correction capability while reducing design complexity, as the single compensator uses standardized circuitry rather than requiring separate auxiliary amplifiers for each target amplifier.
Solution Approach 2:
The shared compensator implements a universal offset correction mechanism that can correct multiple amplifiers using the same hardware structure. This multi-functional approach eliminates the need for dedicated auxiliary amplifiers for each target amplifier, significantly reducing device complexity while maintaining correction capability.
3Ease of operation
If conventional methods use dedicated clock circuits for auxiliary amplifiers operating between auto zero phase and amplification phase, then phase switching control is improved, but device complexity increases
Solution Approach 1:
The patent merges the clocking requirements for phase switching into a single shared control mechanism. The compensator uses a common clock signal to coordinate auto-zero and amplification phases across multiple amplifiers, eliminating the need for separate dedicated clock circuits for each auxiliary amplifier.
Solution Approach 2:
The shared compensator implements a universal phase switching control mechanism that serves multiple amplifiers with a single clock infrastructure. This multi-functional clocking approach reduces device complexity by consolidating timing control resources while maintaining proper phase switching for all amplifiers.
4Area of stationary object
If a single shared compensator is used for multiple amplifiers, then space consumption is reduced and device complexity is reduced, but requires time-multiplexed operation
Solution Approach 1:
The patent implements periodic action by cyclically updating compensation settings for different amplifiers in time-multiplexed fashion. The shared compensator alternates between generating compensation settings for different amplifiers at regular intervals, ensuring each amplifier receives updated compensation while maintaining high overall productivity through efficient time utilization.
Solution Approach 2:
The system dynamically switches between serving different amplifiers through time-multiplexed operation. The compensator adaptively allocates its resources to different amplifiers based on timing signals, maintaining space efficiency while ensuring each amplifier receives timely compensation updates through dynamic resource allocation.
Data Source
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AI summary
An apparatus includes a first amplifier, a second amplifier, and a compensation-setting generator to generate a first amplifier compensation setting and second amplifier compensation setting. A controller is operable to: i) apply the first amplifier compensation setting to the first amplifier and apply the second amplifier compensation setting to the second amplifier. The controller is further operable to switch between generating updates to the first amplifier compensation setting and the second amplifier compensation setting.