Open-Loop Transconductance Amplifier with Parallel Calibration
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Solution Overview
Problem
Conventional transconductance amplifiers struggle to support high-bandwidth and rapid transient responses without significantly increasing circuit board area.
Innovation Solution
A dual amplifier architecture is employed, where one amplifier performs transconductance operations while the other performs calibration phases, including auto-zeroing and gain offset correction, in an open loop configuration, allowing for parallel operation and reduced input offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional transconductance amplifier designs are used to support high-bandwidth and rapid transient responses, then performance requirements are met, but circuit board area is unreasonably expanded
Solution Approach 1:
The transconductance amplifier is divided into two separate amplifiers: a first transconductance amplifier and a second transconductance amplifier. Each amplifier handles specific functions (transconductance operation and calibration operations respectively), allowing the system to achieve high-bandwidth performance without requiring a single large amplifier circuit, thus reducing overall circuit board area.
Solution Approach 2:
The system alternates between transconductance operation phase and calibration phase in a periodic manner. During the transconductance operation phase, the first amplifier converts voltage to current while the second performs calibration. This periodic switching enables continuous operation with minimal transient effects while maintaining high bandwidth without requiring excessive circuitry.
2Duration of action of stationary object
If calibration operations are performed during transconductance operation, then continuous operation is achieved, but measurement precision deteriorates due to transient effects
Solution Approach 1:
The system implements periodic calibration phases that occur alternately with transconductance operation phases. During each transconductance operation phase, the amplifier is dedicated solely to voltage-to-current conversion without calibration interference, ensuring measurement precision. The calibration phase occurs in the alternate period, allowing continuous operation while preventing transient effects from degrading measurement accuracy.
Solution Approach 2:
By using two amplifiers that operate in complementary phases, the system maintains continuous useful action - one amplifier always performs transconductance operation while the other performs calibration, or vice versa. This ensures uninterrupted operation without the need for the same amplifier to switch between functions that would cause transients and precision loss.
Data Source
AI summary
Some examples of the disclosure are directed to systems and methods for calibrating and operating transconductance amplifiers for high-bandwidth applications configured in open loop configurations. Some examples of the disclosure are directed to setting a gain of the transconductance amplifiers based upon a value of an output load. Some examples of the disclosure are directed to using auto-zeroing circuitry and gain correction circuitry to modify a biasing of a transconductance amplifier.