Bilateral Op-Amp Current Source Switching for Disabled-Mode Error Reduction
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Solution Overview
Problem
High-voltage bilateral operational amplifiers experience significant error currents when not in use due to offset voltage, leading to unwanted output currents, which existing technologies fail to adequately mitigate.
Innovation Solution
A circuit configuration that includes a two-channel analog switch, allowing the operational amplifier to operate in a disabled mode by disconnecting the command signal from the inverting input and grounding the reference signal, thereby reducing error currents through the use of an enable signal to switch between normal and disabled modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the operational amplifier is left connected in normal mode, then it can respond quickly to commands, but significant error currents are generated at the output due to offset voltage
Solution Approach 1:
The patent implements a dynamic switching mechanism that changes the operational state of the operational amplifier based on system requirements. The analog switch allows the circuit to transition between normal mode (connected) and disabled mode (disconnected/grounded), optimizing performance for different operational phases while minimizing error currents during idle periods
Solution Approach 2:
The patent applies preliminary action by grounding the non-inverting input through the analog switch before the operational amplifier is needed for normal operation. This preliminary configuration reduces offset voltage effects and prevents error current generation during idle periods, preparing the circuit for accurate operation when activated
2Object-generated harmful factors
If a high-voltage switch is used to disconnect the operational amplifier, then error currents are reduced, but the device becomes expensive and bulky
Solution Approach 1:
The patent replaces expensive high-voltage switches with low-voltage analog switches that operate at logic-level voltages. Although these switches have limited voltage handling capability, they effectively control the operational amplifier's input connections, achieving error current reduction without requiring costly high-voltage switching components
Solution Approach 2:
The patent introduces an intermediary analog switch that mediates between the control logic and the operational amplifier inputs. This intermediary component grounds the non-inverting input during disabled mode, effectively reducing error currents without requiring direct high-voltage switching of the operational amplifier itself
Data Source
AI summary
Provided are embodiments that include a circuit configured to operate in a disabled mode error reduction for high-voltage bilateral operational amplifier current source. The circuit includes an operational amplifier, and a switching circuit coupled to the operation amplifier, wherein the switching circuit is operable in a normal mode and a disabled mode, wherein the disabled mode reduces error current at the output of the operational amplifier. Also provided are embodiments for a method for operating a circuit in a disabled mode for error reduction.