Amplifier Switch Distortion Compensation With Dual Capacitor Banks
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Solution Overview
Problem
Amplifier circuits experience voltage distortions due to the nonlinearity of switches, particularly N-type FETs, which create unwanted distortion products at the switch terminals, affecting signal processing.
Innovation Solution
Implementing two programmable capacitor banks coupled to opposing terminals of a switch, with a controller to adjust their capacitances, allowing the circuit to operate in high and low gain modes to compensate for switch nonlinearity and maintain output voltage within specified ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switch is used in the amplifier circuit to enable the capacitor voltage divider, then the amplifier can operate in different gain modes, but voltage distortions are introduced due to the nonlinearity of the switch
Solution Approach 1:
The patent applies distortion compensation techniques that convert the harmful nonlinear effects of the switch into beneficial corrections. By measuring the distortion introduced by the switch and applying compensating signals, the system transforms the harmful distortion into a corrected output, maintaining signal fidelity while enabling gain mode switching through the capacitor voltage divider.
Solution Approach 2:
The patent changes operational parameters to minimize distortion effects. By adjusting operating points, signal levels, and compensation parameters based on the switch state, the system optimizes performance across different gain modes while reducing the impact of switch nonlinearity on signal quality.
2Ease of operation
If the capacitor voltage divider is enabled to adjust amplifier gain, then gain control is achieved, but switch nonlinearity creates unwanted distortion products at the switch terminals
Solution Approach 1:
The patent introduces intermediary compensation circuits and control mechanisms that mediate between the switch and the signal path. These intermediary elements measure and compensate for distortion products generated by the switch, allowing gain control through the capacitor voltage divider while filtering out the harmful nonlinear effects at the switch terminals.
3Device complexity
If a single capacitor bank is used for gain control, then the circuit is simple, but it cannot compensate for distortions at both switch terminals
Solution Approach 1:
The patent segments the capacitor control into separate programmable capacitor banks for each switch terminal. This segmentation allows independent adjustment of capacitance values at each terminal, enabling precise compensation for distortions generated at both sides of the switch while maintaining manageable circuit complexity through modular design.
Data Source
AI summary
An amplifier circuit that includes a capacitor voltage divider that is selectively enabled with a switch. The circuit includes two capacitor banks where the banks are electrically coupled to opposing side terminals of the switch. When the capacitor voltage divider is not enabled, one bank is adjusted to control the gain of the amplifier. When the capacitor voltage divider is enabled, both banks are used to control the gain of the amplifier.