Feedback Amplifier Circuit for Switchable Gain and Linearity
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Solution Overview
Problem
Existing amplifier circuits cannot dynamically switch between high-gain and high-linearity modes based on their use state, limiting their adaptability and efficiency.
Innovation Solution
An amplifier circuit with a feedback circuit that includes variable impedance elements and switches, allowing for selective connection of passive elements such as resistors, capacitors, and inductors to adjust feedback levels, enabling switching between high-gain and high-linearity modes, and potentially incorporating multiple transistors and bias circuits to further control gain and linearity characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a feedback circuit with fixed impedance is used, then the circuit structure is simple, but the gain and linearity characteristics cannot be switched based on use state
Solution Approach 1:
The feedback circuit incorporates switches that enable dynamic reconfiguration of the feedback path impedance. By controlling the switch states, the feedback amount can be adjusted between different levels, allowing the amplifier to switch between high-gain mode and high-linearity mode based on operational requirements, thus resolving the contradiction between adaptability and structural simplicity.
Solution Approach 2:
The patent changes the impedance parameter of the feedback circuit by selectively connecting different passive elements (resistors, capacitors, inductors) through switches. This parameter variation allows the feedback amount to be adjusted, enabling mode switching between high gain and high linearity while maintaining a relatively simple circuit structure based on a single feedback path.
2Adaptability or versatility
If multiple feedback paths are added to enable mode switching, then gain and linearity can be adjusted, but the circuit complexity increases
Solution Approach 1:
The feedback circuit is segmented into multiple impedance elements (resistors, capacitors, inductors) that can be independently controlled by switches. This segmentation allows different portions of the feedback path to be activated or deactivated, enabling flexible adjustment of feedback amount and mode switching without requiring completely separate feedback paths, thus reducing overall circuit complexity.
Solution Approach 2:
A single feedback path is designed to serve multiple functions by incorporating switches and multiple passive elements. The same feedback path can operate in different configurations to provide high-gain mode, high-linearity mode, or intermediate modes, eliminating the need for multiple dedicated feedback paths and reducing circuit complexity while maintaining adaptability.
Data Source
AI summary
An amplifier circuit includes a first transistor including a signal input portion into which a signal is input from the outside, and a load inductor connected between the first transistor and a power supply line. In addition, the amplifier circuit includes a feedback circuit, which is connected between any position between the load inductor and the first transistor and the signal input portion of the first transistor. The gain and linearity are determined as appropriate in accordance with the amount of feedback from this feedback circuit.