Amplifier Bypass Circuit With Capacitive Impedance Matching
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Solution Overview
Problem
The existing amplifier circuit disclosed in Japanese Unexamined Patent Application Publication No. 2021-35016 fails to achieve sufficient impedance matching when the bypass path is used, resulting in signal loss.
Innovation Solution
The amplifier circuit includes a low noise amplifier in an amplification path, with switches and capacitors configured in the bypass path to connect it to ground, allowing impedance matching and reducing signal loss by disconnecting the bypass path from the amplification path and stabilizing the bypass path's potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bypass path is used without additional components, then the circuit complexity is reduced, but the impedance matching is insufficient and signal loss occurs
Solution Approach 1:
A capacitor is introduced as an intermediary component in the bypass path to achieve impedance matching. The capacitor acts as a mediator between the bypass path and ground, enabling proper signal transmission without requiring complex circuit modifications, thus reducing signal loss while maintaining relatively simple circuit architecture.
Solution Approach 2:
The impedance characteristics of the bypass path are modified by adding a capacitor, which changes the electrical parameters of the path. This parameter change enables the bypass path to achieve proper impedance matching, thereby reducing signal loss when the bypass mode is activated.
2Loss of energy
If the bypass path is disconnected from ground, then the impedance matching improves, but the noise suppression capability deteriorates
Solution Approach 1:
The capacitor serves as an intermediary that provides a controlled coupling path to ground. Instead of directly connecting the bypass path to ground (which would suppress noise but affect impedance), the capacitor mediates the interaction, allowing noise suppression while maintaining proper impedance matching characteristics.
Solution Approach 2:
The capacitor is strategically placed at a specific location in the bypass path to provide localized noise suppression functionality. This local quality enhancement allows the bypass path to maintain its impedance matching characteristics while gaining noise suppression capability at the critical point where the capacitor is connected.
3Adaptability or versatility
If switches are added to control path switching, then the adaptability improves, but the device complexity increases
Solution Approach 1:
The circuit is designed to automatically switch between amplification and bypass paths based on the amplifier's operating state. The switching mechanism serves itself by utilizing the amplifier's own status signals to control the path selection, eliminating the need for external control circuits and reducing overall device complexity while maintaining adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces signal loss in both amplification and bypass modes by matching impedance and suppressing noise, thereby improving the overall performance of the amplifier circuit.
Implementation Method 1
a first capacitor having at least one end connected between the first switch and the second switch in the second path
Implementation Method 2
a third switch connected between the second path and a ground
Data Source
AI summary
An amplifier circuit includes a low noise amplifier disposed in an amplification path, switches connected in series to a bypass path bypassing the low noise amplifier, a capacitor having at least one end connected between the switches in the bypass path, and a switch connected between the bypass path and a ground. The switch connected between the bypass path and the ground is connected between the other switches.