Parallel Amplifier Circuit With Shared VBW and Asymmetric Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In amplifier circuits with multiple amplifiers connected in parallel, providing a Video Bandwidth (VBW) circuit for each amplifier increases circuit size, while providing a single VBW circuit common to all amplifiers deteriorates characteristics.
Innovation Solution
An amplifier circuit design that includes a divider to split the input signal, two amplifiers, a combiner to combine their outputs, and a processing circuit that allows low-frequency signals to pass through a reference potential, with a coupling degree between the first node and the input node being greater than between the second node and the input node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a VBW circuit is provided for each amplifier in parallel, then low-frequency signal suppression is improved, but circuit size increases
Solution Approach 1:
The patent combines multiple VBW circuits into a single shared VBW circuit that serves multiple amplifiers. The processing circuit is configured to receive signals from multiple amplifiers and suppress low-frequency components collectively, thereby achieving the same low-frequency suppression effect while reducing the overall circuit size and component count.
Solution Approach 2:
The processing circuit is designed with multi-functionality to handle signals from multiple amplifiers simultaneously. It performs low-frequency suppression for all connected amplifiers through a single circuit instance, making the VBW function universal across the amplifier system rather than requiring dedicated circuits for each amplifier.
2Area of stationary object
If a single VBW circuit is provided common to all amplifiers, then circuit size is reduced, but signal processing characteristics deteriorate
Solution Approach 1:
The processing circuit incorporates individual processing paths or selectively configurable processing stages for each amplifier signal. This allows the single shared circuit to maintain optimal signal processing characteristics for each amplifier by applying tailored suppression parameters or processing methods to each input signal before combining the processed outputs.
Solution Approach 2:
The processing circuit is segmented into multiple independent processing channels, each handling the signal from a specific amplifier. This segmentation enables the circuit to process multiple amplifier signals simultaneously with appropriate individual characteristics while still using a single shared VBW circuit structure, thus maintaining signal integrity.
3Reliability
If coupling degree between first node and input node is increased, then low-frequency signal suppression is improved, but insertion loss in operating band increases
Solution Approach 1:
The processing circuit dynamically adjusts coupling parameters or impedance values based on frequency. By changing the coupling degree parameter according to the input signal frequency, the circuit achieves strong coupling (high suppression) for low-frequency signals while maintaining weak coupling (low insertion loss) for operating band frequencies, thus resolving the contradiction between suppression effectiveness and signal loss.
Data Source
AI summary
An amplifier circuit includes a divider that divides an input signal into a first signal and a second signal, a first amplifier that amplifies the first signal and output a third signal to a first node, a second amplifier that amplifies the second signal and outputs a fourth signal to a second node, a combiner that combines the third signal and the fourth signal and outputs a combined signal to an output terminal as an output signal, and a processing circuit that includes an input node to which the first and the second nodes are electrically coupled, and allows a signal having a frequency lower than an operating band of the first amplifier and the second amplifier to pass through a reference potential, wherein a coupling degree between the first node and the input node is larger than a coupling degree between the second node and the input node.