Variable-Transconductance Amplifier Circuit for Stable Distributed Gain
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Solution Overview
Problem
Existing amplifier circuits experience variations in gain due to signal attenuation in power distribution, leading to inconsistent performance.
Innovation Solution
An amplifier circuit design incorporating a first amplifier with variable transconductance, a power distributor, and series-connected switches that bypass the power distributor, with differing input and output impedances, to maintain consistent gain across operation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power distributor is used to distribute the signal from the low noise amplifier, then the signal can be distributed to multiple receivers, but signal attenuation occurs and gain varies
Solution Approach 1:
The amplifier's transconductance is made variable through dynamic control, allowing the gain to be adjusted in real-time. When the power distributor is connected, the transconductance increases to compensate for signal attenuation, maintaining consistent output gain regardless of the distribution state
Solution Approach 2:
The invention changes the transconductance parameter of the amplifier based on the connection state of the power distributor. By detecting whether the power distributor is connected and adjusting the transconductance accordingly, the system maintains stable gain performance while enabling signal distribution to multiple receivers
2Reliability
If the low noise amplifier is directly connected to the receiver, then gain is high and signal attenuation is minimal, but the receiver cannot be switched between direct connection and power distributor connection
Solution Approach 1:
The amplifier dynamically adjusts its transconductance based on the switching state between direct connection and power distributor connection. This dynamic parameter adjustment ensures that the amplifier adapts to different connection modes while maintaining consistent performance
Solution Approach 2:
The amplifier is designed with multi-functionality to operate effectively in both direct connection mode and power distributor connection mode. By incorporating variable transconductance control, the single amplifier can serve both purposes with optimized performance in each mode
Data Source
AI summary
An amplifier circuit includes an amplifier including a common drain or a common collector having variable transconductance, a power distributor connected to an output side of the amplifier, and a switch arranged in series on a bypass path, which branches from a path with which the amplifier is connected to the power distributor, bypasses the power distributor, and is joined to an output of the power distributor. Input impedance (Zin) of the power distributor has a value different from that of output impedance (Zout1) of the power distributor.