Amplifier Dummy Transistors Inductance Uniformity
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Solution Overview
Problem
Existing amplifiers face challenges in maintaining uniform signal phase and amplitude due to manufacturing variations and fluctuations in temperature or operating power, leading to non-uniform inductance distribution and decreased RF output gain.
Innovation Solution
The amplifier design includes input and output matching circuits with a row arrangement of amplifying transistors flanked by dummy transistors, which do not contribute to output power, to stabilize inductance distribution and phase uniformity by blocking signals from dummy transistors at both ends, using interruption circuits like LC matching circuits and choke coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dummy transistors are added at both ends of the amplifying transistor row, then phase uniformity is improved, but device complexity increases
Solution Approach 1:
Dummy transistors are introduced as intermediary elements at both ends of the amplifying transistor row. These dummy transistors act as mediators that provide consistent inductance values at the terminal positions, compensating for the inherent inductance non-uniformity that would otherwise occur at the ends of the transistor array. This intermediary structure ensures that all amplifying transistors experience uniform inductance conditions, thereby improving phase uniformity across the output signals.
2Productivity
If the number of transistors is increased to improve output power, then productivity is improved, but inductance distribution uniformity deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the roles of transistors at different positions within the array. Amplifying transistors in the middle positions are optimized for power output, while dummy transistors at the terminal positions are specifically designed to provide consistent inductance values. This localized functional differentiation ensures that each position contributes optimally to the overall performance, maintaining inductance distribution uniformity even as the total number of transistors increases for higher output power.
Data Source
AI summary
Provided are an input matching circuit, at least one amplifying transistor that receives a signal from the input matching circuit, a first dummy transistor that receives a signal from the input matching circuit, a second dummy transistor that receives a signal from the input matching circuit, and an output matching circuit that outputs an output of the amplifying transistor, the amplifying transistor being arranged between the first dummy transistor and the second dummy transistor, the amplifying transistor, the first dummy transistor, and the second dummy transistor being provided in a row along the input matching circuit.