Amplifier Circuit With Asymmetric Power Split for Load Impedance Control
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Solution Overview
Problem
Existing amplifier circuits face challenges in setting the load impedance of the control amplifier to different values without affecting the system, particularly when attempting to make the powers and bias voltages of auxiliary amplifiers asymmetric.
Innovation Solution
The proposed amplifier circuit includes a first divider, a control amplifier, a second divider, two auxiliary amplifiers, and a combiner. The combiner delays the phase of one auxiliary amplifier's output by 90° and combines signals to achieve specific division ratios and phase differences, allowing the load impedance of the control amplifier to be set differently without requiring asymmetric bias voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If asymmetric bias voltages are supplied to the two auxiliary amplifiers to make their powers different, then the load impedance of the control amplifier can be set to different values, but the system complexity increases and the bias voltage supply becomes more complex
Solution Approach 1:
The patent applies asymmetry by making the powers of the two auxiliary amplifiers different from each other, while maintaining symmetric bias voltage supply. This is achieved through asymmetric power allocation (first auxiliary amplifier power ≠ second auxiliary amplifier power) while keeping the bias voltages equal, thereby resolving the contradiction between load impedance flexibility and bias voltage complexity
Solution Approach 2:
The patent changes the power parameter of the auxiliary amplifiers rather than the bias voltage parameter. By adjusting the power levels of the first and second auxiliary amplifiers to be different while maintaining equal bias voltages, the system achieves variable load impedance for the control amplifier without increasing bias voltage supply complexity
2Adaptability or versatility
If the powers of the two auxiliary amplifiers are made different to achieve asymmetric operation, then the load impedance can be adjusted, but additional components and circuitry are required
Solution Approach 1:
The patent makes the bias voltage supply circuit universal by supplying the same bias voltage to both auxiliary amplifiers. This multi-functional approach allows the bias supply to serve both amplifiers identically while the power adjustment mechanism handles the asymmetry, reducing the need for separate bias voltage supply circuits for each amplifier
3Power
If asymmetric bias voltages are used to differentiate the auxiliary amplifiers, then power differentiation is achieved, but the overall system performance and efficiency are reduced
Solution Approach 1:
The patent changes the power parameter of the auxiliary amplifiers through symmetric bias voltage supply, achieving power differentiation without the negative effects of asymmetric bias voltages. The first auxiliary amplifier operates at a different power level than the second, but both receive equal bias voltages, maintaining system reliability and efficiency
Data Source
AI summary
An amplifier circuit includes a first divider dividing an input signal into first and second signals, a control amplifier outputting a third signal, a second divider dividing the second signal into fourth and fifth signals, a first auxiliary amplifier outputting a sixth signal, a second auxiliary amplifier outputting a seventh signal, and a combiner including first to fourth ends, wherein the amplifier circuit satisfies at least one of conditions a) to c), a) in the combiner, a first division ratio of amplitudes of powers of signals output to the fourth and the third ends is 0.5 dB or more, b) a second division ratio of amplitudes of powers of divided signals in the second divider is 0.5 dB or more, and c) a phase difference between the sixth and the seventh signals is 85° or less or 95° or more.