Doherty Amplifier Phase Delay Auto-Adjustment
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Solution Overview
Problem
Existing Doherty amplifiers face challenges in adjusting phase and delay differences between amplifier paths efficiently, requiring external measurement devices and lengthy manual adjustments to achieve optimal distortion characteristics.
Innovation Solution
A Doherty amplification device with an adjustment unit that automatically adjusts phase and delay values based on calculated statistical values from feedback and reference signals, using phase and delay tables to optimize gain characteristics across different power levels, significantly reducing adjustment time and eliminating the need for external measurement devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual adjustment with external measurement devices is used, then measurement precision can be achieved, but adjustment time and device complexity increase significantly
Solution Approach 1:
The Doherty amplifier performs self-adjustment of phase and delay values using its own feedback signal and reference signal, eliminating the need for external measurement devices. The adjustment unit calculates statistical values from internally available signals and automatically optimizes parameters, enabling the system to service itself without external intervention.
Solution Approach 2:
The invention utilizes the feedback signal already present in the Doherty amplifier system to perform measurements and adjustments. By processing the feedback signal through the adjustment unit, the system achieves precise measurement of distortion characteristics without requiring external measurement equipment, thus reducing both time and complexity.
2Measurement precision
If manual adjustment with external measurement devices is used, then measurement precision can be achieved, but device complexity increases
Solution Approach 1:
The system uses its own feedback signal for self-measurement and self-adjustment, eliminating external measurement devices and reducing overall system complexity. The adjustment unit processes internally available signals to determine optimal phase and delay values.
Solution Approach 2:
The feedback signal serves multiple functions: it is used for both amplification control and for measurement adjustments. This multi-functionality eliminates the need for separate measurement devices, reducing device complexity while maintaining measurement precision.
3Loss of time
If statistical value calculation from feedback signals is used, then adjustment time is reduced, but measurement precision may be compromised
Solution Approach 1:
The invention replaces manual iterative adjustment with automated statistical calculation based on feedback signal analysis. By calculating statistical values (mean, standard deviation) of phase and delay values from the feedback signal, the system rapidly determines optimal parameters without time-consuming manual trial-and-error, while maintaining precision through mathematical optimization.
Data Source
AI summary
A Doherty amplification device includes a distributor to distribute, into first and second signals, an input signal after distortion-compensation, first and second amplifiers, a combiner to combine the amplified first and second signals, and an adjuster between the distributor and the first or second amplifiers and to include a first calculation circuit to obtain a first-characteristic indicating a relationship of a gain of an output signal with respect to reference-power of the input signal, based on the output signal and the input signal, a classification circuit to classify the first-characteristic into regions according to the reference-power, a second calculation circuit to obtain a statistical-value of the gain for each regions, and a determination circuit to set, in the adjuster, a phase-delay at which distortion to be generated in the output signal is minimized, based on the statistical-value, wherein the adjuster adjusts the phase-delay of the first or second signals.