Multistage Amplifier Distortion Compensation With Shared Lookup Control
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Solution Overview
Problem
Conventional multistage amplifier apparatuses experience increased circuit scale, manufacturing costs, and power consumption due to the need for multiple conversion circuits and look-up tables to provide optimal driving conditions for each amplifier, leading to inefficient distortion compensation.
Innovation Solution
A multistage amplifier apparatus with N serially connected amplifiers and M distortion compensation apparatuses, where M<N, each retaining a distortion compensation table to provide correlated voltages for optimal amplifier operation, reducing the need for conversion circuits and look-up tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple conversion circuits and look-up tables are provided for each amplifier to achieve optimal driving conditions, then distortion compensation performance is improved, but circuit scale and manufacturing complexity increase
Solution Approach 1:
The patent combines multiple conversion circuits into a single conversion circuit that serves all amplifiers in the multistage configuration. Instead of providing separate conversion circuits and look-up tables for each amplifier, one conversion circuit processes the input signal and generates control signals for multiple amplifiers, thereby reducing circuit scale while maintaining distortion compensation performance
Solution Approach 2:
The single conversion circuit is designed to perform multiple functions by generating control signals for multiple amplifiers simultaneously. The circuit provides universal distortion compensation across all amplifier stages, eliminating the need for dedicated conversion circuits for each amplifier while achieving optimal driving conditions for the entire multistage system
2Reliability
If multiple conversion circuits and look-up tables are provided for each amplifier, then distortion compensation is improved, but power consumption increases
Solution Approach 1:
The patent merges multiple power-consuming conversion circuits into a single conversion circuit. This consolidation reduces the total power consumption while maintaining the ability to provide optimal driving conditions for all amplifiers in the multistage configuration, as the single circuit processes signals for all stages
3Manufacturing precision
If multiple look-up tables are provided for each amplifier, then distortion compensation accuracy is improved, but manufacturing costs increase
Solution Approach 1:
The patent combines multiple look-up tables into a single look-up table that serves all amplifiers. This single look-up table contains the necessary correction data for distortion compensation across all amplifier stages, reducing manufacturing complexity and cost while maintaining high distortion compensation accuracy
Solution Approach 2:
The single look-up table is designed to provide universal distortion compensation data for multiple amplifier stages. This multi-functional approach maintains high compensation accuracy across all stages while significantly reducing the number of components that need to be manufactured and assembled
Data Source
AI summary
Provided are an amplifier section in which N amplifiers (N is an integer of 2 or more) are serially connected to one another, and which performs an amplitude modulation on an input signal using an amplitude signal, which is a control signal; and M distortion compensation apparatuses (M is a natural number satisfying M<N) which are respectively provided to M amplifiers of the N amplifiers, each of which retains a distortion compensation table in which a voltage of the amplitude signal and a distortion compensated voltage are correlated with each other, and provides the distortion compensated voltage which is correlated with the control signal, to a power supply terminal of a corresponding amplifier of the M amplifiers in accordance with the distortion compensation table. To power supply terminals of (N−M) amplifiers of the N amplifiers, to which the distortion compensated voltage is not inputted by any of the M distortion compensation apparatuses, the voltage of the power supply terminal is directly provided.