Inverted Doherty Amplifier Phase Correction for Wider Bandwidth
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Solution Overview
Problem
Conventional Doherty-type power amplifiers face inefficiencies due to parasitic elements causing phase shifts, leading to bandwidth reduction and increased insertion losses, particularly in 5G infrastructure base stations where power amplifiers need to efficiently handle rare high RF envelope signals.
Innovation Solution
The proposed inverted Doherty-type amplifier device incorporates a distribution network with phase correction networks to compensate for phase shifts caused by parasitic elements, using a driver circuit and phase correction networks to adjust signal phases, allowing for a combined signal with reduced energy loss and increased power added efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional Doherty-type power amplifiers are used, then signal amplification is achieved, but phase shifts caused by parasitic elements lead to bandwidth reduction and increased insertion losses
Solution Approach 1:
The patent applies preliminary anti-action by introducing phase correction networks that pre-compensate for phase shifts caused by parasitic elements before the signal proceeds through the amplifier. The phase correction networks are designed to provide opposite phase shifts that cancel out the harmful effects of parasitic capacitance and inductance, thereby maintaining bandwidth and reducing insertion losses without requiring redesign of the entire amplifier system.
Solution Approach 2:
The patent employs parameter changes by adjusting the phase characteristics of signal paths through configurable phase correction networks. These networks can dynamically modify phase parameters to compensate for parasitic effects, allowing the amplifier to maintain optimal performance across different operating conditions and bandwidth requirements while minimizing energy loss.
2Loss of energy
If phase correction networks are added to compensate for parasitic elements, then bandwidth is maintained and insertion losses are reduced, but device complexity increases
Solution Approach 1:
The patent uses phase correction networks as intermediary components that mediate between the input signal and the main amplifier stages. These networks act as intermediate phase-adjustment stages that correct parasitic-induced phase shifts without requiring fundamental changes to the core amplifier architecture, thereby managing complexity through modular addition rather than systemic redesign.
Solution Approach 2:
The patent applies segmentation by dividing the phase correction function into separate, modular networks that can be independently designed and configured for different signal paths. This segmentation allows the complex phase compensation task to be broken down into manageable units that can be optimized individually and combined to achieve overall system performance without overwhelming complexity.
3Loss of energy
If driver circuit is used in peak path, then power added efficiency is improved, but phase shift is introduced requiring additional phase correction
Solution Approach 1:
The patent merges the phase correction function with the driver circuit by integrating phase correction networks directly into the peak path driver stage. This combination allows the driver circuit to simultaneously perform both amplification and phase correction functions, reducing the need for separate phase adjustment components and managing the increased complexity through functional integration rather than addition of independent stages.
Data Source
AI summary
An inverted Doherty-type amplifier comprises a distribution network having a first input port; a main signal path coupled to a first output port of the distribution network, the main signal path comprising a main amplifier; a first peak signal path coupled to a second output port of the distribution network, the first peak signal path comprising a first phase adjustment network, a first peak amplifier having an input coupled to an output of the first phase adjustment network, and a second phase adjustment network having an input coupled to an output of the first peak amplifier; and a combining network coupled to an output of the main amplifier and an output of the second phase adjustment network.