Differential Doherty Power Amplifier With Phase-Offset Balun Paths
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Solution Overview
Problem
As the number of antennas in communication devices increases, the number of RF components, including power amplifiers, also increases, leading to complexity and inefficiency in signal processing.
Innovation Solution
The implementation of a differential two-stage Doherty power amplifier (PA) with driver amplification circuitry, phase offset circuitry, balun circuitry, and Doherty amplification circuitry, including carrier and peaking amplifier circuitry, to efficiently process signals in a single-ended scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas and RF components is increased to improve communication performance, then signal processing capability is improved, but device complexity and inefficiency increase
Solution Approach 1:
The patent combines multiple RF signal paths into a single differential signal path by merging the in-phase and quadrature paths through the phase offset circuitry and balun circuitry. This consolidation reduces the number of separate RF components needed while maintaining the capability to process multiple antenna signals, thereby improving signal processing capability without proportionally increasing device complexity
Solution Approach 2:
The differential two-stage Doherty power amplifier is designed to handle multiple signal paths (in-phase and quadrature) simultaneously through its balanced configuration. The circuitry can process multiple antenna inputs through a unified architecture, providing multi-functional capability that improves productivity while controlling complexity through resource sharing
2Productivity
If a differential two-stage Doherty PA is implemented with multiple RF paths, then signal processing capability is improved, but insertion loss and path loss increase
Solution Approach 1:
The patent merges the in-phase and quadrature signal paths into a single differential path using the phase offset circuitry and balun circuitry. This consolidation reduces the number of signal transitions and component interfaces, thereby reducing insertion loss and path loss while maintaining the ability to process multiple antenna signals
Solution Approach 2:
The patent extracts and eliminates redundant components from traditional multi-path RF architectures by using the phase offset circuitry to directly convert quadrature signals into differential signals. This removal of unnecessary intermediate components reduces signal loss while preserving signal processing capability
3Adaptability or versatility
If traditional multi-path RF architecture is used, then signal processing flexibility is maintained, but power amplifier efficiency decreases
Solution Approach 1:
The patent combines multiple RF signal paths into a single differential signal path that feeds into the two-stage Doherty power amplifier. This merging reduces the total power consumption associated with maintaining multiple separate RF paths while the differential configuration and phase offset circuitry preserve signal processing flexibility for handling multiple antenna inputs
Solution Approach 2:
The patent changes the signal representation from separate in-phase and quadrature paths to a unified differential signal format. This parameter change in signal architecture improves power amplifier efficiency by reducing redundant power consumption while the phase offset circuitry maintains the ability to process various signal types and antenna configurations
Data Source
AI summary
In various embodiments, circuitry is provided. The circuitry may comprise: driver amplification circuitry, phase offset circuitry, balun circuitry, carrier amplifier circuitry, and peaking amplifier circuitry. The phase offset circuitry may comprise a first line connected to the driver amplification circuitry and configured to provide a first single-ended signal having a first phase delay. The phase offset circuitry may comprise a second line connected to the driver amplification circuitry and configured to provide a second single-ended signal having a second phase delay different from the first phase delay of the first single-ended signal of the first line. The balun circuitry may comprise first balun circuitry connected between the first line and the carrier amplifier circuitry, and second balun circuitry connected between the second line and the peaking amplifier circuitry.