Concurrent Matching Transceiver With Step-Up Transformer for NF Control
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Solution Overview
Problem
Concurrent matching in transceivers with internal TR switches and series Doherty PAs introduces losses and degrades receive sensitivity and efficiency, particularly due to NF peaks near in-band frequencies, posing challenges in designing optimal matches for both transmit and receive modes.
Innovation Solution
The transceiver design incorporates a series Doherty amplifier with a third transformer coupled to the secondary winding of the main transformer, forming a step-up transformer to improve receive noise figure and front-end gain, while reducing losses in passive devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If concurrent matching is implemented in transceivers with internal TR switches and series Doherty PAs, then transmit efficiency and output power are improved, but receive sensitivity and noise figure are degraded due to losses in passive devices
Solution Approach 1:
The patent divides the transceiver into separate transmit and receive signal paths with independent matching networks. The transmit path uses a series Doherty PA with its own impedance matching, while the receive path uses a parallel LNA with separate matching, allowing each path to be optimized independently without compromising the other
Solution Approach 2:
The patent inverts the conventional approach by placing the TR switch at the PA output rather than the antenna input. This allows the receive path to bypass the PA and its matching network entirely, eliminating the source of noise figure degradation while maintaining transmit functionality
2Power
If concurrent matching is implemented in transceivers with internal TR switches and series Doherty PAs, then transmit efficiency and output power are improved, but noise figure peaks near in-band frequencies are introduced
Solution Approach 1:
The patent extracts the receive signal path from the transmit path by routing received signals directly to the LNA through the antenna switch, bypassing the Doherty PA and its matching network. This removes the source of noise figure peaks near in-band frequencies while preserving transmit efficiency
Solution Approach 2:
The patent introduces an intermediary receive path that acts as a mediator between the antenna and LNA, allowing received signals to be processed separately from transmitted signals. This intermediary path eliminates the harmful noise figure peaks while maintaining the benefits of concurrent matching in the transmit path
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances transmit efficiency and output power while improving receive sensitivity and noise figure, optimizing performance in both transmit and receive modes.
Implementation Method 1
a secondary winding inductively coupled to the primary winding of the first transformer
Implementation Method 2
a secondary winding inductively coupled to the primary winding and coupled between a first terminal of the secondary winding of the first transformer and a reference potential node
Data Source
AI summary
Certain aspects of the present disclosure are directed towards techniques and apparatus for implementing concurrent matching for a transmitter and a receiver. An example transceiver may include a first amplifier, a second amplifier, a third amplifier, a first transformer, a second transformer, a first switch, and a third transformer. The first switch is coupled between a terminal of a secondary winding of the first transformer and a reference potential node.