Single-Ended Switched Power Amplifier with Tuned Load Coupling
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Solution Overview
Problem
Switched power amplifiers, particularly those used in high-frequency applications like Bluetooth RF signals, face efficiency issues due to the need for differential signal processing, which requires two CMOS push-pull pairs and results in increased power consumption during transition periods, reducing overall efficiency.
Innovation Solution
A switched power amplifier topology that processes single-ended input signals using a single CMOS transistor pair, minimizing power dissipation and reducing the need for multiple driver circuits, thereby enhancing efficiency by eliminating overlap power consumption during transistor states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If differential signal processing is used in switched power amplifiers, then signal processing capability is improved, but power consumption increases and efficiency decreases due to requiring two CMOS push-pull pairs and transition period losses
Solution Approach 1:
The patent extracts and eliminates the differential signal processing requirement, transitioning to single-ended signal processing. This removes the need for two CMOS push-pull pairs and reduces power consumption during transition periods, while maintaining signal processing capability through the switched capacitor network
Solution Approach 2:
The patent merges the functions of two separate CMOS push-pull pairs into a single CMOS transistor pair by using single-ended signal processing. The switched capacitor network combines the functionality previously distributed across multiple transistors, reducing overall power consumption while maintaining signal processing capability
2Power
If two CMOS push-pull pairs are used for differential signal processing, then signal amplification capability is improved, but device complexity increases
Solution Approach 1:
The patent extracts and removes one of the two CMOS push-pull pairs from the circuit architecture. By using single-ended signal processing, the design eliminates the need for dual differential pairs and their associated driver circuits, reducing device complexity while maintaining signal amplification capability
Solution Approach 2:
The single CMOS transistor pair in the patent performs multiple functions that previously required two separate push-pull pairs. The switched capacitor network provides the necessary signal processing and amplification functions in a unified structure, reducing the number of driver circuits required
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
The single-ended switched power amplifier topology achieves higher efficiency by reducing power consumption and maintaining consistent power amplification across different frequency components, enabling efficient power delivery with reduced component requirements.
Implementation Method 1
a tuned load coupling block transforming the single-ended output signal to a differential signal for driving an antenna
Data Source
AI summary
A switched power amplifier contained in a circuit is implemented to receive a single-ended input signal and generate a single-ended output signal, the single-ended output signal being a power-amplified version of the single-ended input signal. The switched power amplifier provides high efficiency.