Parallel Power Amplifier Circuit for Filter Power Handling
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Solution Overview
Problem
The increasing demand for power amplification in communication devices, particularly for time division duplex (TDD) schemes, leads to higher power requirements for filters, which can exceed their withstand capacity, causing damage and impairing the functionality of power amplifier circuits.
Innovation Solution
A power amplifier circuit design that includes separate signal paths with filters and transformers to divide and combine signals, reducing the power handling requirements for filters by about half, allowing for increased output power while using filters like SAW or BAW filters that can implement steep filter characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the output power of the power amplifier circuit is increased, then the communication performance and coverage are improved, but the power applied to the filter exceeds its withstand capacity, causing filter damage and circuit impairment
Solution Approach 1:
The power amplifier circuit is divided into multiple parallel amplification paths (first power amplifier circuit and second power amplifier circuit), each handling a portion of the total output power. This segmentation allows the filter to process divided power levels rather than the full power, preventing filter damage while achieving high total output power through constructive combination of the parallel paths.
2Adaptability or versatility
If the number of frequency bands supported by the power amplifier circuit is increased, then the communication versatility is improved, but the power handling requirement for the filter increases, risking filter damage
Solution Approach 1:
The circuit uses parallel power amplifier paths that can be independently configured for different frequency bands. Each path processes a divided portion of the signal, allowing the system to support multiple frequency bands without requiring the filter to handle the full power across all bands simultaneously.
Solution Approach 2:
The power amplifier circuit is designed with multi-functional capability to operate across multiple frequency bands used in TDD communication schemes. The parallel architecture allows the same circuit structure to be universally applied to different frequency bands while maintaining reduced power handling requirements for the filter through signal division.
Data Source
AI summary
Provided are a power amplifier circuit and a communication device that improve a power handling capability required for a filter while increasing output power. A power amplifier circuit includes: an amplifier unit that amplifies an input signal of a time division duplex scheme and outputs a signal to a signal path and a signal to a signal path; a filter that is provided in the signal path and outputs a signal based on the signal; a filter that is provided in the signal path and outputs a signal based on the signal; and a transformer that is connected to the signal path through the filter and connected to the signal path through the filter and outputs an output signal based on the signal and the signal to a signal path.