Transmission Circuit Linearity and Efficiency Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional transmission circuits for mobile telephony and wireless LAN struggle to maintain signal linearity and efficiency across varying output power levels, often requiring complex error correction and resulting in increased power consumption and circuit size.
Innovation Solution
A transmission circuit comprising a signal generating section, computation section, regulator, and angle/modulation sections that dynamically adjust amplitude and phase signals based on input data and power thresholds, combining them to produce a high-linearity signal without branching, thus reducing power loss and consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional transmission circuits (quadrature modulation or polar modulation) are used, then the circuit structure is simple and widely known, but the linearity of the transmission signal deteriorates and power consumption increases
Solution Approach 1:
The transmission circuit is divided into multiple functional sections: a first modulation section that generates a first modulated signal with adjusted phase, and a second modulation section that generates a second modulated signal with adjusted amplitude. This segmentation allows independent optimization of phase and amplitude control to achieve high linearity while reducing power consumption
Solution Approach 2:
The circuit dynamically adjusts the phase and amplitude of modulated signals based on the magnitude of the input signal. When the input signal magnitude is large, the circuit adjusts phase; when small, it adjusts amplitude. This dynamic adaptation maintains signal linearity across varying power levels while optimizing power consumption
2Power
If conventional transmission circuits operate at high output power, then the transmission signal has sufficient power, but the circuit size and complexity increase
Solution Approach 1:
The transmission circuit is designed to operate efficiently across a wide range of output powers (from small to large power) using the same basic circuit structure. The dual modulation sections work together to provide universal performance across different power levels without requiring separate circuits for different power ranges, thereby reducing overall circuit size and complexity
3Measurement precision
If the transmission circuit uses error correction mechanisms, then the signal accuracy improves, but the circuit complexity and power consumption increase
Solution Approach 1:
The transmission circuit incorporates feedback mechanisms where the output signals from the first and second modulation sections are combined and fed back to adjust the input signals to the modulation sections. This feedback loop continuously corrects for errors and maintains signal accuracy without requiring complex external error correction circuits, thereby improving precision while controlling circuit complexity
Data Source
AI summary
A small-size transmission circuit is provided which outputs a transmission signal having high linearity independently of a magnitude of an output power, and operates with high efficiency. A signal generating section generates quadrature data based on input data. A computation section compares an amplitude component of the quadrature data with a predetermined amplitude threshold value, and outputs an amplitude signal, a first phase signal, and a second phase signal. A regulator outputs a voltage controlled depending on the amplitude signal. An angle modulation section and an angle modulation section angle-modulate the phase signal to output first and second angle-modulated signals. An amplitude modulation section and an amplitude modulation section amplitude-modulate the first and second angle-modulated signals using a voltage controlled depending on the amplitude signal to output the angle-modulated and amplitude-modulated signals as a first modulated signal and a second modulated signal. A combining section combines the first and second modulated signals to output a transmission signal.