Configurable Baseband Filter and Upconverter for Low-Power Linearity
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Solution Overview
Problem
Existing wireless device transmitters are inefficient at lower output powers due to Class-A operation, leading to reduced battery life, as they consume excessive power to meet stringent linearity requirements across the entire output power range.
Innovation Solution
A configurable baseband filter and upconverter that can switch between Class-A and higher efficiency modes such as Class-A/B, Class-B, or Class-C operation based on output power requirements, using a controller to adjust the operating mode and circuit configurations to conserve power during lower power intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Class-A operation is used across the entire output power range to meet linearity requirements, then transmission quality is improved, but power consumption increases significantly at lower output powers
Solution Approach 1:
The baseband filter and upconverter dynamically switch between Class-A and higher efficiency operating modes based on the output power range. A controller monitors the output power and adjusts the operating mode accordingly, transitioning from Class-A at high power to Class-A/B, Class-B, or Class-C at lower power levels, thereby optimizing the balance between linearity and power efficiency
Solution Approach 2:
The operating parameters of the baseband filter and upconverter are changed by switching between different classification modes. The controller modifies bias conditions, current levels, and circuit configurations to transition between Class-A, Class-A/B, Class-B, and Class-C operation, allowing the system to adapt its electrical characteristics to match the required output power level
2Reliability
If Class-A operation is maintained at lower output powers to ensure linearity, then transmission quality is preserved, but battery life is reduced due to excessive power consumption
Solution Approach 1:
The system dynamically adapts its operating mode based on real-time power level requirements. During talk-time and low power intervals, the controller switches the baseband filter and upconverter to higher efficiency modes (Class-A/B, Class-B, or Class-C), significantly reducing power consumption and extending battery life while maintaining adequate transmission quality for the current power level
Solution Approach 2:
The controller changes operating parameters such as bias current, supply voltage, and circuit topology to transition between classification modes. At lower output powers, the system modifies these parameters to enable higher efficiency operation, reducing the power draw during extended low-power usage periods and thereby extending overall battery duration
Data Source
AI summary
A baseband filter and upconverter with configurable efficiency for use in wireless transmitters is disclosed. In an exemplary embodiment, an apparatus is provided that includes a baseband filter having configurable efficiency, and an upconverter having configurable efficiency and coupled to the baseband filter. The baseband filter and upconverter are configured to operate at a first efficiency level in a first output power range and to operate at a second efficiency level in a second output power range.