SC-DAC RF Transmitter Power Range Switching for Low-Area Control
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Solution Overview
Problem
Digital-circuit-based RF transmitters require high-resolution digital-to-analog converters (DACs) to control output power, leading to increased circuit complexity and power consumption, making it difficult to design DACs with sufficient resolution for efficient power control in wireless communication devices.
Innovation Solution
The implementation of a switched-capacitor digital-to-analog converter (SC-DAC) with a high-power and low-power circuit configuration, allowing for selective generation of RF output signals with different power control ranges based on communication status, reducing the need for high-resolution DACs and minimizing circuit area and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high-resolution DAC is used to control output power in a digital RF transmitter, then the output power control precision is improved, but the circuit area and power consumption increase exponentially
Solution Approach 1:
The patent divides the single high-resolution DAC into multiple low-resolution DACs (first DAC and second DAC). Each DAC handles a portion of the power control range, thereby reducing the resolution requirement for each individual DAC while maintaining overall power control precision across the full dynamic range.
Solution Approach 2:
The patent dynamically switches between different DAC configurations based on the required output power level. A first DAC is used for high-power output control, while a second DAC is used for low-power output control. This dynamic selection optimizes the balance between power control precision and circuit resource utilization.
2Measurement precision
If a high-resolution DAC is used to control output power in a digital RF transmitter, then the output power control precision is improved, but the power consumption increases
Solution Approach 1:
The patent segments the power control function across multiple low-resolution DACs instead of using a single high-resolution DAC. This segmentation reduces the computational and hardware complexity of each DAC, thereby lowering the overall power consumption while maintaining the required power control precision.
Solution Approach 2:
The system dynamically selects which DAC to use based on the current power control requirements. By activating only the necessary DAC (first or second) according to the operating power level, the system minimizes power consumption while ensuring adequate power control precision is maintained.
3Adaptability or versatility
If the number of circuits is increased to allow output power control with DAC resolution, then the output power control capability is improved, but the device complexity increases
Solution Approach 1:
The patent segments the power control capability into multiple functional blocks (first DAC, second DAC, switching circuitry). Each segment handles a specific aspect of power control, which reduces the complexity within each individual block while collectively providing comprehensive power control capability across the full dynamic range.
Solution Approach 2:
The patent implements dynamic control logic that selectively activates appropriate circuits based on the required power level. This dynamic approach ensures that the full power control capability is available when needed, while minimizing the active circuit complexity during operation by deactivating unnecessary DACs and associated circuitry.
Data Source
AI summary
A radio frequency (RF) transmitter including a switched-capacitor digital-to-analog converter (SC-DAC) configured to selectively generate a first RF output signal having a first output power control range or a second RF output signal having a second output power control range from input signals received through a plurality of lines may be provided.