Adaptive Voltage Regulation for RF Phase Noise and Power
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Solution Overview
Problem
RF transceivers consume excess power due to overdesign to compensate for worst-case conditions, such as slow process corners and high temperatures, leading to inefficient power usage when these conditions are not met.
Innovation Solution
A temperature-variable voltage controller that includes a voltage regulator, process monitor circuit, and temperature-variable current source, which adjusts the output voltage based on process and temperature variations using a feedback mechanism to optimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transceiver is designed with a higher supply voltage to compensate for worst-case conditions, then the phase noise requirements are met, but the power consumption increases
Solution Approach 1:
The patent implements dynamic voltage adjustment by monitoring actual process and temperature conditions, then adjusting the supply voltage to the local oscillator accordingly. Instead of using a fixed high voltage for all conditions, the system dynamically adapts the voltage level based on real-time measurements, allowing optimal power consumption while maintaining phase noise requirements when needed.
Solution Approach 2:
The system changes the voltage parameter based on measured process and temperature conditions. By using process monitors and temperature sensors to detect actual operating conditions, the system adjusts the supply voltage parameter to match the required performance level, avoiding unnecessary high voltage application when worst-case conditions are not present.
2Reliability
If the transceiver is overdesigned to meet worst-case conditions, then the circuit reliability is improved, but the device complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where process monitors and temperature sensors continuously measure actual operating conditions and feed this information back to the voltage control system. This feedback enables the system to adjust the supply voltage based on real conditions rather than relying on conservative overdesign, achieving reliability through adaptive control rather than static oversizing.
Solution Approach 2:
The system performs self-adjustment by automatically monitoring its own operating conditions and regulating its own supply voltage. The process monitors, temperature sensors, and control logic work together to autonomously optimize the voltage supply without requiring external intervention or conservative design margins, reducing complexity while maintaining reliability.
Data Source
AI summary
A device includes a temperature-variable voltage controller, in which the temperature-variable voltage controller comprises: a voltage regulator; a process monitor circuit coupled to the voltage regulator, in which the process monitor circuit includes a ring oscillator, and a frequency counter coupled to an output of the ring oscillator; and a temperature-variable current source coupled to the voltage regulator so that, during operation, the output voltage of the voltage regulator is compensated based on a change in temperature of the temperature-variable current source.