PA Driver Cascode Bias Control for Lower Battery Drain
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in reducing battery consumption, as prior techniques that lower transmitted power do not effectively decrease battery consumption, leading to increased inefficiency and performance limitations.
Innovation Solution
The implementation of a PA driver with differential transistor pairs and a programmable voltage system, which allows for selective activation of cascode bias signals to reduce power consumption by adjusting the operating point and voltage supply, thereby reducing both transmitted power and battery drain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If transmitted power is reduced by lowering input amplitude, then transmitted power decreases, but battery consumption remains unchanged
Solution Approach 1:
The patent changes the power supply voltage parameter of the power amplifier to reduce battery consumption. By lowering the voltage supply to the PA driver circuit, the circuit consumes less power from the battery while maintaining adequate transmitted power levels, directly resolving the contradiction between transmitted power and battery consumption.
Solution Approach 2:
The patent implements dynamic voltage control of the power amplifier, allowing the voltage supply to be adjusted based on transmission requirements. This dynamic adjustment enables the system to optimize power consumption in real-time, reducing battery drain when full power is not needed while maintaining transmission capability when required.
2Use of energy by moving object
If voltage supply to PA driver is reduced, then battery consumption decreases, but output power may be compromised
Solution Approach 1:
The patent applies preliminary cascode bias signals to the differential transistor pairs before normal operation. This preliminary action prepares the circuit for low-voltage operation by establishing appropriate bias conditions, enabling the PA driver to maintain output power performance even when the voltage supply is reduced, thus resolving the contradiction between battery consumption and output power.
Solution Approach 2:
The patent changes operating parameters including voltage supply levels and bias conditions to optimize the trade-off between power consumption and output power. By carefully controlling these parameters, the system achieves reduced battery consumption while maintaining adequate output power for communication requirements.
3Reliability
If operating point is shifted away from nonlinear compression point, then linearity improves, but power efficiency may decrease
Solution Approach 1:
The patent optimizes the operating point parameters of the power amplifier to achieve a balance between linearity and power efficiency. By carefully selecting and adjusting operating parameters such as bias currents and voltage levels, the system maintains adequate signal linearity while operating at more efficient power levels, resolving the contradiction between reliability and energy loss.
Data Source
AI summary
A method to reduce transmitted output power and the battery consumption is provided. This involves first determining the required output level. The amplitude of the input signal provided to a PA driver may be based on the required output power level. This amplitude may be set by a PGA. A number of cascode bias signals are also provided to the PA driver. These cascode bias signals are based on the required output power level as well. Reducing the cascode bias signals by enabling/disabling circuits within the PA driver allows power consumption of the wireless device to be reduced.