Transceiver Power Amplifier Supply Tracking for Reduced Power Loss
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Solution Overview
Problem
Power amplifiers in transceivers consume constant maximum power regardless of output signal amplitude, leading to wastage when transmitting at reduced amplitudes, as the supply voltage and current density are set for peak output levels.
Innovation Solution
Implementing a voltage amplitude tracking and current density tracking system that adjusts the supply voltage and current density in proportion to the output signal amplitude, using a buck or boost regulator to vary the supply voltage and a correlator to control current density, thereby reducing power dissipation during varying output conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the supply voltage and current density are set for peak output levels, then the maximum output amplitude is supported, but power is wasted when transmitting at reduced amplitudes
Solution Approach 1:
The patent implements dynamic adjustment of supply voltage and current density based on the actual output signal amplitude. The output stage transitions from static operating parameters set for peak power to dynamic parameters that track the instantaneous signal level, allowing the system to adapt its power consumption to the actual transmission requirements and eliminate unnecessary power waste during reduced amplitude transmission.
Solution Approach 2:
The patent changes the operating parameters (supply voltage and current density) of the output stage from fixed values to variable values that are modulated according to the output signal amplitude. This parameter modulation enables the system to maintain optimal linearity at each amplitude level while consuming only the necessary power, rather than operating continuously at maximum power settings.
2Manufacturing precision
If the linearity is set to deliver the required linearity at the maximum output, then the maximum output linearity is achieved, but power consumption remains constant at maximum value
Solution Approach 1:
The patent applies dynamic control to the linearity parameter by adjusting the operating point of the output stage according to the signal amplitude. Instead of maintaining fixed bias conditions optimized for maximum power, the system dynamically repositions the operating point to achieve appropriate linearity at each amplitude level, reducing the power required to maintain linearity when operating below maximum output.
Solution Approach 2:
The patent modifies the linearity characteristics of the output stage by changing its operating parameters (voltage and current) in real-time. This allows the system to achieve the necessary linearity performance at each instantaneous amplitude level without continuously operating at the high power settings required for maximum output linearity, thereby reducing overall power consumption while maintaining acceptable linearity across the dynamic range.
Data Source
AI summary
Various embodiments are directed to apparatuses and methods to generate a first signal representing modulation data and a second signal representing an amplitude of the modulation data, the first signal and the second signal to depend on an output signal and vary a power supply voltage to a gain stage in proportion to the amplitude of the modulation data.