Transceiver Gain Stage Supply Tracking for Lower Power Dissipation
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Solution Overview
Problem
Power amplifiers in transceivers consume constant maximum power regardless of the output signal amplitude, leading to wastage of energy when transmitting at reduced amplitudes, as the supply voltage and current density are fixed at maximum values to prevent saturation.
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 amplitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the supply voltage and current density are fixed at maximum values to prevent saturation, then the linearity and reliability of the output stage are improved, but the power consumption increases and is wasted when transmitting at reduced amplitudes
Solution Approach 1:
The patent applies dynamics by making the supply voltage variable rather than fixed. The output stage receives a dynamically adjusted supply voltage that varies in proportion to the amplitude of the output signal, allowing the system to adapt its power consumption to the actual transmission requirements while maintaining linearity when needed.
Solution Approach 2:
The patent changes the parameter of supply voltage from a constant maximum value to a variable value that scales with output amplitude. This parameter change enables the system to reduce power consumption during low-amplitude transmissions while maintaining the necessary voltage levels for linearity during high-amplitude transmissions.
2Power
If the supply voltage is increased to support maximum output voltage swing, then the maximum output amplitude capability is improved, but the power dissipation increases even when transmitting at reduced amplitudes
Solution Approach 1:
The supply voltage is made dynamic and proportional to the output signal amplitude. The output stage receives adjusted supply voltage levels that match the actual transmission requirements, enabling maximum output voltage swing capability when needed while reducing power dissipation during lower amplitude transmissions.
Solution Approach 2:
The supply voltage parameter is changed from a fixed maximum value to a variable value that scales with output amplitude. This allows the system to maintain the capability for maximum output voltage swing while reducing average power dissipation by adjusting the voltage parameter according to actual transmission demands.
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.