Inductively Coupled Power Amplifier Control for Lower RF Power Use
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Solution Overview
Problem
Inefficient power consumption in RF transmitter circuitry due to inefficient power amplifier operation, where all power amplifiers are often turned on unnecessarily, leading to increased energy usage even when only a few are required for signal strength.
Innovation Solution
A power control circuit using a coupling circuit with a primary winding and multiple secondary windings, where power amplifiers are enabled or disabled based on bias voltages applied to the secondary windings, reducing parasitic capacitance and power consumption through DC coupling and inductive signal transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all power amplifiers are turned on to ensure sufficient signal strength, then the signal coverage is improved, but the power consumption increases significantly
Solution Approach 1:
The patent implements dynamic control of power amplifier circuits by selectively enabling or disabling specific PA circuits based on real-time signal strength requirements. The system transitions from a static all-or-nothing approach to a dynamic selective activation approach, where the number and configuration of active PAs are adjusted according to the actual transmission needs, thereby optimizing the balance between signal strength and power consumption.
Solution Approach 2:
The patent applies local quality by differentiating the operational state of individual power amplifier circuits rather than treating them uniformly. Specific PA circuits are enabled or disabled based on their contribution to the overall signal strength requirement, allowing the system to activate only the necessary local components (specific PAs) rather than all components simultaneously, thus reducing unnecessary power consumption while maintaining adequate signal coverage.
2Power
If multiple power amplifiers are used in parallel to increase output power, then the power output is improved, but the device complexity and passive area increase
Solution Approach 1:
The patent segments the power amplifier system into multiple independent controllable PA circuits, each with its own control mechanism. This segmentation allows the system to achieve high output power when needed by activating multiple PAs, while reducing complexity by enabling selective deactivation of individual PAs when full power is not required, thus managing the trade-off between output power capability and operational complexity.
Solution Approach 2:
The coupling circuit is designed to serve multiple functions: it enables parallel operation of multiple PAs for high power output, allows selective activation of individual PAs for reduced power modes, and provides a unified interface for controlling multiple amplifier circuits. This multi-functionality reduces the need for separate control circuits for each PA configuration, thereby managing device complexity while maintaining power flexibility.
3Reliability
If traditional AC coupling is used to connect power amplifiers, then the signal isolation is improved, but the parasitic capacitance and power consumption increase
Solution Approach 1:
The patent replaces the traditional AC coupling mechanism (which relies on capacitive coupling) with a DC coupling approach combined with selective PA activation. This substitution eliminates the parasitic capacitance inherent in AC coupling circuits, thereby reducing the energy losses associated with charging and discharging coupling capacitors while maintaining adequate signal isolation through the selective enabling/disabling of PA circuits rather than through capacitive isolation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces power consumption by selectively enabling only the necessary power amplifiers, increasing the gain and reducing signal loss, while minimizing the passive area and complexity of the coupling circuit.
Implementation Method 1
The coupling circuit includes a primary winding, a first secondary winding and a second secondary winding. The first secondary winding and the second secondary winding are inductively associated with the primary winding. The coupling circuit is configured to provide a signal at output terminals of the first secondary winding and the second secondary winding in response to an input signal received at the primary winding.
Data Source
AI summary
Circuits for reducing power consumption in power amplifier circuits are disclosed. In certain embodiments, a circuit for power control in the transmitter includes a coupling circuit, a first power amplifier circuit and a second power amplifier circuit. The coupling circuit includes a primary winding inductively associated with a first secondary winding and a second secondary winding. The coupling circuit provides a signal at output terminals of the first secondary winding and the second secondary winding in response to a signal at the primary winding. A first power amplifier circuit is coupled with output terminals of the first secondary winding, and a second power amplifier is coupled with output terminals of the second secondary winding. The first power amplifier circuit and second power amplifier circuit are configured to be enabled or disabled based on a bias voltage.