Dual-Mode Transmitter Power Control Using Cascode Amplifier Biasing
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Solution Overview
Problem
Dual mode wireless transmitters are over-designed to accommodate different power requirements for various applications, leading to unnecessary power consumption and reduced battery life in modes that do not require high power capabilities.
Innovation Solution
A circuit with a power controller that adjusts the operating characteristics of cascode transistors within an amplifier to optimize power usage based on the operational mode, using either on-chip or off-chip amplification depending on the power requirements, thereby reducing power consumption in low-power modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the transmitter is over-designed to accommodate high power requirements for gaming devices, then the transmitter can provide sufficient output power (e.g., 6 dBm) for limited range wireless connection, but the battery life is unnecessarily reduced in low power modes (e.g., cellular application at 0 dBm) where high power capabilities are not needed
Solution Approach 1:
The patent implements dynamic power adjustment by enabling the transmitter to switch between different power modes (first power mode for gaming devices at 6 dBm, second power mode for cellular applications at 0 dBm) based on the operational requirements. This dynamic adaptation allows the system to optimize power consumption for each specific application, thereby extending battery life in low-power modes while maintaining sufficient output power when needed.
2Adaptability or versatility
If the transmitter is configured with high power capabilities for one mode, then the transmitter can meet the power requirements for gaming devices, but the capabilities needed for one mode are wasted in the other mode where they are not needed
Solution Approach 1:
The patent changes the operational parameters of the transmitter by configuring it to operate at different power levels depending on the application. The transmitter can be set to a first power mode with higher output power (6 dBm) for gaming devices requiring limited range wireless connection, or a second power mode with lower output power (0 dBm) for cellular applications. This parameter adjustment ensures that power capabilities are not wasted in modes where they are not needed, reducing unnecessary energy consumption.
3Device complexity
If the transmitter uses a single amplifier design for both modes, then the device complexity is reduced, but the power consumption cannot be optimized for different operational modes
Solution Approach 1:
The patent employs a single amplifier design that dynamically adjusts its operation between two distinct power modes. The amplifier can operate in a first power mode providing higher output power for gaming devices, or switch to a second power mode providing lower output power for cellular applications. This dynamic operation within a single amplifier structure avoids the complexity of multiple amplifiers while enabling optimized power consumption for each operational mode.
Data Source
AI summary
A circuit may be provided. The circuit may be a component of a dual mode transmitter such as a transmitter from the 802.11x family. The circuit may comprise an amplifier configured to provide amplification of a signal for transmission in either a first transmission mode or a second transmission mode, using power supplied from a power supply, the amplifier including at least one cascode transistor in series with at least one amplifying transistor. The circuit may further comprise a power controller configured to define an operating characteristic of the at least one cascode transistor, and thereby designate an amount of the power from the power supply that is used by the amplifier during the amplification, based on whether the amplifier is to be operated in the first transmission mode or the second transmission mode.