Multi-Voltage ET Circuit for RF Linearity and Thermal Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mobile communication devices face increased power consumption and thermal dissipation due to higher output power requirements for RF signals, compromising performance and user experience, which existing envelope tracking technologies struggle to efficiently address.
Innovation Solution
A multi-voltage generation circuit and multi-amplifier envelope tracking (ET) circuit that generates ET target voltages based on analog signals, using analog multipliers and look-up tables to track time-variant power envelopes, improving efficiency and linearity, especially at higher modulation bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher output power is used to achieve higher data rates, then data transmission capability is improved, but power consumption and thermal dissipation increase
Solution Approach 1:
The patent implements dynamic voltage adjustment through envelope tracking, where the supply voltage to the power amplifier is continuously varied to match the instantaneous power requirements of the RF signal. This dynamic approach allows the amplifier to operate at optimal efficiency across different power levels rather than being constrained by a fixed high voltage, thereby reducing overall power consumption while maintaining high data rate capability
Solution Approach 2:
The system changes the voltage parameter dynamically based on the RF signal envelope. By adjusting the supply voltage to match the instantaneous power demands, the amplifier operates more efficiently at lower power levels while still being capable of delivering high output power when needed, thus resolving the contradiction between data rate and power consumption
2Productivity
If higher output power is used to achieve higher data rates, then data transmission capability is improved, but thermal dissipation increases
Solution Approach 1:
The envelope tracking system dynamically adjusts the supply voltage to match instantaneous power requirements, preventing excessive voltage application and reducing unnecessary power dissipation as heat. This dynamic control ensures thermal efficiency across varying operating conditions while maintaining high data rate capability
Solution Approach 2:
By changing the voltage parameter to match instantaneous power demands, the system reduces thermal dissipation during low-power intervals while maintaining the capability for high-power operation, thus managing thermal load effectively without compromising data transmission performance
3Use of energy by moving object
If envelope tracking is implemented to improve amplifier efficiency, then power consumption is reduced, but circuit complexity increases
Solution Approach 1:
The envelope tracking system is divided into distinct functional modules: envelope detection circuitry that extracts the voltage envelope from the RF signal, a control mechanism that processes the envelope information, and voltage adjustment circuitry that modifies the supply voltage. This segmentation allows each module to perform its function efficiently while keeping the overall system manageable despite the increased complexity
Solution Approach 2:
An intermediate control circuit processes the envelope detection signal and generates appropriate control voltages for the power amplifier. This intermediary layer simplifies the overall control architecture by separating the envelope detection function from the voltage adjustment function, making the system more manageable despite the added complexity of envelope tracking
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 enhances the efficiency and linearity of power amplifiers in mobile communication devices, reducing power consumption and thermal dissipation while maintaining high data rates, thereby improving user experience and device performance.
Implementation Method 1
a number of analog multipliers. The analog amplifiers are configured to multiply the analog voltage signal by a number of voltage scaling factors to generate a number of target voltage signals
Implementation Method 2
a plurality of analog look-up table (LUT) circuits. The analog LUT circuits are configured to convert the target voltage signals into a number of ET target voltages having a number of time-variant target voltage envelopes
Data Source
AI summary
A multi-voltage generation circuit and related envelope tracking (ET) amplifier apparatus is provided. In one aspect, a multi-voltage generation circuit is configured to generate a number of ET target voltages based on an analog voltage signal. In another aspect, a multi-amplifier ET circuit can be configured to include a number of amplifier circuits for amplifying concurrently a radio frequency (RF) signal based on a number of ET voltages. The multi-amplifier ET circuit also includes a number of driver circuits configured to generate the ET voltages base on a number of ET target voltages. In this regard, the multi-voltage generation circuit can be provided in the multi-amplifier ET circuit to generate the ET target voltages based on the analog voltage signal that corresponds to the RF signal. In examples discussed herein, the driver circuits are co-located with the amplifier circuits to help improve efficiency and maintain linearity in the amplifier circuits.