Multi-Voltage Envelope Tracking Circuit for RF Power and Heat Control
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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 power management technologies fail to adequately address.
Innovation Solution
A multi-voltage generation circuit and related envelope tracking (ET) amplifier apparatus that generates ET target voltages based on analog signals, using analog multipliers and look-up table circuits to ensure efficient and linear amplification of RF signals, particularly at high modulation bandwidths, by tracking time-variant power envelopes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If higher output power of RF signals is employed to achieve higher data rates, then data rate is improved, but power consumption and thermal dissipation increase
Solution Approach 1:
The patent implements dynamic voltage adjustment in the power amplifier by using an envelope tracking circuit that continuously varies the supply voltage according to the instantaneous power requirements of the RF signal. This dynamic operation allows the amplifier to maintain high efficiency across varying power levels, enabling high data rates without proportionally increasing power consumption
Solution Approach 2:
The patent changes the operating parameters of the power amplifier by adjusting the supply voltage envelope to match the signal power envelope. This parameter modulation enables the amplifier to operate at optimal efficiency points dynamically, achieving high data rates while controlling power consumption through real-time parameter optimization
2Speed
If higher output power of RF signals is employed to achieve higher data rates, then data rate is improved, but thermal dissipation increases
Solution Approach 1:
The envelope tracking circuit dynamically adjusts the supply voltage to match the instantaneous power demands, preventing excessive voltage application and reducing unnecessary power dissipation as heat. This dynamic control ensures thermal management while maintaining high data rates
Solution Approach 2:
The patent converts the potential harm of high power dissipation into benefit by using the power envelope information to control the supply voltage. The same signal that indicates high power demand is used to adjust the voltage upward only when necessary, converting what would be wasteful power dissipation into efficient power delivery
3Use of energy by moving object
If time-variant voltages are constantly adjusted to maintain amplifier efficiency, then power amplifier efficiency is improved, but device complexity increases
Solution Approach 1:
The envelope tracking circuit serves multiple functions: it generates time-variant voltages for efficiency control, tracks the power envelope, and provides dynamic biasing. By consolidating these functions into a single circuit block, the patent improves efficiency without proportionally increasing overall device complexity
Solution Approach 2:
The patent introduces an envelope detector and voltage controller as intermediary components between the RF signal and the power amplifier. These intermediaries process the power envelope information and generate appropriate control voltages, enabling efficient amplifier operation through a structured control architecture that manages complexity
4Manufacturing precision
If driver circuits are co-located with amplifier circuits to improve efficiency and linearity, then amplification linearity is improved, but device complexity increases
Solution Approach 1:
The patent merges the driver circuit and amplifier circuit into a closely integrated or co-located configuration. This merging reduces signal path length and parasitic effects, improving linearity and efficiency. The integration consolidates multiple functions into a unified circuit block, managing complexity through functional consolidation
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.