Envelope Tracking Amplifier Circuit With Floating Ground Bias
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Solution Overview
Problem
Existing envelope tracking power amplifier circuits face inefficiencies due to high operational amplifier loss and power consumption when dealing with wide-range output voltages and high-frequency signals, particularly when using one-stage or two-stage operational amplifiers.
Innovation Solution
An envelope tracking device incorporating an amplifier circuit with a boost circuit and feedback network, where the operational amplifier operates in a floating ground mode, reducing power consumption and loss by using a reference voltage greater than the first voltage supply and less than the second, and employing a boost circuit to maintain current signal magnitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a one-stage operational amplifier circuit is used, then the circuit is simple and power consumption is small, but the magnitude of the input envelope signal must be relatively large which is difficult to realize
Solution Approach 1:
The patent divides the amplification process into two stages: a first operational amplifier for initial amplification and a second operational amplifier for further amplification. This segmentation allows each stage to operate with moderate gain requirements, enabling the use of smaller input signals while maintaining overall high gain without requiring excessively large input envelope signal magnitudes
2Ease of operation
If a two-stage operational amplifier circuit is used, then the magnitude of the input envelope signal can be relatively small, but the number of devices is increased and power consumption is relatively large
Solution Approach 1:
The patent changes the operating parameters of the operational amplifiers by implementing a floating ground mode where the reference voltage is dynamically adjusted based on the output voltage of the power amplifier. This parameter change allows the operational amplifiers to operate more efficiently with reduced power consumption while maintaining the ability to handle small input signal magnitudes
3Adaptability or versatility
If the envelope tracking power amplifier requires a wide range of power supply envelope voltage, then the range of output voltage is wide, but the loss of operational amplifier in linear amplification process is relatively large and efficiency is relatively low
Solution Approach 1:
The patent implements dynamic operation by making the reference voltage of the operational amplifier float and adjust according to the output voltage of the power amplifier. This dynamic adjustment allows the operational amplifier to maintain optimal operating conditions across a wide output voltage range (10V-30V), significantly reducing linear amplification loss and improving overall efficiency compared to fixed ground reference configurations
Data Source
AI summary
An envelope tracking method and device are provided. The envelope tracking method includes: acquiring, by a boost circuit, a target envelope tracking input current signal, and transmitting, by the boost circuit, the target envelope tracking input current signal to an amplifier circuit, where the amplifier circuit includes an operational amplifier and a feedback network, and the operational amplifier operates in a mode of floating ground; and performing, by the amplifier circuit, closed-loop conversion and amplification on the target envelope tracking input current signal and outputting, by the amplifier circuit, an envelope tracking output voltage.