Adjustable Gain Power Amplifier Without RF Path Switching
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Solution Overview
Problem
Existing power amplifiers for wireless communication devices have complex circuit designs requiring excessive resources and high production costs, with difficulty in integrating switches on the radio frequency path, limiting their ability to efficiently switch between high and low power modes.
Innovation Solution
An adjustable gain power amplifier with an input matching circuit, gain adjustment circuit, biasing circuit, and output matching circuit, where the gain adjustment circuit uses a diode or triode to control biasing voltages and impedance, allowing for switching between power modes without additional power switching switches, and multiple gain adjustment branches for extended dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two independent amplification paths are used for high power mode and low power mode, then the performance can be optimized, but the overall circuit design becomes relatively complex
Solution Approach 1:
The patent merges the high power mode amplification path and low power mode amplification path into a single integrated circuit. The gain adjustment circuit includes a first amplification circuit for high power mode and a second amplification circuit for low power mode, both sharing common input and output nodes. This consolidation reduces the number of independent paths while maintaining the ability to optimize performance in both modes through selective activation via control switches.
2Adaptability or versatility
If switches are added for power mode switching, then power mode switching capability is achieved, but the circuit requires excessive resources and increases production costs
Solution Approach 1:
The control switches in the patent serve multiple functions simultaneously. They not only switch between high power and low power modes but also act as part of the amplification circuitry itself. The switches are integrated into the signal path such that they control the activation of amplification circuits while maintaining signal flow, thereby reducing the need for separate switching components and reducing overall circuit resource requirements.
3Adaptability or versatility
If independent high power mode amplification path and low power mode amplification path are designed, then power mode switching is achieved, but it is difficult to integrate switches required on a radio frequency path
Solution Approach 1:
The patent combines the switching function and amplification function into a single integrated circuit structure. The first and second amplification circuits share common input and output nodes, and the control switches are embedded within this shared structure. This merging eliminates the need for separate external switches on the radio frequency path, making the circuit easier to manufacture and integrate while maintaining power mode switching capability.
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 simplifies the circuit design, reduces production costs, and enables efficient switching between multiple power modes, achieving a larger dynamic range and convenient integration, while optimizing gain adjustment without the need for complex power switching mechanisms.
Implementation Method 1
the gain adjustment circuit uses a diode or triode to control biasing voltages and impedance
Data Source
AI summary
An adjustable gain power amplifier, a gain adjustment method and a mobile terminal are disclosed. The adjustable gain power amplifier comprises an input matching circuit, a gain adjustment circuit, a biasing circuit, a main amplification circuit, and an output matching circuit; the input matching circuit is connected between an input end and the gain adjustment circuit; the gain adjustment circuit is connected between the input matching circuit and the input end of the main amplification circuit; the output end of the main amplification circuit is connected to the output matching circuit, a positive power source end thereof is connected to a power supply source, a negative power source end thereof is connected to the biasing circuit; the biasing circuit provides different biasing voltages for the main amplification circuit; and the gain adjustment circuit and the biasing circuit are respectively connected to a gain adjustment control voltage (Vctrl).