Switchable Feedback Power Amplifier for Multi-Gain RF Transmission
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Solution Overview
Problem
Current radio frequency power amplifiers in communication terminals face challenges in efficiently adjusting gain modes to match varying path attenuation conditions, leading to high power consumption in low-gain modes and inadequate battery power savings.
Innovation Solution
A multi-gain mode power amplifier is designed with a circuit structure that includes a bias circuit, feedback circuit, and input/output matching networks, allowing for adjustment of bias or control voltage to switch between high-gain and low-gain modes, reducing current consumption in low-gain mode through controlled transistor and diode conduction states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the power amplifier operates in low-gain mode to improve efficiency at low output power, then power consumption is reduced, but the circuit complexity increases due to additional control mechanisms
Solution Approach 1:
The power amplifier dynamically switches between high-gain and low-gain modes based on operating conditions. The gain mode is controlled by adjusting the bias voltage or control voltage, which changes the conduction state of the feedback circuit. This dynamic adaptation allows the amplifier to optimize power consumption by operating in low-gain mode when efficiency is critical, while maintaining the capability to switch to high-gain mode when maximum output power is required.
Solution Approach 2:
The invention changes the operating parameters of the power amplifier by adjusting bias voltages and control voltages to switch between different gain modes. Specifically, the control voltage applied to the feedback circuit determines whether it is in a turned-on or turned-off state, thereby changing the overall gain of the amplifier. This parameter adjustment enables the system to achieve different operating points without requiring completely different circuit topologies.
2Reliability
If the power amplifier transmits high power to overcome high path attenuation, then signal stability is improved, but current consumption increases
Solution Approach 1:
The power amplifier system dynamically adapts its transmission power based on path attenuation conditions. When path attenuation is high, the system switches to high-gain mode to transmit high power and ensure signal stability. When path attenuation is low, it switches to low-gain mode to reduce current consumption. This dynamic control is achieved through adjusting the bias or control voltage to change the amplifier's operating state.
Solution Approach 2:
The feedback circuit plays a crucial role in controlling the amplifier's gain mode. By adjusting the control voltage applied to the feedback circuit, the system can regulate the amount of feedback, thereby controlling the overall gain. This feedback mechanism enables precise control over the transmission power level, allowing the system to maintain signal stability when needed while minimizing current consumption during normal operation.
Data Source
AI summary
A multi-gain mode power amplifier, a chip, and a communication terminal. The multi-gain mode power amplifier comprises at least one amplifier circuit. The amplifier circuit comprises a bias circuit, a feedback circuit, a transistor (101), and an input matching network/output matching network. A bias voltage or a control voltage (120) is adjusted to make the feedback circuit to be either turned on or turned off, thus allowing the amplifier circuit to work in a high-gain mode or a low-gain mode. The multi-gain mode power amplifier has different gain modes, fully satisfies the actual demand of the communication terminal to work in the high-gain mode when transmitting a high power and to work in the low-gain mode when transmitting a low power.