RF Low-Noise Amplifier Gain Adjustment for 5G Input Range
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Solution Overview
Problem
Conventional radio frequency low-noise amplifier circuits have poor gain adjustment effects and limited adaptation range, making them unsuitable for the adjustable gain requirements of 5G wireless communication systems.
Innovation Solution
A radio frequency low-noise amplifier circuit with a gain adjustment circuit comprising transistors, resistors, and capacitors, allowing for flexible gain adjustment by connecting additional attenuation branches to adapt to input signals of varying power sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional radio frequency low-noise amplifier with fixed gain is used, then the circuit structure is simple, but the gain cannot be adjusted to adapt to input signals of different power sizes
Solution Approach 1:
The amplifier circuit is divided into multiple parallel amplification branches, each with different gain characteristics. By selectively activating specific branches through control signals, the overall gain can be adjusted without requiring a completely different circuit design, thus achieving gain adaptability while maintaining reasonable circuit complexity.
Solution Approach 2:
The amplifier transitions from a fixed gain design to a dynamically adjustable gain structure. Control circuits dynamically select and switch between different amplification branches based on input signal power levels, enabling real-time gain adaptation to varying signal conditions.
2Adaptability or versatility
If a subsequent variable gain amplifier is used to adjust gain, then the low-noise amplifier can have fixed gain, but the overall system complexity increases and adaptation rate decreases
Solution Approach 1:
The low-noise amplifier is designed to perform multiple functions: it provides both fixed gain amplification and adjustable gain adaptation within a single circuit architecture. By integrating multiple amplification branches with different gain characteristics, the amplifier can adapt to various input signal conditions without requiring separate variable gain amplifier stages, thereby reducing overall system complexity while expanding input dynamic range.
Data Source
AI summary
A radio frequency low-noise amplifier circuit and a radio frequency chip includes a signal input end, an input matching circuit, an amplification circuit, an output matching circuit, a signal output end, and a gain adjustment circuit connected in parallel with the amplification circuit. The gain adjustment circuit includes a tenth transistor, an eleventh transistor, a twelfth transistor, a first resistor, a second resistor, a third resistor, and a fourth capacitor. A source of the tenth transistor, a source of the eleventh transistor, and a source of the twelfth transistor are connected and are grounded. The tenth transistor is connected to the first resistor, the eleventh transistor is connected to the second resistor, and the twelfth transistor is connected to the third resistor. The first resistor, the second resistor, and the third resistor are connected to the fourth capacitor. The fourth capacitor is connected to the amplification circuit.