RF Receive Circuit With Coupled Gain Paths for Wide-Range Switching
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Solution Overview
Problem
Existing radio frequency receive circuits are limited in their application scope due to the inability to perform wide-range gain switching between high and low gains, which affects signal-to-noise ratio and linearity performance.
Innovation Solution
A radio frequency receive circuit incorporating a coupling circuit, gain adjustment circuit, and dual balanced frequency mixer that allows for selective amplification or attenuation of radio frequency signals, enabling wide-range gain switching and improved signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If only an amplification unit is used to amplify the radio frequency signal, then the circuit structure is simple, but the circuit cannot implement wide-range switching between high gain and low gain
Solution Approach 1:
The coupling circuit divides the input radio frequency signal into multiple signal paths (e.g., direct path and coupled path). Each path can be independently controlled with different gain settings, enabling wide-range gain switching by selectively combining outputs from different paths without requiring a single complex variable gain amplifier.
Solution Approach 2:
The coupling circuit serves multiple functions: it provides signal splitting, gain control, and signal combination in a single integrated structure. This multi-functionality allows the circuit to achieve wide-range gain switching while maintaining relatively simple architecture by eliminating the need for separate amplification stages for different gain levels.
2Reliability
If the radio frequency receive circuit uses fixed gain amplification, then the circuit design is straightforward, but the signal-to-noise ratio cannot be optimized for varying signal energy levels
Solution Approach 1:
The coupling circuit enables dynamic gain adjustment by allowing selective activation of different signal paths with different gain characteristics. The circuit can adapt its total gain in real-time based on input signal energy levels, optimizing signal-to-noise ratio for varying signal conditions while maintaining operational simplicity through automatic or controlled path selection.
3Adaptability or versatility
If wide-range gain switching is implemented through multiple amplification stages, then the gain adjustment range is sufficient, but the circuit complexity and noise interference increase
Solution Approach 1:
The coupling circuit extracts and utilizes the natural signal coupling effects to create multiple signal paths with inherent gain differences. By taking advantage of the coupling mechanism itself rather than adding multiple active amplification stages, the circuit achieves wide-range gain switching while minimizing the introduction of additional noise from multiple amplifier components.
Data Source
AI summary
This disclosure provides a radio frequency receive circuit, a receiver, and an electronic device, to reduce interference of noise to a first voltage signal, thereby expanding an application scope of the radio frequency receive circuit. The radio frequency receive circuit may include a coupling circuit, the gain adjustment circuit, and a dual balanced frequency mixer. The coupling circuit may be configured to: convert a first radio frequency signal into at least two second radio frequency signals, and output the at least two second radio frequency signals to the gain adjustment circuit. The gain adjustment circuit may be configured to: selectively amplify or attenuate a gain of each second radio frequency signal, and output at least two third radio frequency signals to the dual balanced frequency mixer. The dual balanced frequency mixer may be configured to mix the at least two third radio frequency signals based on a local oscillation signal.