Dual-Gain Transceiver Front End With N-Way Filtering
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Solution Overview
Problem
Current transceiver devices with low noise amplifiers using negative feedback mechanisms for variable gain introduce non-ideal parasitic effects, leading to decreased gain and noise performance, especially at high gain levels.
Innovation Solution
A transceiver device with a digital baseband circuit that selects between two circuit portions with different gains, one including an N-way filter to modulate input signals and reduce high-frequency interference, and a low noise amplifier with a fixed gain to avoid parasitic effects, allowing for adaptive signal processing based on input signal power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a negative feedback mechanism is used to achieve variable gain in the low noise amplifier, then the gain can be adjusted, but parasitic effects are introduced resulting in decreased gain and noise performance
Solution Approach 1:
The amplifier system is segmented into multiple fixed-gain amplifier stages (first amplifier with first gain, second amplifier with second gain) instead of using a single variable-gain amplifier. Each stage has a predetermined fixed gain, eliminating the need for negative feedback mechanisms and associated parasitic effects while maintaining the ability to provide different gain levels.
Solution Approach 2:
The system dynamically switches between different fixed-gain amplifier stages based on the desired gain level. A control circuit selects which amplifier stage to activate, enabling variable gain functionality through dynamic switching rather than through continuous adjustment mechanisms that introduce parasitic effects.
2Adaptability or versatility
If a negative feedback mechanism is used to achieve variable gain, then gain adjustment is possible, but gain decreases due to parasitic effects
Solution Approach 1:
The amplifier system is divided into multiple independent amplifier stages, each with a predetermined fixed gain value. By selecting and activating specific stages, the system achieves variable gain without relying on negative feedback mechanisms that cause gain reduction due to parasitic effects.
Solution Approach 2:
The system changes the gain parameter by switching between different amplifier stages with predetermined gain values rather than attempting to continuously adjust a single amplifier's gain through feedback. This discrete parameter change approach avoids the parasitic effects associated with feedback mechanisms.
Data Source
AI summary
A transceiver device includes a digital baseband circuit, a first circuit portion, and a second circuit portion. The digital baseband circuit is configured to analyze power of an input signal, in order to generate a first control signal and a second control signal. The first circuit portion has a first gain, and is configured to be selected according to the first control signal to process the input signal to generate output signals. The second circuit portion has a second gain higher than the first gain, and is configured to be selected according to the second control signal to process the input signal to generate the output signals. The first circuit portion includes an N-way filter circuit, and the N-way filter circuit is configured to modulate the input signal according to first oscillating signals to perform a filtering operation.