Wideband RF Receiver Amplifier Layout for Nonlinearity Cancellation
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Solution Overview
Problem
Wireless communication devices face challenges in effectively supporting carrier aggregation due to degradation in noise and gain features, which affects their ability to transmit and receive data efficiently.
Innovation Solution
A wireless communication device is designed with a receiver that includes a combination of first and second amplification units, each using amplifiers with different properties to cancel out non-linearity factors, thereby improving the gain feature and signal receiving sensitivity by offsetting non-linearity factors during the amplification process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a wireless communication device uses a single amplification unit to receive RF signals in carrier aggregation mode, then the device structure is simple, but the gain feature and signal receiving sensitivity are degraded due to non-linearity factors
Solution Approach 1:
The amplification function is segmented into multiple amplification units (first amplification unit and second amplification unit), each with different non-linearity characteristics. This segmentation allows the system to process RF signals through multiple paths with complementary non-linearity factors, resolving the contradiction between structural simplicity and gain feature reliability.
Solution Approach 2:
Each amplification unit is designed with distinct local qualities - specifically, different non-linearity factors. The first amplification unit has a first non-linearity factor while the second amplification unit has a second non-linearity factor, creating local quality differences that enable non-linearity cancellation when signals are combined, thereby improving overall gain feature without excessive complexity.
2Reliability
If amplifiers with different properties are combined to cancel non-linearity factors, then gain feature and signal sensitivity are improved, but device complexity increases
Solution Approach 1:
Multiple amplification units with different non-linearity factors are merged into a unified amplifier structure. The outputs of the first and second amplification units are combined to produce an RF amplified signal where non-linearity factors cancel each other, achieving improved signal receiving sensitivity while maintaining a relatively integrated device structure rather than completely separate systems.
Solution Approach 2:
The amplifier system uses a composite approach by combining amplification units with different non-linearity characteristics, analogous to using composite materials. Each amplification unit acts as a component with specific properties, and their combination creates a system with superior overall performance that neither unit could achieve alone, balancing complexity improvement with structural integration.
Data Source
AI summary
A wireless communication device includes an amplifier block amplifying a radio frequency (RF) input signal. The amplifier block includes: a first amplification unit and a second amplification unit. The first amplification unit amplifies the RF input signal to generate a first RF amplified signal including a first non-linearity factor and a second RF amplified signal including a second non-linearity factor, and combines the first and second RF signals to generate a third RF amplified signal. The second amplification unit receives and amplifies the third RF amplified signal to output an RF output signal corresponding to the at least one carrier.