RF Linearizer Capacitor Pair for Intermodulation Distortion Reduction
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Solution Overview
Problem
Existing radio frequency (RF) circuits face challenges with nonlinearity, leading to intermodulation distortion (IMD) in the transmission and handling of RF signals, which affects the performance of semiconductor and electronics devices.
Innovation Solution
The implementation of a radio frequency circuit with a linearizer circuit comprising a first capacitor and a second capacitor arranged in parallel, where the first capacitor has a positive third order derivative of charge with respect to voltage, and the second capacitor has a negative third order derivative of charge with respect to voltage, to reduce total third order derivative and improve linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional RF circuits are used, then the circuit structure is simple, but intermodulation distortion occurs due to nonlinearity
Solution Approach 1:
The patent introduces a linearizer circuit that converts the harmful nonlinear effects into beneficial linearizing effects. The linearizer uses capacitors with opposite third-order derivative characteristics to cancel out the nonlinear distortion generated by RF switches and amplifiers, thereby converting the harmful intermodulation distortion into improved signal linearity.
Solution Approach 2:
The linearizer circuit acts as an intermediary component between the RF signal source and the output. It mediates the nonlinear distortion by introducing capacitors with specific third-order derivative characteristics that counterbalance the nonlinear effects, thereby improving overall circuit linearity without requiring fundamental changes to the RF amplification architecture.
2Object-generated harmful factors
If linearizer circuit is added to reduce intermodulation distortion, then linearity is improved, but device complexity increases
Solution Approach 1:
The patent achieves linearity improvement by carefully selecting and adjusting the third-order derivative parameters of the capacitors in the linearizer circuit. By changing the capacitance values and their voltage-dependent characteristics, the circuit can optimize the cancellation of nonlinear distortion while maintaining a relatively simple overall structure.
Solution Approach 2:
The linearizer circuit employs a composite configuration of capacitors with opposite third-order derivative characteristics. This composite approach combines components with different electrical characteristics to achieve the desired linearizing effect, where the combined behavior of the capacitor pair produces superior linearity performance compared to individual components.
Data Source
AI summary
The present disclosure relates to a radio frequency circuit comprising a linearizer circuit. The linearizer circuit may comprise a first capacitor and a second capacitor arranged in parallel. The first capacitor may have a positive third order derivative of charge with respect to voltage. The second capacitor may have a negative third order derivative of charge with respect to voltage. Related radio frequency modules and wireless communication devices are also disclosed.