RF Receiver Co-Design With Digital Nonlinearity Compensation
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Solution Overview
Problem
Radio frequency (RF) receiver systems face challenges in achieving high linearity and low power consumption due to nonlinear distortion, with existing solutions either consuming high power or occupying large physical space, and current anti-alias filters and ADC drivers falling short of required linearity standards.
Innovation Solution
The design of RF receiver systems incorporates digital nonlinearity compensation circuitry to balance analog and digital components, optimizing the entire system for linearity and power efficiency by iteratively adjusting nonlinear circuit parameters and constructing digital compensators to achieve the desired level of linearity with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an ADC driver with very low distortion and an anti-alias filter using passive components (LC filter) are used, then high SFDR (linearity) is achieved, but power consumption increases to 1-2 Watts and physical size becomes very large
Solution Approach 1:
The patent replaces the traditional passive LC filter with an active digital filter implemented in the digital domain. The analog anti-alias filter is substituted with a digital signal processing algorithm that performs filtering after ADC conversion, eliminating the need for large inductors and capacitors while reducing power consumption from 1-2 Watts to a fraction of that amount.
Solution Approach 2:
The patent changes the operating parameters by moving the filtering function from the analog domain to the digital domain. This parameter change allows the system to achieve the same anti-aliasing performance with significantly reduced power consumption and smaller physical footprint, as digital filters can be implemented with simple logic circuits rather than energy-consuming passive components.
2Manufacturing precision
If ADC designers focus on improving ADC linearity, then ADC SFDR increases, but the overall system SFDR remains limited by the weakest link in the signal chain
Solution Approach 1:
The patent implements digital nonlinearity compensation that characterizes the nonlinearities of individual components (RF receiver, ADC driver, anti-alias filter) and applies corrective digital filtering to compensate for their combined effect. This feedback mechanism allows the system to achieve high overall SFDR by digitally correcting the cumulative nonlinear distortion, rather than requiring each component to individually meet stringent linearity specifications.
Solution Approach 2:
The patent segments the nonlinear distortion analysis by characterizing each component's contribution to overall system nonlinearity separately. By measuring and modeling the nonlinearities of the RF receiver, ADC driver, and anti-alias filter independently, the system can apply targeted digital compensation for each component's distortion products, achieving high system SFDR through cumulative correction rather than uniform high-performance requirements across all components.
3Reliability
If separate components (RF receiver, ADC driver, anti-alias filter) are impedance matched with fifty-ohm references, then signal integrity is maintained, but integration onto a monolithic semiconductor chip becomes difficult
Solution Approach 1:
The patent merges the RF receiver, ADC driver, and anti-alias filter into a single monolithic integrated circuit. By integrating these previously separate components onto one semiconductor chip, the system eliminates the need for external fifty-ohm impedance matching networks and interconnects, while maintaining signal integrity through careful on-chip signal path design and reduced parasitic effects.
Solution Approach 2:
The patent creates a universal integrated receiver module that performs multiple functions (RF reception, amplification, filtering, and digitization) within a single chip. This multi-functional integration eliminates the need for separate impedance matching interfaces between components, as all signal processing occurs within the unified chip architecture using on-chip transmission lines and matching circuits optimized for the specific application.
Data Source
AI summary
Receiver design techniques are provided that are capable of producing relatively efficient, linear radio frequency (RF) receivers. During a design process, components of an analog receiver chain and digital nonlinearity compensation techniques are considered together to achieve reduced power consumption in the receiver.