RF Front End Bias Calibration for Multi-Band Beamforming
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Solution Overview
Problem
Existing RF communication systems face challenges in efficiently managing bias currents for multiple radio frequency bands, particularly in millimeter wave and 5G spectra, which affect beamforming accuracy and efficiency.
Innovation Solution
A front end system with integrated amplification chains, control circuits, and multiplexors on a single die, utilizing digital-to-analog converters and shared bias generators to manage bias currents, ensuring precise control and calibration across multiple channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate bias current management circuits are used for each RF band, then bias current control precision is improved, but device complexity and area increase
Solution Approach 1:
The patent combines multiple bias current management functions into a single integrated circuit that handles multiple RF bands (e.g., 5G NR and毫米波) simultaneously. This single circuit includes bias generators, digital-to-analog converters, and control logic that can manage bias currents for different amplification chains, thereby reducing device complexity and area while maintaining control precision through software-configurable parameters.
Solution Approach 2:
The bias current management circuit is designed with universal functionality to serve multiple RF bands and amplification chains. It includes configurable parameters such as band identifiers, temperature coefficients, and gain factors that can be adjusted via software to optimize performance across different frequency bands, eliminating the need for separate dedicated circuits for each band.
2Area of stationary object
If integrated circuit design is used for all components, then device area is reduced, but manufacturing precision challenges increase
Solution Approach 1:
The patent incorporates programmable parameters and calibration mechanisms that allow post-manufacturing adjustment of bias current characteristics. Digital-to-analog converters and configurable control registers enable fine-tuning of bias currents after fabrication, compensating for process variations and ensuring precise control despite manufacturing tolerances in the integrated circuit.
3Adaptability or versatility
If multiple amplification chains are supported, then system versatility is improved, but bias current management complexity increases
Solution Approach 1:
The bias current management circuit implements dynamic control capabilities where bias parameters can be adjusted in real-time based on operating conditions. The system responds to changing temperature, frequency band, and signal conditions by dynamically reconfiguring bias currents through programmable control logic, enabling versatile support for multiple amplification chains without requiring static complex circuitry for each possible configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances beamforming accuracy and efficiency by providing precise bias current management, improving signal transmission and reception across various RF bands, including millimeter wave and 5G spectra.
Implementation Method 1
The control circuit includes a current digital-to-analog converter configured to receive a digital reference current value and generate the bias current based on the digital reference current value
Data Source
AI summary
Radio frequency (RF) front ends with integrated channel matching calibration are provided herein. In one aspect, a front end system includes: a plurality of front end amplification chains including transmit and receive chains for at least two radio frequency bands, each of the front end amplification chains configured to either transmit or receive radio frequency signals via one of a plurality of antennas, and each of the front end amplification chains includes an amplifier configured to receive a bias current and amplify the corresponding radio frequency signal based on the bias current, a control circuit configured to generate each of the bias currents, and a multiplexor configured to receive the bias currents and provide the bias currents to the corresponding amplifiers.