Integrated RF Circuit with Changeover Switch for Radar Sensor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional radar sensors struggle to effectively cover the 5 GHz frequency range required for vehicle applications, such as long-range and close-range detection, due to limitations in channel count and frequency flexibility, leading to the need for separate sensors for different ranges.
Innovation Solution
An integrated radio-frequency circuit with a clock input, local oscillator, and changeover switch allows for independent operation and frequency coupling of two RF circuits, enabling them to cover the 76 GHz to 81 GHz range by switching between internal and external signals, and facilitating cascading for increased channel count and bandwidth utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple dedicated MMICs are used to increase the number of transmit and receive channels, then the channel count increases, but the overall device size and complexity increase
Solution Approach 1:
The MMIC is designed with a universal architecture that can function as both a master MMIC and a cascaded MMIC. The same hardware components (local oscillator, changeover switch, RF input) can operate in different modes depending on configuration, eliminating the need for dedicated separate MMICs for different functions and reducing overall device complexity while maintaining high channel count capability
2Adaptability or versatility
If the entire 5 GHz frequency range (76 GHz to 81 GHz) is covered using a single RF circuit, then frequency range coverage is improved, but the precision of frequency-specific detection deteriorates
Solution Approach 1:
The 5 GHz frequency range is segmented into multiple sub-ranges, with each RF circuit tuned to a specific segment (e.g., 76-79.5 GHz and 77.5-81 GHz). The changeover switch enables selective activation of specific RF circuits based on the required frequency range, allowing the system to cover the entire 5 GHz band while maintaining precise detection within each segmented frequency range through dedicated tuned circuits
3Adaptability or versatility
If identical RF circuits are tuned to different center frequencies during production, then frequency range coverage is improved, but manufacturing precision requirements increase
Solution Approach 1:
The system uses parameter changes by tuning identical RF circuits to different center frequencies during production. Each circuit is configured with specific manufacturing parameters (center frequency, bandwidth) to cover different segments of the 5 GHz range. The changeover switch and control device enable flexible parameter selection at runtime, allowing the system to adapt to different frequency requirements without requiring high-precision manual adjustment during manufacturing
Data Source
AI summary
An integrated radio-frequency circuit for a radar sensor, having a clock input that is designed to receive a clock signal produced externally to the integrated radio-frequency circuit, having a local oscillator that is designed to produce a local radio-frequency signal, having a radio-frequency input that is designed to receive an external radio-frequency signal produced externally to the integrated radio-frequency circuit, and having a changeover switch that is coupled to the local oscillator and to the radio-frequency input and is designed to change over between the local radio-frequency signal and the external radio-frequency signal for the production of a radar signal. In addition, a corresponding radar sensor and a corresponding operating method, are also described.