Single-Chip DBF Radar Transmitter Architecture
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Solution Overview
Problem
Radar systems face challenges in implementing digital beam forming (DBF) transmitters due to the need for high-frequency operations, which are difficult to integrate with bipolar silicon technology, leading to separate monolithic microwave integrated circuits (MMICs) being used, resulting in increased costs and complexity.
Innovation Solution
A DBF radar transmitter is integrated into a single chip substrate, utilizing independent transmission chains with vector modulators and a control unit to enable continuous beam steering and changeable radar beam origin without separate high-speed switches, using silicon technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If radar front end is implemented as separate MMICs using GaAs technology, then high-frequency operation (24 GHz) is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the transmission chip and radar front end into a single integrated circuit implemented entirely in bipolar silicon technology. The phase shift network, previously a separate GaAs MMIC component, is now integrated onto the same silicon substrate as the transmission chip, eliminating the need for separate high-frequency MMIC components while maintaining 24 GHz operation capability
Solution Approach 2:
The patent changes the material parameter from GaAs to bipolar silicon technology, and changes the integration parameter from separate MMICs to single-chip integration. This parameter change enables the radar front end to operate at 24 GHz using standard bipolar silicon processes, eliminating the need for expensive GaAs MMICs while maintaining high-frequency performance
2Speed
If radar front end is implemented as separate MMICs, then high-frequency operation is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines the transmission chip and radar front end into a single integrated circuit, eliminating the need for separate GaAs MMIC components. This integration allows the entire radar transmitter to be manufactured using standard bipolar silicon processes, significantly reducing manufacturing cost while maintaining 24 GHz high-frequency operation capability
Solution Approach 2:
The patent replaces expensive GaAs MMIC technology with cheaper bipolar silicon technology. By using standard silicon manufacturing processes instead of expensive compound semiconductor processes, the patent achieves cost-effective high-frequency radar operation without requiring rare or expensive materials
Data Source
AI summary
One embodiment of the present invention relates to a transmitter within a single integrated chip substrate, which is capable of continuous beam steering of a transmitted radar beam as well as an option to change the physical position of the origin of the transmit radar beam. The transmitter has a signal generator that generates an RF signal. The RF signal is provided to a plurality of independent transmission chains, which contain independently operated vector modulators configured to introduce an individual phase adjustment to the high frequency input signal to generate separate RF output signals. A control unit is configured to selectively activate a subset of (e.g., two or more) the independent transmission chains. By activating the subset of independent transmission chains to generate RF output signals with separate phases, a beam steering functionality is enabled. Furthermore, the subset defines a changeable position of the transmitted radar beam.