Millimeter wave radar chip capable of being cascaded

Abstract

The invention discloses a millimeter wave radar chip capable of being cascaded. The millimeter wave radar chip includes a substrate, millimeter wave transmitting and receiving ports RF1 to RF4, four phase shifter units A, B, C and D, eight millimeter wave switch units S0-S7, power divider cascade adaptive interface units E and F, a millimeter wave voltage-controlled oscillator and frequency multiplication unit V, a millimeter wave mixer unit M, a mixed analog intermediate frequency signal interface unit I, a serial peripheral interface unit SPI, a millimeter wave voltage-controlled oscillatorunit Vt for receiving an external control signal to regulate and control the interior, and a radar chip power supply interface unit PWR. According to the invention, the cascading of the multiple radarchips is simple, and the cascading can be completed only through the adaptation of the cascading adapter interface of the power divider; the circuit is simple in structure, only transmitting waveforms generated by a phase-locked loop need to be transmitted to a main mode chip in a cascade system, intermediate frequency output by the main mode chip is transmitted to a post-stage ADC to be sampled,intermediate frequency output by a slave mode chip does not need to be transmitted to the post-stage ADC to be processed, and therefore post-stage processing is simple.

Description

technical field [0001] The invention belongs to the technical field of radar chips, and relates to a millimeter-wave radar chip, in particular to a millimeter-wave radar chip capable of cascading. Background technique [0002] Millimeter wave radar is a radar that works in the millimeter wave band. Generally, millimeter waves refer to electromagnetic waves with a frequency range of 30-300 GHz (corresponding to a wavelength of 1-10 mm). The wavelength of the millimeter wave is between the centimeter wave and the light wave, so the millimeter wave has the advantages of microwave guidance and photoelectric guidance. [0003] The millimeter-wave radar used in automobiles refers to radars with millimeter-level wavelengths (currently mainly using 24GHz, 77GHz or 79GHz frequency bands), which can quickly and accurately obtain target information around cars and drones, such as relative distances, relative speeds, and angles , Whether there is an object, the direction of movement, ...

AI Technical Summary

Problems solved by technology

[0008] However, in the existing solutions, each radar front-end chip uses one or more independent IF interfaces to output IF signals for subsequent ADC processing, so that the post-stage processing unit must use multiple independent ADCs to process the corresponding IF signals. And for each intermediate frequency, FFT operation processing and storage must be performed first. This method makes the circuit of the multi-chip cascaded system complex and puts forward high requirements for signal processing and storage of the MCU, which brings great challenges to the post-processing. pressure

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