Intermediate frequency signal amplitude measurement method and device based on pulse width counting

Abstract

The invention provides an intermediate frequency signal amplitude measurement method and device based on pulse width counting, which can be applied to any motion sensing radar sensor chip and module. According to the Doppler velocity measurement radar sensor chip, a pulse counting method with a fixed time period is used for measuring the output pulse width of a comparator, the method can be used for judging effective dynamic radar triggering, power frequency interference and other interference are prevented, and the duty ratio of a signal is measured through the method. The method can detect the amplitude of a non-continuously existing electric signal without an analog-to-digital converter, can eliminate the interference of continuous waves with constant amplitude, and is theoretically suitable for any analog quantity measurement equipment which needs to measure the signal amplitude.

Description

technical field [0001] The present application relates to the technical field of electronic equipment and electronic devices, and in particular to an integrated circuit applied in the field of radar sensors, which is suitable for any motion-sensing radar sensor chips and modules, the most typical being the application of motion-sensing detection radar chips in the field of intelligent lighting . The amplitude of non-persistent electrical signals can be detected without the need for an analog-to-digital converter (ADC), and constant-amplitude continuous wave interference can be excluded. Background technique [0002] The method of using voice-activated lights in corridors to save energy and prolong the life of bulbs has long been widely used. Due to the low reliability of voice-activated sensors, they are gradually replaced by infrared sensors. However, the infrared sensor needs to open a window and add a lens (like a fish eye) on the surface of the lamp, which destroys the...

AI Technical Summary

Problems solved by technology

The problem with this approach is that the first order RC low pass has very little rejection at 50Hz

The problem is that a 10GHz radar sensor corresponds to a Doppler frequency of 67Hz on a moving object at 1m / s, and it is impossible to use a 40Hz low-pass filter

24GHz or 77Hz radar is too expensive for smart lighting

If the radar module uses an analog-to-digital converter (ADC) to sample and then perform FIR or IIR digital filtering, a high-end MCU with ADC is required, and the cost will increase a lot

Although using ADC sampling and then doing discrete Fourier (DFT) transform can distinguish 50Hz power frequency interference and Doppler frequency at the same time, this requires higher performance of ADC and MCU, and ARM or DSP is required. Smart Lighting Applications Form a Cost Barrier

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