Product-to-pulse conversion method and circuit

Abstract

A conversion method and circuit from product to pulse applies analog signal product to be converted to certain frequency output pulse in stead of analog circuit existed in present technique. It is made by converting the product of two analog signal into a certain frequency output pulse with the pulse frequency relating to the big or small or signal product, converting analog signal into digital signal 1 and modulated signal 2 by analog-digital converter and modulator, multi plying digital signal, with modulated signal 2 by multiplier to create digital signal 2 which being filtered for product, converting the product into a certain frequency pulse signal by product-pulse converter. The sampling frequency of two route analog signal can be different as well as the working frequency of product-pulse converter and the output frequency of product also can be different.

Description

technical field [0001] The invention relates to a method and circuit for converting analog signal product into pulse output, and the frequency of the pulse is directly proportional to the magnitude of the product. Background technique [0002] The conversion of the product of the analog signal to the pulse output includes two parts: the generation of the product of the analog signal and the conversion of the product to the pulse output. The usual implementation method is as figure 2 As shown, the two analog signals are multiplied by an analog multiplier (6) to generate a product (pd), which is output as a pulse signal through a voltage-frequency converter (7), and the frequency of the pulse signal Proportional to the value of the product (pd). A typical voltage-to-frequency converter circuit such as image 3 As shown, it is composed of an analog integrator (8), a comparator (9), a logic control circuit (10) and an analog switch (11). This implementation method is mainly ...

AI Technical Summary

Problems solved by technology

This implementation method is mainly composed of analog circuits. Due to the limitations of analog circuits in terms of accuracy, linearity, offset, speed, etc., this implementation method often cannot meet the system requirements in applications that require higher accuracy and output frequency.

In order to solve this problem, the analog signal is usually converted into a digital signal, the product is multiplied by the digital signal, and then the product is converted into a pulse output by digital processing. In order to ensure accuracy, the analog signal needs to be converted into a multi-digit number signal, making the scale of the analog-to-digital converter circuit and the digital multiplier circuit larger, and the cost of the circuit increases

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