Square wave-sine wave signal converting method and converting circuit

Abstract

The invention discloses a square wave-sine wave signal transformation method comprising the steps as follows: a square wave signal generates N square wave control signals with the same period; the N square wave control signals arrayed in sequence respectively generate N square wave secondary signals; the amplitude sum of the N square wave secondary signals is a; the amplitude of the square wave signal n is a right type; the N square wave secondary signals are processed through superposition to obtain a false sine wave signal; and the false sine wave signal is processed through filtration to obtain a sine wave signal. A square wave-sine wave signal transformation circuit is also disclosed, and the superposition of the N square wave secondary signals in the method is realized by controlling the superposition of current so as to obtain the sine wave signal. The square wave-sine wave signal transformation method and the square wave-sine wave signal transformation circuit avoid adopting a higher order high-frequency filter directly, greatly save the area and the power consumption of a chip, and reduce the design complexity.

Description

technical field [0001] The invention relates to an electric signal conversion method, in particular to a square wave-sine wave signal conversion method. The invention also relates to an electric signal conversion circuit, especially a square wave-sine wave signal conversion circuit. Background technique [0002] In some digital-analog mixed signal systems, it is often necessary to extract the fundamental frequency of a square wave or a signal similar to a square wave, that is to say, it is necessary to extract a sine wave with a frequency of 1 / T from a digital signal with a period of T. , and remove high-order harmonics, especially in the modulation process of some communication systems, there are relatively strict regulations on the transmission power spectrum to prevent interference with the reception or transmission of the communication system and other communication systems, while high The existence of sub-harmonics often makes the modulation spectrum fail to meet the e...

AI Technical Summary

Problems solved by technology

In short, the direct filtering method of the filter often needs to achieve the required filtering effect at the cost of increasing power consumption and order, an...

Images