Study Of A Program-controlled Signal Generator Which Used In The Calibration System Of Piezoelectric Accelerometer

The theory and its designs of hardware and software of a program-controlled sine signal generator which used in the vibration calibration system of piezoelectricity acceleration sensor is being discussed mostly in this article. After that, according to the development order of the program-controlled sine signal generator, we divide our work into the following parts: firstly, its theory discussing and demonstrating part, here we bring forward the overall design of the DDS program-controlled sine signal generator; secondly, we bring forward its actual hardware circuit and software design which we have done in the realization of the program-controlled sine signal generator; at last, it's analysis of the error and experiment part, namely, we validate the design here.This DDS program-controlled sine signal generator system is based upon computer's serial interface. The basic fundamental of this signal generator is: it takes the 8051 singlechip as core of control, and adopts the direct digital synthesis theory in the design. The realization of DDS is the key part of this designs, it is mostly embodied in the design of hardware circuit. Here, we used a large number of integrate circuit which embodied in the realization of frequency synthesize, wave generate, lowpass design and the control of frequency and amplitude of wave. In the last part, we analyse the error of this signal generator, in addition, we do many experiments to validate the function and performance of this signal generator, and come to a conclusion that the design of this signal generator is completely satisfied with the need of experiments.This article introduces the DDS program-controlled sine signal generator into the calibration system. Comparing with the traditional signal generator which needs to be operated by human, this generator greatly improves efficiency, reduces artificial errors, also assures the precision of calibration, thereby provides an efficient level for the automation of the calibration of piezoelectric accelerometers.