Papers by Keyword: DAC

Abstract: In this paper, a 16 Bits 500 kHz Sigma-Delta DAC for Silicon Micro Gyroscope is proposedin order to enhance the precision of the digital to analog converter level.The interpolation filterhas achieved 64 times interpolation function,using three cascaded manner, it employs three level cascaded of FIR filterstructure. It achieves a 64 times oversampling feature. The signalbandwidth of the designs interpolation filter is 100 kHz, SNR reach 106dB. Fifth-order single-loop structure CIFB achieve noise shaping modulator function to verify the stability of the system, after the completion of CSD coefficient coding, signal to noise ratio reached 119.7dB, effective bits reached 19.59. The switched capacitor technology actualize analog reconstruction filter module, and using a typically switched capacitor DAC achieved high jump "0, 1" digital signal is converted into an analog signal, the digital-analog conversion achieved.

Abstract: Fine arts, in recent years, with the rapid development of information technology, its diverse artistic expression trends to be more obvious, at the same time, the artistic expression based on multimedia has been paid more attention by the fields. This paper firstly analyzes the general characteristics of art image fusion process in multimedia environment. On this basis, the digital-to-analog conversion (DAC) method of multimedia artistic expression is proposed, which takes the Gauss Pyramid as basis. In order to verify the scientificity of this method, this paper adopts the empirical method to carry on the empirical analysis. The results show that multimedia artistic expression behavior of fine arts based on this method is significant, and has strong practicability and operability.

Abstract: Now some special circuits need higher precision in relatively fixed range. While the precision of a common digital-to-analog converter (DAC) is equidistant, which means the higher the precision is, the greater the number of bits. The increase of number of bits will slow down the speed of converter. This architecture we present here aims at finding a way of solving the problem. It uses M bits of the N-bit DAC to adjust precision by changing the current of the voltage division circuit, which alters the range of the DAC to a certain extent.

Abstract: Based on the grey theory, a novel model is built to predict the input signal of fast control power supply used in Experimental Advanced Superconducting Tokamak (EAST). The model can be used as online metabolic grey filtering and one-step prediction of different input signals. Results of simulation and experiment show that the predicting algorithm based on the grey system model can predict the input signal primarily.

Abstract: In order to increase the flexibility of control for serial DAC, a new control method for DAC based on FPGA is proposed in this paper. A state transition diagram can be drawn according to the timing diagram of DAC, Which can be realized in FPGA using Very High-speed Integrated Circuit Hardware Description Language. The simulate results show that logic in FPGA is consistent with the requirements. The module based on FPGA can be modified just by modifying software, not the hardware.

Abstract: In this paper, a kind of novel DAC architecture is proposed. Compared to the traditional DAC architecture, the proposed is a multistage one. In order to improve precision, we use a kind of feedback bias circuit, which can minimize the effect of the base currents. A 16-bit DAC transistor-level circuit is implemented in 0.18um SiGe process. The simulation results show that the DAC using the proposed architecture has higher resolution, and better static and dynamic performances than the traditional one.

Abstract: This paper proposes method for utilizing the on-chip high resolution pluse width modulation (HRPWM) as a digital-to-analog converter (DAC). The thesis detailedly discusses the basic principle of the design and analyzes the courses of affecting DAC output accuracy.It described the hardware design and the software design ideas. The experimental data shows the effectiveness of the proposed method.

Abstract: In this paper, a novel 4-bit ADC is presented. The ADC adopts interpolated flash architecture with eight preamplifiers followed by fifteen latches. The ECL technique is used in the design of the ADC. Because of the novel design techniques adopted in the ADC, the conversion rate is very fast, up to 10Gsps, which has been proved by the stimulation results.

Abstract: In this paper, a calibration mechanism of sensor based on artificial polycrystalline piezoelectric material and a kind of micro-voltage output system have been designed through understanding the characteristics and the parameters of the capacitive displacement sensor, so as to achieve the sensor calibration interval reaches the piezoelectric ceramic resolution of 5 nm. Through the measured values in the condition that 10mV/100mV is input to piezoelectric ceramic, it can be seen that the design meets the initial requirements. Such mechanism can be used for the calibration of a variety of high-precision sensors; however, it must be used in a stable environment.

Abstract: With the development of electronic technology, the signal generator used in most of the lab employs direct digital synthesis (DDS) technology. The signal generator using digital technology has advantages of high resolution and short conversion time and so on [1, 2]. Through ARM chip STM32F103VET6, we realize the control to the chip AD5791. At the same time, it engender high-accuracy periodic e exponential decremented signal. Doing above, we correct transient electromagnetic system which has been manufactured. The output signal amplitude is 5V. Frequency can be adjusted according to the sampling points and sampling time of the receiving device.