基于STM32的MicroOLED快速自适应Gamma校正

基于STM32提出了一种MicroOLED快速自适应Gamma校正算法,首先对MicroOLED内部Gamma寄存器线性赋值,测量多个灰度值下亮度,再拟合出亮度值和数据电压之间的关系式,根据关系式对Gamma寄存器的值精确修改,可快速实现不同γ值的校正,为抑制Gamma曲线随亮度的偏移,引入多电压曲线拟合,使整个设备可以实现亮度自适应Gamma校正。实验证明了该算法在头戴式显示领域具有很大的应用价值。     

基于STM32的可编程函数信号发生器设计

该文设计了一种基于STM32和DAC8871的可编程函数信号发生器。该装置由STM32子系统、DA转换电路、电压基准电路、Flash存储电路、波形选择电路及显示电路六大部分组成。该装置采用SPI通信方式,可同时产生六种幅值可调(可达±15V)、频率可变的不规则波形信号。     

基于STM32的MPPT光伏汇流箱设计

提出了一种以STM32F103为控制芯片的MPPT汇流箱的设计方法,一片STM32F103控制四路BOOST电路,四路控制脉冲相位互错90度,以减小输出纹波;RS485主从式的通讯架构;采用基于功率预测的MPPT算法,电压外环电流内环的控制方法;基于最小时间片的软件设计。     

并联型有源电力滤波器控制器的设计

本文设计的基于三相四线制APF控制器,采用STM32和FPGA双系统架构,利用STM32操作灵活、控制简单及其丰富的内部资源,完成实时检测三相电网电压、电流、三相负载电流、直流侧电压以及三相逆变器的输出电流等信号;利用FPGA的高速并行特性,产生8路PWM信号;两芯片协同工作,优势互补。     

基于Proteus的LCD数字电压表的设计与仿真

本文中数字电压表的控制系统采用AT89C51单片机,A/D转换器采用ADC0809为主要硬件,实现数字电压表的硬件电路与软件设计。该系统的数字电压表电路简单,所用的元件较少,成本低,调节工作可实现自动化。还可以方便地进行8路A/D转换量的测量,远程测量结果传送等功能。数字电压表可以测量0～5V的8路输入电压值,并在LCD液晶显示屏上显示出来。     

基于FPGA和STM32的空管雷达数据协议转换器设计

雷达数据协议转换器是空管多雷达处理系统的重要组成部分。它将多路HDLC协议的雷达数据转换成单路IP数据,然后传入多雷达数据处理系统,避免系统为引接多路雷达数据而安装多个HDLC串口卡,较少的接线提高了系统可靠性。该设计提出了一种基于FPGA+STM32的雷达数据协议转换器设计方案,利用FPGA在并行处理方面的优势实现多路HDLC雷达数据的实时采集,FPGA与STM32之间采用串口协议进行通信,由STM32控制W5500以太网芯片完成数据的协议转换。最后,通过实验验证了该设计的可行性和有效性。     

嵌入式数字存储示波器设计

提出了一种基于FPGA和STM32的嵌入式数字存储示波器设计,以STM32为控制核心,FPGA作为数据采集和处理模块,完成了对外部信号的采集和传输,实现了存储示波器数据处理和显示的功能.     

继电保护中多路模拟量采集系统的设计

介绍了一种基于高性能浮点DSP芯片TMS320C32、CPLD芯片XC95288和A/D采样芯片AD976组成的多路采集系统的工作原理以及设计方法。通过对第一路施加特殊的电压量,在CCS开发环境下读取采样缓冲区的值,并利用Matlab对采样数据进行了全波傅氏变换。此外,该系统已在继电保护中得到广泛应用,实践表明,该系统能较好地解决多路模拟量的采集,并确保了采样数据的安全可靠性。     

基于STM32的多通道旋转变压器-数字转换

旋转变压器是伺服电机控制系统中的常用位置传感器,但其输出是含有角度量的模拟电压信号,不能直接用于数字化伺服系统。利用旋转变压器信号的相频特性,用STM32微控制器实现同时对多通道旋转变压器信号的数字转换,这种方法解决了传统A/D转换器信号转化速度慢且不能同时转换的难题。     

基于STM32的多通道旋转变压器-数字转换

旋转变压器是伺服电机控制系统中的常用位置传感器,但其输出是含有角度量的模拟电压信号,不能直接用于数字化伺服系统。利用旋转变压器信号的相频特性,用STM32微控制器实现同时对多通道旋转变压器信号的数字转换,这种方法解决了传统A/D转换器信号转化速度慢且不能同时转换的难题。     

1.5 μm CMOS gate arrays with analog/digital macros designedusing common base arrays

Mixed analog and digital circuits are realized on a 1.5 μm silicon-gate CMOS chip with +5 V power supply only. The circuit uses CMOS digital gate arrays of 0.32 K to 19.6 K cells and is created without any additional turnaround time or any restriction on the design. Typical internal digital gate (two-input NAND) speed, with a fanout of 3 and a wire length of 3 mm, is 1.4 ns. A voltage comparator with ±8 mV maximum input offset voltage and 60 ns response time, digital-to-analog and analog-to-digital converters with 4-, 6-, and 8-bit resolution, respectively, and an analog switch of 25 Ω on-resistance can be realized on the same chip with digital circuits. Using this technology, about one-tenth of the turnaround time can be achieved compared with full-custom LSIs for the same system. The product development flow and computer-aided-design tools for designing mixed analog and digital gate arrays are the same as for digital gate arrays     

基于51单片机的数字电压表仿真设计

设计采用AT89C51单片机、A/D转换器ADC0808和共阳极数码管为主要硬件,分析了数字电压表Proteus软件仿真电路设计及编程方法。将单片机应用于测量技术中,采用ADC0808将模拟信号转化为数字信号,用AT89C51实现数据的处理,通过数码管以扫描的方式完成显示。设计的数字电压表可以测量0~5 V的电压值,AT89C51为8位单片机,当ADC0808的输入电压为5V时,输出数字量值为＋4.99V。本设计电路简单、成本低、性能稳定。     

采用COSTAS环路的全制式音视频IF锁相环设计

一种能解决全电视制式的音视频锁相环设计,在I2C总线控制下与AFC(数字自动频率控制)相配合,完成了视频信号与音频信号的快速捕捉锁定与实时追踪,解决了调谐器需要人为操控完成制式转换的问题。文章详细阐述了完整设计过程,解决了模块级设计、仿真验证与版图设计中的关键技术。该设计的电路模块包括偏置电路及其启动电路、基准电压源、FPLL检波器、压控振荡器、窄带FM-PLL、Nf频率合成器、数字AFC、I2C总线控制器等。并对模拟乘法器、COSTAS环鉴频辅助器、VCO振荡控制范围及低噪设计、窄带PD等功能以及完整系统,采用Spectre仿真器进行了仿真验证。电路设计兼顾双极模拟电路与数字电路的优点,电路结构设计充分考虑了应用兼容性,并在音视频信噪比、锁相精度等多项性能指标上有了很大提高,使用外围简单且操作灵活。     

Design and optimization of Flash type Analog to Digital converter using Augmented Sleep Transistors with Current Mode Logic

This paper represents the low leakage & the delay performance optimization of Flash type Analog to Digital converter using Augmented Sleep Transistors with Current Mode Logic (ASTCML) at 45 nm technology. It is realized that the leakage power is reduced 50% approximately in ASTCML logic based analog to digital converter design at 1 V supply voltage. Due to reduced leakage power, the probability of causing thermal runaway is decreased and the design stagnation is increased. Even though the featured analog to digital converter is designed using combination of PMOS & NMOS. The anticipated analog to digital converter is appropriate for high speed and wireless network application. In this paper, different consecutive designs with flash type analog to digital converter are represented.     

低功耗RFID电源产生电路的优化设计

电子标签是创新消费模式、提升生活质量和工作效率的热门新科技,但是由于功耗和成本的原因阻碍了其广泛应用.介绍了一种电子标签芯片电源产生电路的优化设计,探讨了限幅电路、整流电路、模拟电源电路、数字电源电路和EEPROM高压电路的低功耗设计技术和实现方法,提出了融合并联分流的限幅电路、改进的桥式整流电路、带有低压检测复位功能的模拟电源电路.低功耗电源产生电路已成功应用到无源电子标签芯片的设计中,并在SMIC O.35μmCMOS工艺下流片成功.     

Measurement of digital noise in mixed-signal integrated circuits

This paper proposes a method of measuring the influence of digital noise on analog circuits using wide-band voltage comparators as noise detectors. Noise amplitude and r.m.s voltage are successfully measured by this method. A test chip is fabricated to measure the digital noise influence. From the experimental results, it is shown that the digital noise influence can be considerably reduced by using a differential configuration in analog circuits for mixed-signal IC's. The digital noise influence can be further reduced by lowering the digital supply voltage. These results show that the voltage-comparator-based measuring method is effective in measuring the influence of digital noise on analog circuits     

ADC外围电路的设计

ADC外围电路的设计通常包括模拟电路、数字电路和电源电路的设计。为了满足ADC的需要,ADC外围电路的设计重点是输入放大信号,为了使其充分发挥整体性能,必须在ADC转换期间保持输入电压的稳定;为了消除模拟多路开关因阻抗不匹配和转换阶跃信号变化对ADC输入及采样阶段的影响,需在多路开关与ADC之间加接高输入阻抗的电压跟随器,并待阶跃变化稳定后,再让采样保持电路进入采样阶段;为了满足微控制器对时序的要求,必须选择恰当的接口形式。此外,采用良好的接地方式与电压去耦方法,可以避免模拟信号和数字信号受到噪声干扰,也可避免两种信号产生互相干扰。为了防止噪声对数字信号的影响,还使用了相应的隔离方式。     

Advanced controlling scheme for a DRAM voltage generator system

An brief overview is given of the voltage generator system of a 1-Gb synchronous DRAM. The design serves as an example for a state-of-the-art DRAM voltage generator system. A general analysis of the required controlling functionality is derived. A universal and flexible controlling scheme for a voltage generator system is presented, which can easily be modified for future voltage generator design. The main aspect of this controlling scheme is a clear separation between logic (digital) controlling functions and (analog) voltage generating functions. A control path that supplies the various voltage generator blocks with configuration information is introduced. Last, the control path is shown to have an additional advantage of increased testability. Hardware results verifying the concept are presented     

Switched-current circuit design issues

Switched-current (SI) circuits represent a current-mode analog sampled-data signal processing technique realizable in standard digital CMOS technologies. Unlike switched-capacitor (SC) circuits, SI circuits require only a standard digital CMOS process. SI circuits use MOS transistors as the storage elements to provide analog memory capability. Similar to the operation of dynamic logic circuits, a voltage is sampled onto the gate of a MOSFET and held on its noncritical gate capacitance. The held voltage signal on the gate causes a corresponding held current signal in the drain, usually proportional to the square of the gate-to-source voltage. Design issues related to the implementation and performance of SI circuits are presented. SI filters show comparable performance to SC filters except in terms of passband accuracy. The major source of error is nonunity current gain in the SI integrator due to device mismatch and clock-feedthrough effects. For the initial CMOS prototypes, the current track and hold (T/H) gain error was about 2.5%     

微机控制蓄电池监测系统

本文介绍了微机控制分布式蓄电池监测系统的设计。它用在对工业蓄电池的电压和环境温度进行实时监测,在PIC16C73A控制下,把测量结果通过RS-485通讯口传送给主机,然后由主机判断电池电压,温度等参数是否正常,以防止因电池故障而导致的系统瘫痪。