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cheng
滤波器广泛应用于数字信号处理、通信、自动控制领域,但设计可变宽频带有源滤波器则比较困难。利用单片机控制参数可编程的双二阶通用开关电容有源滤波器,精确设置有源滤波器的中心频率f，品质因数Q及有源滤波器的工作方式。本系统主要分为两个部分:即程控滤波器和程控放大器。程控放大器电压增益为40dB，通过单片机控制DA进行分压，可精确实现要求的10dB步进，误差小于0.5 ，通带为100Hz-500KHz，输入电压峰－峰值范围为10mV，在输入范围内无明显失真。由MAX264为核心的滤波器，可设置为高通、低通滤波器。通过单片机直接给出控制频率，使-3dB截止频率在1KHz-20KHz内可调，步进1KHz，误差小于1 。整个系统以52单片机为控制核心，电路简单，性能稳定，且具有较高精度，滤波参数调节通过单片机控制，较为方便。(Filters are widely used in digital signal processing, communications, automatic control area, but the design variable wideband active filter is more difficult. Control parameters using single-chip programmable universal switched-capacitor biquad active filter, active filter accurately set the center frequency f, quality factor Q and the active filter works. The system is mainly divided into two parts: the program-controlled filters and programmable amplifiers. Programmable amplifier voltage gain of 40dB, the DA through the partial pressure of single-chip control, can accurately achieve the required 10dB step, the error is less than 0.5 , passband to 100Hz-500KHz, input voltage peak- the range of 10mV, the input range no significant distortion. By the MAX264 as the core of filter can be set to high pass, low pass filter. Given directly by the microcontroller controls the frequency, the-3dB cutoff frequency at 1KHz-20KHz adjustable, step 1KHz, error is less than 1 . The entire system for)
- 2011-07-17 16:23:27下载
- 积分：1
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STC-CC2520test-program
keil C开发环境，51单片机与cc2520通信测试程序(the a keil C development environment, 51 and cc2520 Communications test program)
- 2020-09-05 23:18:06下载
- 积分：1
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Field-to-FOCUS
超声仿真field ii教程,学习的好帮手(Ultrasound simulation field ii tutorial)
- 2017-01-17 10:01:27下载
- 积分：1
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nlsb_pasapas
L objectif de l essai est de verifier le bon fonctionnement de la
regularisation nonlocale base sur l etat de contrainte dans un calcul
nonlineaire (PASAPAS). Le modeles d endommagement considere pour
le test de validation est le modele MAZARS.
On remarquera, que la regularisation n est pas dependante du modele
et qu elle peut-etre applique a n importe quel modele a partir du
moment ou la variable a regulariser est fournie.
- 2014-12-09 21:28:27下载
- 积分：1
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Function-signal-generator-
用Multisim实现的函数信号发生器，仿真成功，课程设计可以参考利用(Achieved using Multisim function signal generator, successful simulation, curriculum design can refer to the use of)
- 2020-08-09 16:58:31下载
- 积分：1
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12864yejing
12864液晶显示屏、画图、显示中文、文字取模软件(
12864 LCD display, drawing, show Chinese characters modulo Software)
- 2014-07-27 10:01:27下载
- 积分：1
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PS2通信，用stm32单片机模拟键盘鼠标往电脑送数据ps2_02
PS2通信，用stm32单片机模拟键盘鼠标往电脑送数据。(PS2 communication with stm32 SCM simulation to send data to a computer keyboard and mouse.)
- 2020-07-08 14:48:57下载
- 积分：1
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STM32F10x常见应用解析
STM32F1开发指南-库函数版本芯片手册(stm32f1 develop compss)
- 2020-06-20 11:40:02下载
- 积分：1
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SHT1x
数字温湿度传感器SHT1X中文器件手册（PDF及DOC），还包括SHT1X的51例程。SHT1X开发必备。(Digital temperature and humidity sensor device SHT1X Chinese Manual (PDF and DOC), also includes SHT1X 51 routines. SHT1X development essential.)
- 2010-10-16 20:17:02下载
- 积分：1
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mcu51
用于单片机键盘扩展,由于单片机的扩展接口少,而采用这种方法 的,8155用于扩展,(SCM keyboard for expansion, the expansion of microcontroller interface small, and the use of this method. 8155 for the expansion,)
- 2006-11-17 21:00:09下载
- 积分：1
