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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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Digital-Temperature-Sensor
DS18B20 单线数字温度传感器，即“一线器件”，其具有独特的优点：采用单总线的接口方式 与微处理器连接时 仅需要一条口线即可实现微处理器与 DS18B20 的双向通讯。 (
DS18B20-wire digital temperature sensor, that is, first-line devices, it has unique advantages: Only one port line interface mode when using a single bus connection can be realized with a microprocessor of the microprocessor and DS18B20)
- 2016-05-07 22:34:39下载
- 积分：1
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16mul16C52
利用51单片机完成16*16 点阵led屏的字符显示(16*16 led display)
- 2010-08-08 16:51:47下载
- 积分：1
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stm15w408s
一种智能空气净化器控制程序，主控单片机是STM15w408S ，内置智能云系统。(this is STM8 15W408s)
- 2016-12-29 13:02:50下载
- 积分：1
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42X0_Uart
msp430F42X0 TA模拟uart发送程序 (msp430F42X0 TA analog uart sending program)
- 2013-03-26 11:09:54下载
- 积分：1
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TMP112
TI TMP112系列驱动核心部分，采用STM32F103RCT6(The drivers for TI TMP112 by ST stm32f103rct6.)
- 2020-07-26 10:08:42下载
- 积分：1
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12864
12864液晶显示驱动，即Proteus中HDG12864f-3的驱动程序(12864LCD driver, the Proteus in HDG12864f-3driver
)
- 2012-04-17 19:47:27下载
- 积分：1
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main
用PWM方波调节LED亮度P1.1控制LED，低电平点亮K3和K4分别接在P3.4、P3.5，按下时为低电平按K3可调暗LED，按K4可调亮LED(PWM square wave with adjustable LED brightness control P1.1 LED, low light K3 and K4 are connected to the P3.4, P3.5, when pressed by K3 adjustable low dark LED, adjustable by K4 LED light)
- 2011-11-08 08:42:34下载
- 积分：1
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51_C
将百个原创51单片机C程序，提供给那些在校的大学生及单片机初学的朋友作为参考。(The one hundred original 51 single C program, available to college students and those in the microcontroller beginner friends as a reference.)
- 2013-07-09 02:57:28下载
- 积分：1
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0907033PN512_ZLG_Driver
zlg 关于rc522 rc523 pn512的底层代码和14443A 和14443B 只要掌握了这些代码就可以开发对应的M1卡和CPU卡读写程序(ZLG about rc522 rc523 pn512 underlying code and 14443 a and 14443 b as long as to master the code can develop corresponding M1 card and CPU card read and write procedures)
- 2015-02-03 21:24:57下载
- 积分：1
