20mhz oscilloscope

out separately because the requirements for each band are different. The bandwidth of the 2.4-ghz band is only 100MHz, and is even smaller in many countries. Working channels for 802.11B and 802.11g can also be used for 802.11n. But the 40-mhz working mode using 802.11n is not recommended because a large portion of the band will be interfered by a single 40MHz transmission. In addition, it requires that the second 20MHz channel with the original

When we try to write game applications using andengine, if we want to add rich and colorful elements to the game, but try to use particle transmitters, Andengine examples provides three examples to demonstrate the formation of two kinds of dynamic flames. The effect is very vivid. The particle emitter can form a flame. The principle can be understood as similar to that of an oscilloscope to form a graph, the particle transmitter emits custom effect el

isolate the driver, but it took some time but failed. I used an oscilloscope to observe the timing of the four lines and found that there was a problem with the USB to serial line, its sck (7-pin) Outputs a random square wave. The sck sequence from the physical serial port has a frequency of around 20 K and is continuously stable, for example, this may be a problem with the USB-to-serial chip, which is only 20 kb in frequency. Is it filtered out by d

Reproduced on: RS232, RS485 Waveform Analysis I often encounter problems with single-chip serial communication for beginners and do not know how to do it. In fact, the most effective debugging method is to use an oscilloscope to observe the waveforms of the sent and received data. Observe the waveform to determine the following situations: Whether data is received or sent Is the Data correct? Whether the baud rate is correct 1. Serial Data Format

References Before debugging: 1) debug the LCD backlight. The backlight is mainly divided into the built-in PMIC and the independent dcdc. If the backlight is the built-in PMIC, the general platform vendor has done a good job and can directly call the interface, if the driver is a separate dcdc driver, you need to use gpio to control the dcdc's en end. 2) check whether the analog and I/O power of the LCD are normal. 3) configure the control register Interface Based on the LCD resolution, RGB/CPU/

If you want to measure the execution time of a function, how can this problem be solved? I think you should all have your own methods. For me, as long as there is an oscilloscope, I must use GPIO flip and then use the oscilloscope measurement method. If no oscilloscope exists, use the Count in Systick or the Count of the timer. But after a friend's reminder, the

. Why use Mah to represent capacity? We know that the voltage value of lithium battery change is very small, generally between 3.7V to 4.2V, that is, 500mV, so we can take here to take the 4000mAh battery, if the battery with 400mA current discharge, then the battery can use 10h. The use of Mah can also reflect the battery life. Second, the purpose of power consumption debugging 1, to obtain the power consumption data in each state of the equipment, to calculate the battery s

distinguished by Fourier transforms. However, because the analysis is digital sampling, the highest frequency of the signal can be analyzed by its sampling rate, which limits the analysis of the high frequency.For now, the highest analysis frequency is at 10MHz or dozens of MHz, which means that the measurement range is from DC to dozens of MHz.Science has developed to this day, we can measure a signal in many ways, no matter what signal it is. The most basic instrument commonly used is the

conditions 1.4 Bus data transmission order and ACK response IIC bus on the data transmission room MSB before, LSB in the rear, from the oscilloscope, read from left to right in turn The IIC bus transmits the data not to accept the limit, but each send to the SDA must be 8 bits, and the host sent 8-bit after the release of the bus, from the machine received data must be pulled low SDA a clock, response ACK indicates the success of the data received,

replace, if the key press the contact is broken normal, the explanation may be due to virtual welding, desoldering or gold chip hole oxidation, can be measured along the printed line step by step, to find fault for re-welding; if the oxidation of metal pores, the oxide layer can be washed clean, And then re-weld firmly, if the metal hole is completely off and cause the circuit breaker, can be additional solder lead to connect. Common faults Three: if there are multiple keys that are not in the

address is a 7-bit address, and the address configured in the kernel is a real address, this requires special attention. Otherwise, i2c will fail, resulting in loading failure of the camera driver. After configuring the relevant information, start the camera and test it. The camera is stopped and cannot be connected to the device. Capture the related kernel log and find that the match id fails. As a result, the driver cannot be loaded, I initially suspected that the related voltage could not wo

For serial communication, the effect of setting data bit length on communication isIn the serial data communication, you will see the serial port parameter settings. Where the "Data bits" setting, there are four options, namely 8, 7, 6, 5. So how does changing this parameter affect the transfer of data?I'm going to do an experiment, through the oscilloscope to observe the communication process, can analyze the results as follows:For example, the data

signals: Purchase a separate Ad/da module, voice compression chip AMBE2000, speech coding chip CMX649 2. Refer to TI's book 4.3.5 The PN Code Spread spectrum, DDS, Ad/da, demodulation, expansion and other circuit modules to build a complete circuit (difficult on the frame)* * Also, complete spectrum analysis topics2nd phase 2015-7-22one, the infrared optical communication One problem1. Analog part: complete voice transmission over two meters. Commissioning Process: Before

R ) configuration bits. after the plli2s is enabled, the configuration parameters cannot be changed. Ⅲ, Code AnalysisTake the stm32f4x5, X7 series of chips as an example to analyze the configuration of the system clock.Reference Software Engineering:https://yunpan.cn/cRepWDShSK4yc access password 65b11. Frequency multiplier parametercombined with the above clock tree and source code can be seen, the system clock PLLCLK The main calculation is the configuration Pll_m , Pll_n , pll_p these three

in technology. Never go into technology with one mind! Put a lot of pressure on yourself. If you put all your thoughts on this, you will surely become a character like Kong Yiji! That's enough, because technology is only one of the pillars of your future, and it is not the biggest pillar, unless you are willing to be an old engineer! [3] Do not be a technical master, but a general quality master! When we are in a company, we often look down on someone and say, "I don't know anything. Why do we

, line and line between the distance too close or the chip between the level of mismatch, so that the transmission signal has "oscillation" or "reflection" caused by signal interference, so that the chip has anti-interference ability and cause system panic. According to the actual maintenance statistics, the random fault caused by the hardware is about 70% of the total number of failures, which is the main reason of the stochastic failure, and also the part of this article. Stochastic fault anal

chip. 5. Poor anti-interference ability. Chip power cord and ground wire on the printed circuit board wiring width too small, line and line between the distance too close or the chip between the level of mismatch, so that the transmission signal has "oscillation" or "reflection" caused by signal interference, so that the chip has anti-interference ability and cause system panic. According to the actual maintenance statistics, the random fault caused by the hardware is about 70% of the total n

, Literature of Duquennoy, Dunkels [16],lunden, Dunkels [17] and Tsiftes, Dunkels [24].4.1 Micro BenchmarkWe measure individual energy consumption by running Contikimac's Tmote Sky mote. We used a 100 ohm resistor in series with the Tmode Sky power supply and then measured the voltage above the resistor using an oscilloscope. The CONTIKIMAC registers the status of the wireless signal on one of the pins of the tmote Sky I/O, where the high level indica

(10001000), the preceding 1000100 is the address, and the last 0 is a read-write bit. The quorum procedure is to monitor for SDA conflicts when starting the condition and sending the address. SDA output high power at ordinary times, read back is low level, indicating that there is a conflict on the bus. oscilloscope Measurement Need to test SCL,SDA at the same time. The oscilloscope two channel open, respe

"Finishing" 61ic.com "Provider" llz77 "Detailed description" IAR for STM8 exact delay function With the IAR for STM8, there is a project to accurately know the number of delay line delay time is how many, the Internet search under unexpectedly did not, and found that a lot of people ask how such a function, I use oscilloscope measurement to do a precise delay function, to share with you friends. The clock start function (16M crystal oscillator) is