20mhz oscilloscope

specific tasks at some point, so almost every circuit has a pin that receives an external clock signal. If this clock signal is chaotic. The entire circuit is not working properly. In a monolithic device, such as a development board, or a PC motherboard. All circuits usually share a crystal oscillator. Easy to keep the parts in sync. In some communication systems, the basic frequency and radio frequency use different crystal oscillator, and the method of electronic frequency adjustment to maint

;" >0-20mhz ) and 1.9v (0-25mhz ) four levels. vcore is dependent on the selected mclk size, that is, high frequency need to support the higher vcore . 　　Management will generate a reset (mainly during power-up ), and the monitoring will generate interrupts (monitoring voltage is too low).Our most common use is to set the core voltage VCORE , fortunately there is a special library of functions hal_pmm.c/h . in this library, in addition to the d

relationship between them. instruction Cycle: is the CPU's key indicator, which refers to the time to take out and execute an instruction. In general, the machine cycle is the unit, single instruction execution cycle, double instruction execution cycle, etc. Most of the current processor instructions (ARM, DSP) use a single instruction execution cycle. Machine Cycle: complete a basic operation of the time unit, such as the reference period, take the number of cycles. Clock cycle: The inverse of

OFDMA (Orthogonal Frequency Division multiplexing), upstream connection using SC-FDMA;5.LTE network is called flat architecture, compared with 3G network, the function of RNC is removed in architecture, so ENB must have the function of Base station and base station controller.6.LTE design target: At 20MHZ bandwidth, can provide 100mbit/s downlink rate and 50mbit/s uplink rate, improve the performance of the Edge network, allow the seamless integratio

have been doing the LTE physical layer related work, there has been a doubt, in 36.211 the beginning of a chapter defines the size of TS is 1/(15000*2048) s, why define so a strange unit time.Recently, this was related to the FFT/IFFT process.Assuming 20MHz bandwidth, the standard specifies that we use 2048 points to do the FFT process, the FFT process is the time domain, each time domain symbol has 2048 time domain sample, FFT, converted into the fre

get more for less.· A quick perusal of the data sheet shows that the devices are roughly equivilent, but the HC version has a much higher allowable clock frequency (100MHz vs 20MHz), this is good as far as the super fast SX is concerned.As others have stated, the LS series is based on TTL (total transistor logic) which means that·thay are made with·bipolar transisitors (BJT).· BJT's were·one of the first transistors used in ICs.The HC series use CMOS

Whdi (Wireless home Digital Interface, the Wireless Family Digital Interface) sets a new standard for wireless high-definition video connectivity. It provides a high quality, uncompressed wireless connection. The MIMO technology and the OFDM modulation method can achieve up to 3Gbps transmission speed. Working in the 4.9ghz~5.875ghz band, 20MHz or 40MHz channels, in line with the global 5GHz spectrum, the range is within 30 meters, can penetrate the

adapter is an old product that can only support WEP encryption, check the vendor's Web page for driver updates to make sure Windows is up to date. If this is not helpful, you can switch to a new wireless network card. In the browser, enter the IP address, login routing Configuration tool, change the encryption settings. The default IP and password should be listed in the document. Locate the wireless settings and change the encryption type. 5, change the default bandwidth, get efficient speed

the current architectures are as follows. Single processor: Balance generally to good, performance low to Medium.Shared memory: Poor balance, scalability, average performance.Vector machine: good balance, medium scalability, good performance.Distributed Memory: The equalization is general, the expansibility is good, the performance is good. Computer Architecture List Single-processor architecture In a tiered-storage computer, the key factor determining persistent memory bandwidth for a CPU is t

the cable. The transmission frequency of the cable is 16MHz, for voice transmission and the highest transmission rate for 10[please use civilized language]ps data transmission, mainly for 10base-t Four categories: This type of cable transmission frequency of 20MHz, for voice transmission and maximum transmission rate 16[Please use civilized language]ps data transmission, mainly used in token based LAN and 10BASE-T/100BASE-T. Five categories: This t

PLL is a feedback circuit, the full name of the PLL is phase-locked Loop, referred to as the PLL. The function is to synchronize the clock on the circuit with the phase of an external clock. Because the PLL can realize the output signal frequency to the input signal frequency automatic tracking, so the phase-locked loop is usually used for the closed-loop tracking circuit. Phase-locked loop during operation, when the output signal frequency and the frequency of the input signal is equal, the out

can have a large increase, and even can reach the original 802.11n several times the speed. How the 802.11AC works 802.11AC core technology is mainly based on 802.11a, continue to work in the 5.0GHz band to ensure backward compatibility, but the data transmission channel will be greatly expanded, on the basis of the current 20MHz to 40MHz or 80MHz, and may even reach 160MHz. Plus about 10% of the actual frequency modulation efficiency increases, t

asynchronous, at the time of synchronization it is 5-48mhz, when asynchronous X-20mhz (where x can be very small), In our project, we implemented a read/write FIFO of 200khz to 48mhz. Wakeup, used to wake up the sleeping USB, generally we also use 100k resistor to pull to 3.3v. It is only used when you are very careful about power consumption. Reset, Reset, eliminates the hassle of repeatedly plugging the device, but only if you are using a bus-pow

also be extended to 20MHz. 3. Single receive path, cancel RX Diversity dual channel. 4. Low-speed data rate. Not only reduces the rate requirements, but also reduces processor computing power and storage capacity. Further optimizations are also available in the R13 version, such as canceling the transmit diversity, supporting MIMO, supporting less than 1.4MHz of bandwidth, and supporting a lower data rate. The features of the cat.0, Cat.1, Cat.4, and

influenced by the interference control, so the base station layout, antenna height and so on are more stringent. Mobility is mainly through soft switching, and the influence of different frequency measurement on network performance and communication quality is relatively large and should be controlled. The preferred Multicarrier expansion scheme is recommended, and does not imply an absolute rejection of other modes of expansion. Nortel Network typical Acer cellular base station BTS12000 in a

Address: http://blog.csdn.net/enlaihe/article/details/7598941 See a lot of the Assembly on the return of the program and the return of the processing address are very special, think about the original pipeline effect. So, decided to summarize learning under arm pipeline. The ARM7 processor uses a Class 3 pipeline to increase the speed of the processor instruction stream, providing 0.9mips/mhz instruction processing speed. Ps: MIPS (Million instruction per Second) indicates how many millions in

High-frequency bypass capacitance is generally relatively small, according to the resonant frequency is generally 0.1u,0.01u, and the decoupling capacitance is generally larger, is 10u or larger, according to the distribution parameters in the circuit, as well as the change in the driving current size to determine. The typical decoupling capacitance value in a digital circuit is 0.1μf. The typical value of this capacitance's distribution inductance is 5μh. 0.1μf decoupling capacitor has a 5μh d

the problem is, since it is multipath, there are long and short distances, some may be reflected from the table, and some may be through the wall, which carry the same information but with different phases of the signal to the end together to the receiving end. Modern communication is the packet exchange of storage and forwarding, also called Packet Exchange, the transmission is code (SYMBOL). The ISI (intersymbolinterference) is caused by the different transmission delay of the barrier. To avo

skb,skb in a domain called Control_buffer, that is, SKB->CB, is a 48-byte memory area, this area is designed to store some private data in each layer of the protocol stack, when the packets are passed between different layers, such as from the network layer to the link layer, the data of this domain is useless, can safely be written to the new data by the link layer, Link layer in the data packet to the physical layer to send, you need to specify a number of parameters, such as the packet to us

and access the entire network. SSID Number: This item identifies the network name of the wireless network and can be changed at will. Channel: This entry is used to select the frequency band (1-13) where the wireless network works. Mode: This item is used to select the working mode of the router, which can be selected with 11M bandwidth 802.11b mode, 54M bandwidth 802.11g mode, 300M 802.11n mode, 802.11b/g blending mode and 802.11b/g/n blending mode. Band Bandwidth: Automatic,