 The reference clock as well as a direct clock can be fed-in externally.
The reference clock as well as a direct clock can be fed-in externally. Internal and external clock reference.
Internal and external clock reference.几乎任何配有GPS天线并利用GPS作为参考时钟的NTP服务器,都可以很容易受到黑客攻击。  Almost any NTP servers leveraging on GPS as a reference clock is equipped with a GPS antenna that could be easily targeted by hackers.
Almost any NTP servers leveraging on GPS as a reference clock is equipped with a GPS antenna that could be easily targeted by hackers.卫星信号参考时钟频率f0为10.23MHz,信号载波L1的中心频率为f0的154倍频,即:.  The satellite signal reference clock frequency f0 is 10.23 MHz, and the center frequency of the signal carrier L1 is 154 times the frequency of f0, ie:.
The satellite signal reference clock frequency f0 is 10.23 MHz, and the center frequency of the signal carrier L1 is 154 times the frequency of f0, ie:.Combinations with other parts of speech
外部输入参考时钟必须有40%到60%的占空比,在VDD/2时进行测量。  External input reference clock must have a duty cycle between 40% and 60%, measured at VDD/2.
External input reference clock must have a duty cycle between 40% and 60%, measured at VDD/2.AD9854参考时钟的输入有单端输入和差分输入两种方式,为了使电路简单,本设计选用单端输入方式。  AD9854 reference clock input with single-ended input and differential input in two ways, to make a simple circuit, the design uses a single-ended input mode.
AD9854 reference clock input with single-ended input and differential input in two ways, to make a simple circuit, the design uses a single-ended input mode.DP83867EVM能够从板载25MHz晶体提供一个125MHz参考时钟。  The DP83867 EVM is capable of providing a 125MHz reference clock from an onboard 25MHz.
The DP83867 EVM is capable of providing a 125MHz reference clock from an onboard 25MHz.因此,调谐字将输出频率定义为参考时钟频率的一部分。  Therefore, the tuning word defines the output frequency as a fraction of the reference clock frequency.
Therefore, the tuning word defines the output frequency as a fraction of the reference clock frequency.图4中的电路需要一个运算放大器、一个开关和一些分立元器件,另外还需要微处理器提供参考时钟。  The circuit shown in Figure 4 requires an op amp, a switch,and some discrete components, plus a reference clock from a microcontroller.
The circuit shown in Figure 4 requires an op amp, a switch,and some discrete components, plus a reference clock from a microcontroller.支持参考时钟,并且以与远程服务器相同的方式对偏移进行过滤和分析,尽管它们通常更频繁地轮询。  Reference clocks are supported and their offsets are filtered and analysed in the same way as remote servers, although they are usually polled more frequently.
Reference clocks are supported and their offsets are filtered and analysed in the same way as remote servers, although they are usually polled more frequently.由于微处理器参考时钟所需的一般频率容差为±2%-3%,因此标准单元满足此要求。  As the general frequency tolerance required for the reference clock of microprocessors is +2%- 3%, standard units meet this requirement.
As the general frequency tolerance required for the reference clock of microprocessors is +2%- 3%, standard units meet this requirement. Represents the maximum error of the local clock relative to the reference clock.
Represents the maximum error of the local clock relative to the reference clock.RootDelay:本地到主参考时钟源的往返时间。  Root delay Root delay from local equipment to the master reference clock.
Root delay Root delay from local equipment to the master reference clock. The frequencies are generated from a single reference clock.
The frequencies are generated from a single reference clock. The frequencies are generated from a single clock reference.
The frequencies are generated from a single clock reference.在闰秒事件的当天,ntpd从配置文件、附加参考时钟或远程服务器收到通知。  On the day of a leap second event, ntpd receives notification from either a configuration file,an attached reference clock, or a remote server.
On the day of a leap second event, ntpd receives notification from either a configuration file,an attached reference clock, or a remote server.所以本质上我们得到相同的RX580,超频15%,至少在比较参考时钟速度时。  So in essence we're getting the same RX 580 with a 15% overclock,at least when comparing the reference clock speeds.
So in essence we're getting the same RX 580 with a 15% overclock,at least when comparing the reference clock speeds.对于大多数测试软件来说,RTC都被作为执行测试代码时的参考时钟。  For most benchmark applications, the RTC is used as reference clock when executing the benchmark code.
For most benchmark applications, the RTC is used as reference clock when executing the benchmark code.源包括参考时钟中的抖动,该抖动位于实际DDS电路之外但仍会影响最终性能。  Sources include jitter in the reference clock, which is outside the actual DDS circuitry but still affects final performance.
Sources include jitter in the reference clock, which is outside the actual DDS circuitry but still affects final performance.这些可以访问同步数字(标记)输出、触发输出、仪器运行和arm状态、锁相环参考时钟或异步I/O线。  These give access to synchronous digital(marker) outputs, trigger output, the instruments run and arm status,the PLL reference clock or asynchronous I/O lines.
These give access to synchronous digital(marker) outputs, trigger output, the instruments run and arm status,the PLL reference clock or asynchronous I/O lines.使用一个参考时钟允许设计人员简化设计,并在保持精确度的同时节省电路板空间。  Using a single reference clock allows designers to simplify design and save board space while still maintaining accuracy.
Using a single reference clock allows designers to simplify design and save board space while still maintaining accuracy.NTP用于将计算机客户或服务器的时间同步到另一服务器或参考时钟源。  The Network Time Protocol(NTP) is used to synchronize the time of a computer client orserver to another server or reference time source.
The Network Time Protocol(NTP) is used to synchronize the time of a computer client orserver to another server or reference time source.这是完全屏蔽,包括一个集成的高频率的参考时钟,使它的体积最小,成本最低的,完整的802.11b/g解决方案在市场。  It is fully shielded and includes an integrated high-frequency reference clock, making it the smallest and lowest-cost, complete 802.11b/g solution in the market.
It is fully shielded and includes an integrated high-frequency reference clock, making it the smallest and lowest-cost, complete 802.11b/g solution in the market. During the relock time,the affected PLL is not usable as a clock reference.
During the relock time,the affected PLL is not usable as a clock reference.PLL时钟参考频率必须在范围3.579545MHz到16.384MHz(包含其本身)。  The frequency of the PLL clock reference must be in the range of 3.579545 MHz to 8.192 MHz(inclusive).
The frequency of the PLL clock reference must be in the range of 3.579545 MHz to 8.192 MHz(inclusive).PLL时钟参考频率必须在范围3.579545MHz到16.384MHz(包含其本身)。  PLL clock reference must be in the range of 3.579545 MHz to 8.192 MHz(inclusive).
PLL clock reference must be in the range of 3.579545 MHz to 8.192 MHz(inclusive).这种实现可以保持较小的不确定性(通常小于10ms),主要是借助于现代时钟参考值(比如GPS和原子钟)。  This implementation keeps uncertainty small(generally less than 10ms)by using multiple modern clock references(GPS and atomic clocks)..
This implementation keeps uncertainty small(generally less than 10ms)by using multiple modern clock references(GPS and atomic clocks).. To a reference clock.
To a reference clock.