Gated or keyed oscillators are turned on and off rapidly. This type of operation often causes frequency changes or “chirps”. Characterizing the keying characteristics and frequency stability of gated oscillators is an easy job for LeCroy oscilloscopes with the jitter and timing analysis package.
门控或键控振荡器快速打开和关闭。这种类型的操作通常导致频率变化或 “唧唧喳喳”。表征键控特性和门控频率稳定性石英晶体振荡器是一项简单的工作带的勒罗伊示波器抖动和时序分析包裹。

Figure 1 shows a typical measurement on a 315MHz keyless entry system transmitter. This type of device uses a keyed continuous wave (cw) transmitter to send digital information to the receiver located in a vehicle. Data is encoded by controlling the width of the burst.
图1显示了一个典型的在315MHz上测量无钥匙进入系统发射机。这种设备使用键控连续波发送数字信号的发射器给接收者的信息位于车辆中。数据是通过控制爆发的宽度。

Of interest to the designer is the shape of the gated burst envelope and the frequency variation as the oscillator is keyed. The shape of the envelope affects the spurious content of the signal. Likewise, frequency or phase modulation of the carrier caused by the gating the oscillator affects signal purity. Either of these effects can result in out of band signal components and a potential for failure to meet emissions certification requirements
设计者感兴趣的是门控脉冲的形状包络和频率石英晶体振荡器的变化键控。的形状包络影响杂散信号的内容。同样的，频率或相位调制造成的承运人的门控振荡器会影响信号纯度。这些中的任何一个影响可能导致带外信号分量和未能满足的可能性排放认证要求。

In figure 1 the leading edge of the transmitted waveform is captured in channel 2 shown as the top trace. Trace A contains the extrema math function called roof, which extracts the peak values of each cycle of the transmitted signal. This trace is used to evaluate the risetime of the burst. The risetime parameter appears on the first line of the parameter readout located directly below the displayed traces.
在图1中，前缘传输的波形是在通道2中捕获，显示为顶部轨迹。石英晶振 跟踪A包含极值数学函数称为roof，它提取每个周期的峰值传输信号。这个痕迹是用于评估的上升时间爆裂。上升时间参数出现在第一个参数读数的行位于正下方显示的痕迹。

Trace B, third from the top, contains the JitterTrack function of frequency and shows the variation in frequency as a function of time. Note that the frequency converges to the nominal 315 MHz in about 250 ns. The bottom trace contains the JitterTrack of cycle to cycle period variation. Both of these functions allow the user to specify the amplitude threshold and hysteresis level. This allows the user to start the measurement only after the signal has achieved a reasonable level. The threshold level appears as a dotted horizontal line of the source waveform(CH2). Note that the JitterTrack function do not start until the threshold level is achieved. This avoids errors caused by reading noise at the beginning of the waveform.
迹线B，从上面数第三个，包含抖动轨迹频率和的函数显示了中的变化频率是时间的函数。请注意频率收敛到标称值315大约250纳秒。这底部轨迹包含周期到周期的抖动跟踪周期变化。这两个功能允许用户指定振幅阈值和滞后水平。这允许用户启动测量仅在信号已经达到合理水平。阈值水平显示为水平虚线来源行波形(CH2)。请注意抖动跟踪功能不启动直到阈值水平被已实现。这避免了错误由读取噪音引起波形的开始。

贴片石英晶振	品牌	系列	Description描述
CPPC5-A7BP-80.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 80.000MHZ CMOS SMD
CPPC7LZ-A7BR-36.864TS	Cardinal晶振	FIPO™ CPP	OSC XO 36.864MHZ CMOS SMD
CPPLC7LT-BR-100.0TS	Cardinal晶振	FIPO™ CPPL	OSC XO 100.000MHZ CMOS SMD
CPPC7L-B6-64.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 64.000MHZ CMOS SMD
CPPC7LZA7BP-25.0000TS	Cardinal晶振	FIPO™ CPP	OSC XO 25.000MHZ CMOS SMD
CPPC7LZA7BP-3.579540TS	Cardinal晶振	FIPO™ CPP	OSC XO 3.57954MHZ CMOS SMD
CPPC7LZA7BP-3.68640TS	Cardinal晶振	FIPO™ CPP	OSC XO 3.6864MHZ CMOS SMD
CPPC7LZ-A7BP-14.318TS	Cardinal晶振	FIPO™ CPP	OSC XO 14.318MHZ CMOS SMD
CPPC7L-A5BR-66.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 66.000MHZ CMOS SMD
CPPC7L-A5BR-8.192TS	Cardinal晶振	FIPO™ CPP	OSC XO 8.192MHZ CMOS SMD
CPPC7L-B6-40.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 40.000MHZ CMOS SMD
CPPC7-A7BR-180.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 180.000MHZ CMOS SMD
CPPC7L-A7BP-63.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 63.000MHZ CMOS SMD
CPPC7L-A5BR-66.0PD	Cardinal晶振	FIPO™ CPP	OSC XO 66.000MHZ CMOS SMD
CPPC7L-A7BP-11.0592TS	Cardinal晶振	FIPO™ CPP	OSC XO 11.0592MHZ CMOS SMD
CPPC7L-A5B6-11.059TS	Cardinal晶振	FIPO™ CPP	OSC XO 11.0592MHZ CMOS SMD
CPPC7L-A7BR-30.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 30.000MHZ CMOS SMD
CPPC7L-A7B6-130.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 130.000MHZ CMOS SMD
CPPC7L-A5B6-18.432TS	Cardinal晶振	FIPO™ CPP	OSC XO 18.432MHZ CMOS SMD
CPPC7L-A5B6-22.1184TS	Cardinal晶振	FIPO™ CPP	OSC XO 22.1184MHZ CMOS SMD
CPPC7-A7BP-28.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 28.000MHZ CMOS SMD
CPPC7L-A7B6-16.0PD	Cardinal晶振	FIPO™ CPP	OSC XO 16.000MHZ CMOS SMD
CPPC7L-A5BP-100.0PD	有源晶振	FIPO™ CPP	OSC XO 100.000MHZ CMOS SMD
CPPC7L-A5BP-100.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 100.000MHZ CMOS SMD
CPPC7L-A5BP-2.048TS	Cardinal晶振	FIPO™ CPP	OSC XO 2.048MHZ CMOS SMD
CPPC7L-A5BP-25.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 25.000MHZ CMOS SMD
CPPC7L-A7BP-12.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 12.000MHZ CMOS SMD
CPPC7L-A5BP-25.1658TS	Cardinal晶振	FIPO™ CPP	OSC XO 25.1658MHZ CMOS SMD
CPPC7L-A5BP-31.25TS	Cardinal晶振	FIPO™ CPP	OSC XO 31.25MHZ CMOS SMD
CPPC7L-A7BR-32.768TS	Cardinal晶振	FIPO™ CPP	OSC XO 32.768MHZ CMOS SMD
CPPC7-A7BR-200.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 200.000MHZ CMOS SMD
CPPC7L-A5BP-60.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 60.000MHZ CMOS SMD
CPPC7L-A5BP-62.5TS	Cardinal晶振	FIPO™ CPP	OSC XO 62.50MHZ CMOS SMD
CPPC7L-A7BP-125.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 125.000MHZ CMOS SMD
CPPC7L-A5BP-66.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 66.000MHZ CMOS SMD
CPPC7L-A5BR-16.896TS	Cardinal晶振	FIPO™ CPP	OSC XO 16.896MHZ CMOS SMD
CPPC7L-A7BR-33.3333TS	Cardinal晶振	FIPO™ CPP	OSC XO 33.3333MHZ CMOS SMD
CPPC7L-A5BR-24.4196TS	Cardinal晶振	FIPO™ CPP	OSC XO 24.4196MHZ CMOS SMD
CPPC7-A7BR-210.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 210.000MHZ CMOS SMD
CPPC7L-A5BR-24.6945TS	Cardinal晶振	FIPO™ CPP	OSC XO 24.6945MHZ CMOS SMD
CPPC7L-A5BR-25.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 25.000MHZ CMOS SMD
CPPC7L-A7BR-40.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 40.000MHZ CMOS SMD
CPPC7L-A7BP-16.0000TS	Cardinal晶振	FIPO™ CPP	OSC XO 16.000MHZ CMOS SMD
CPPC7L-A5BR-34.56TS	Cardinal晶振	FIPO™ CPP	OSC XO 34.56MHZ CMOS SMD
CPPC7L-A5BR-40.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 40.000MHZ CMOS SMD
CPPC7L-A5BR-62.208TS	Cardinal晶振	FIPO™ CPP	OSC XO 62.208MHZ CMOS SMD
CPPC7L-A7BR-10.368TS	Cardinal晶振	FIPO™ CPP	OSC XO 10.368MHZ CMOS SMD
CPPC7L-A7B6-24.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 24.000MHZ CMOS SMD
CPPC7L-A7BP-100.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 100.000MHZ CMOS SMD
CPPC7L-A7BP-62.5TS	Cardinal晶振	FIPO™ CPP	OSC XO 62.50MHZ CMOS SMD
CPPC7L-A7BR-28.63636TS	Cardinal晶振	FIPO™ CPP	OSC XO 28.63636MHZ CMOS SMD
CPPC7-A7BP-25.175TS	Cardinal晶振	FIPO™ CPP	OSC XO 25.175MHZ CMOS SMD
CPPC7L-A7BR-32.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 32.000MHZ CMOS SMD
CPPC7-A7BR-20.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 20.000MHZ CMOS SMD
CPPC7L-A7BP-78.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 78.000MHZ CMOS SMD
CPPC7L-A7B6-16.384TS	Cardinal晶振	FIPO™ CPP	OSC XO 16.384MHZ CMOS SMD
CPPC7-A7BP-29.4912TS	Cardinal晶振	FIPO™ CPP	OSC XO 29.4912MHZ CMOS SMD
CPPC7L-A7BP-8.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 8.000MHZ CMOS SMD
CPPC7-A7BP-3.6864PD	Cardinal晶振	FIPO™ CPP	OSC XO 3.6864MHZ CMOS SMD
CPPC7L-A7B6-22.0000TS	Cardinal晶振	FIPO™ CPP	OSC XO 22.000MHZ CMOS SMD
CPPC7L-A7BP-81.92TS	Cardinal晶振	FIPO™ CPP	OSC XO 81.92MHZ CMOS SMD
CPPC7-A7BR-211.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 211.000MHZ CMOS SMD
CPPC7L-A7BR-40.32TS	Cardinal晶振	FIPO™ CPP	OSC XO 40.32MHZ CMOS SMD
CPPC7-A7BP-30.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 30.000MHZ CMOS SMD
CPPC7-A7BR-28.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 28.000MHZ CMOS SMD
CPPC7L-A7BR-40.5PD	Cardinal晶振	FIPO™ CPP	OSC XO 40.50MHZ CMOS SMD
CPPC7L-A7BP-2.0TS	Cardinal晶振	FIPO™ CPP	OSC XO 2.000MHZ CMOS SMD

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