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.
門控或鍵控振蕩器快速打開和關(guān)閉。這種類型的操作通常導(dǎo)致頻率變化或 “唧唧喳喳”。表征鍵控特性和門控頻率穩(wěn)定性石英晶體振蕩器是一項簡單的工作帶的勒羅伊示波器抖動和時序分析包裹。

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.
圖1顯示了一個典型的在315MHz上測量無鑰匙進(jìn)入系統(tǒng)發(fā)射機(jī)。這種設(shè)備使用鍵控連續(xù)波發(fā)送數(shù)字信號的發(fā)射器給接收者的信息位于車輛中。數(shù)據(jù)是通過控制爆發(fā)的寬度。

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
設(shè)計者感興趣的是門控脈沖的形狀包絡(luò)和頻率石英晶體振蕩器的變化鍵控。的形狀包絡(luò)影響雜散信號的內(nèi)容。同樣的，頻率或相位調(diào)制造成的承運(yùn)人的門控振蕩器會影響信號純度。這些中的任何一個影響可能導(dǎo)致帶外信號分量和未能滿足的可能性排放認(rèn)證要求。

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.
在圖1中，前緣傳輸?shù)牟ㄐ问窃谕ǖ?中捕獲，顯示為頂部軌跡。石英晶振 跟蹤A包含極值數(shù)學(xué)函數(shù) 稱為roof，它提取每個周期的峰值傳輸信號。這個痕跡是用于評估的上升時間爆裂。上升時間參數(shù)出現(xiàn)在第一個參數(shù)讀數(shù)的行位于正下方顯示的痕跡。

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.
跡線B，從上面數(shù)第三個，包含抖動軌跡頻率和的函數(shù) 顯示了中的變化頻率是時間的函數(shù)。請注意頻率收斂到標(biāo)稱值315大約250納秒。這底部軌跡包含周期到周期的抖動跟蹤周期變化。這兩個功能允許用戶指定振幅閾值和滯后水平。這允許用戶啟動測量僅在信號已經(jīng)達(dá)到合理水平。閾值水平顯示為水平虛線來源行波形(CH2)。請注意抖動跟蹤功能不啟動直到閾值水平被已實現(xiàn)。這避免了錯誤由讀取噪音引起波形的開始。

貼片石英晶振	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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