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Crystal 和 crystal oscillator 有何不同？

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Winnie the Pooh

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Feb 5, 2002, 10:51:56 PM2/5/02
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請問 crystal 和 crystal oscillator 有何不同？


ㄣ......好吃

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Feb 6, 2002, 10:17:06 AM2/6/02
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※ 引述《"Winnie the Pooh" <win...@the.pooh>》之銘言：
: 請問 crystal 和 crystal oscillator 有何不同？

簡單的說法,內部差一個IC

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[m※ Origin: 臺大電機 Maxwell 站 ◆ From: sw97-23.adsl.seed.net.tw

FreeZ

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Feb 8, 2002, 1:28:28 AM2/8/02
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>※ 引述《"Winnie the Pooh" <win...@the.pooh>》之銘言：

> 請問 crystal 和 crystal oscillator 有何不同？

crystal 是石英; crystal oscillator 是石英振盪器.

在電子界講的「石英」, 大多是指「石英晶體」的這類
零件. 「石英晶體」是中華民國電子業、學界中的標準
稱呼, 但也有人叫它為「石英子」或「石英振子」.

「石英振盪器」是指裡面有「石英晶體」的「振盪器」.

有空如下網頁看看:
http://www.txc.com.tw/

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Free Tech (Win32Asm, Electronics..)
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Updated: January-27, 2002 / 00:39

1999ygj

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Feb 18, 2002, 8:02:17 PM2/18/02
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I do not agree with your answer.
Crystal: passive component, two pins, connect to the crystal. Output usually
are sine wave.
Crystal Oscillator: active components, inside has electronics converters and
frequency control and temperature compensation circuit. Usually more than 2
pins, other pins are Vcc and ground. Often output are either sine wave or
pulse or square wave.

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FreeZ

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Feb 19, 2002, 5:23:18 AM2/19/02
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> "1999ygj" <2002y...@spam.com> wrote:

> I do not agree with your answer.
> Crystal: passive component, two pins, connect to the crystal.
> Output usually are sine wave.

不對! 光是單一顆石英晶體, 若不配合其它的電路,
根本不可能會輸出可觀測的 sine wave ..

不然你用示波器量給我看.

通常石英晶體的地位, 在振盪電路中, 是屬於高 Q 值
的濾波器. 它大多用在回授迴路上, 用來濾出特定頻率
的訊號...

我們都知道, 把一個放大電路接上交流上的正回授時,
就有可能會引起振盪, 若這個正回授的主要元件是石英
晶體, 因為它只允許某頻率通過, 故此整個電路, 就會
變成振盪該頻率的裝置, 這就屬於石英振盪器.

> Crystal Oscillator: active components, inside has electronics
> converters and frequency control and temperature compensation
> circuit. Usually more than 2 pins, other pins are Vcc and ground.
> Often output are either sine wave or pulse or square wave.

你提的這個, 只是廠商作出來的某些型號元件之內部作業而己.

一個振盪器, 裡有沒有內含溫控電路, 與它是不是屬於 "
石英振盪器" , 並沒什麼關係.

你用 4069 內的一個反相器, 兩端並上一個石英晶體, 接兩
顆對地的小電容, 振盪起來了; 這不就是一個 "石英振盪器
" 了, 不是嗎?

有內含溫控電路, 是為了使該 "石英振盪器" 的輸出頻率更
穩定的. 因為溫度的變化, 影響到頻率; 在比較高度要求的
情況下, 就要考慮採用溫控型的石英振盪器.

1999ygj

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Feb 19, 2002, 7:52:08 PM2/19/02
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Yes, you are right.
Crystal is passive component. It does not resonate, except when its already
inside a tuning circuit with Vcc and load capacitors. Typical frequency
tolerance is around 30ppm. No discrimination of any overtone frequency.
Crystal Oscillator is commonly known as active device with compensation IC
circuitry. Typical frequency tolerance is around 5ppm. Also, this device
able to control base band frequency, 3rd overtone, 5th overtone, ... etc.
Sorry unable to enter Chinese in my computer.
Jerry Ferguson, Santa Clara, California

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