HSPICE 傅立葉分析法[19]

Varactor Capacitance (pF) 1.5V

1.0V 0.5V small dc

Fourier analysis method

圖 B-12 HSPICE 傅立葉分析法預估之大訊號等效電容電壓曲線

附錄 C

Absolute Pull Range

Absolute Pull Range（APR）是定義振盪器在中心振盪頻率左右，可以在表面聲波 共振腔或是石英共振腔，因為溫度飄移而使振盪頻率不在所要的中心頻率、因時間變化 而造成共振腔老化，以及主動電路的直流偏壓供給不穩造成變化，最後和接上使用電路 的阻抗也一併加入考慮，而定義出來的一項振盪器的參考指標。

關於 APR = (Pull range) - (degradations due to temperature+aging+power supply+load)

2. Degradations due to temperature:

請參考下方數據，舉例來說: 雖然+25 deg(常溫)時 turing range 是很對稱的(-45 ppm

~ 45 ppm)

但實際應用時要考慮所有的溫域。所以考慮所有溫域後(-30~85 degC)，

實際能調的範圍就會縮小到 -30 ppm~ +30 ppm 所以 Degradations due to temperature=

+/- 15ppm

3. Degradations due to aging:

VCSO/VCXO 的頻率會隨著使用時間改變，可能是 10 年內會在+/- 3ppm變動

4. Degradations due to power supply:

VCSO/VCXO 的頻率也許會隨著供應電壓改變，可能是 3.3+/-10%會在+/- 1ppm變動

5. Degradations due to load:

VCSO/VCXO 的頻率也許會隨著輸出的 load 改變，可能是 5pF~25 pF 會在+/- 2ppm 變動

所以最後 APR = (Pull range) - (degradations due to temperature + aging + power supply + load )

= (+/-45 ppm) - [(+/- 15ppm) + (+/- 3ppm) + (+/- 1ppm) + (+/- 1ppm)] = +/- 30 ppm

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簡 歷

姓 名： 康 乃 元

居 住 地： 桃 園 縣 龍 潭 鄉

出生日期： 民 國 七 十 二 年 四 月 十 三 日 學 經 歷：

中 央 大 學 電 機 工 程 學 系 (90 年 9 月~ 94 年 6 月) 交 通 大 學 電 信 工 程 學 系 碩 士 班 (94 年 9 月~ 96 年 7 月)