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參數(shù)資料
| 型號： | TRU050-TACGA17.920-8.960 |
| 廠商： | VECTRON INTERNATIONAL |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PHASE LOCKED LOOP, CDIP16 |
| 封裝： | HERMETIC SEALED, CERAMIC, DIP-16 |
| 文件頁數(shù)： | 3/17頁 |
| 文件大?。?/td> | 627K |
| 代理商： | TRU050-TACGA17.920-8.960 |
SPICE Model
π
Vectron International 166 Glover Avenue, Norwalk, CT 06856-5160 Tel: 1-88-VECTRON-1 e-mail: vectron@vectron.com
The first-order open loop gain has a constant phase shift of 90 degrees. However, other frequency poles are present
in the loop due to the op-amp's limited bandwidth and gain, the phase detector and the VCXO modulation bandwidth
(these poles are included in the SPICE model). The loop's bandwidth is approximately equal to the closed loop
bandwidth and can be used to assess the stability, lockin range and filtering characteristics of the loop. The loop
acts as a bandpass filter centered at the clock frequency, just as if a tank circuit were used to filter the input clock
or data stream.
However, the filter Q of the TRU-050 is much greater than that of a tank circuit and typically ranges from 1,000 to
20,000. The PLL tracks input phase jitter inside the loop bandwidth while jitter is attenuated outside the loop
bandwidth. Converting the SPICE model (figure 13) to a closed loop illustrates the jitter transfer function shown in
figure 15. In general, the PLL rapidly locks those signals with an initial frequency difference (relative to CLKIN) that
is within the loop's bandwidth. Lockin time is longer for lower bandwidth loops and may be degraded by jitter or by
poor input duty cycle.
Simulated Results
The SPICE model just described can be used to determine the component values necessary to produce a desired loop
filter bandwidth, its jitter transfer function and its open loop response for a given application. Alternatively, simulation
results can be obtained using Vectron's "TRU-050 Loop Filter Calculation" software. This software runs from DOS and
will also provide the user with loop filter component values R1, RF and CF (see figure 15) based on desired loop
filter bandwidth, data type, data density, damping factor and data frequency. For assistance with your specific
application, or to receive a copy of Vectron's "TRU-050 Loop Filter Calculation" software, please contact Vectron’s
Application Engineering staff.
Figure 13.
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| TRU050-TACGA47.457-23.7285 | PHASE LOCKED LOOP, CDIP16 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TRU050-TACGA-1M0000000 | 制造商:VECTRON 制造商全稱:Vectron International, Inc 功能描述:Complete VCXO based Phase-Locked Loop |
| TRU050-TACGA-65M0000000 | 制造商:VECTRON 制造商全稱:Vectron International, Inc 功能描述:Complete VCXO based Phase-Locked Loop |
| TRU050-TACGB-1M0000000 | 制造商:VECTRON 制造商全稱:Vectron International, Inc 功能描述:Complete VCXO based Phase-Locked Loop |
| TRU050-TACGB-65M0000000 | 制造商:VECTRON 制造商全稱:Vectron International, Inc 功能描述:Complete VCXO based Phase-Locked Loop |
| TRU050-TACHA | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SINGLE DROP IN QUARTZ STABILIZED PLL SOLUTUION |
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