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參數(shù)資料
| 型號： | FS8107E |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Low Power Phase-Locked Loop IC |
| 中文描述： | 低功耗鎖相環(huán)集成電路 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 128K |
| 代理商： | FS8107E |
FS8107E
the wireless IC company
Page 8
June 2001
Phase/Frequency Detector (PFD)
The PFD compares an internal input frequency divider output signal,
f
V
, with an internal
reference frequency divider output signal,
f
R
, and generates an error signal, DO, which is
proportional to the phase error between
f
V
and
f
R
. The DO output is intended for use with a
passive filter as shown in Fig. 3.
The input/output waveforms for the PFD are shown in Fig. 4.
Fig. 3 – Passive low-pass filter circuit
Fig. 4 – PFD input/output waveforms
DO
to VCO
R1
R2
C
high-Z
high-Z
high-Z
f
R
f
V
DO
LD
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