FOA3251B1 Datasheet, PDF (10/25 Pages) Infineon Technologies AG – High Speed Clock and Data Recovery for Fiber Optic Applications

V_pfd
K_d2π
FOA3251B1
S1028C1
Functional Description
-4π
-2π
2π
4π ^Ïe
-K_d2π
ITD11418
Figure 3 PFD Characteristic
The VCO is a LC type with a center frequency of 2.5 GHz. The measured tuning range
is shown in Figure 4.
3
GHz
2.8
ITD11419
2.6
m25 Center Freq. [GHz]
2.4
20 Center Freq. [GHz]
85 Center Freq. [GHz]
2.2
2
0
-1
Figure 4 Tuning Range LC VCO
-2
Tuning Voltage
V -3
The delay line is programmable in 8 steps of about 50 ps. The clock signal is adjustable
over 1 period (400 as) and can be easily adapted to different applications.
Data Sheet
10
V1.0, 1999-08