Atec Tektronix-GB1400 User Manual
Page 2
Specifications
Data Patterns
Format
NRZ-L, Normal and Complement
Type
PRBS or WORD (User-programmable)
PRBS Patterns
2
°
"'; n=7,15,17,20,23
WORD Lengths
8 and 16-bit only,
1 Mbit memory (with optional memory)
PRBS Phase Tap Information
The Pseudo-Random data patterns used in the GB 1400 TX are generated by shift-register and
exclusive-OR feedback technique. The pattern is dependent on which feedback taps (shift register
outputs) are selected.
For example, PN7 is defined as a seven-stage shift register, which the output of stages 6 and 7 fed
back (through an exclusive-OR gate) to the beginning of the shift register. The feedback taps used
in the GB 1400 are tabulated here.
Data Output (True and Complement)
Amplitude
Variable 0.5V to 2.OV, 50 mV steps
Baseline Offset
Variable -2.OV to +1.OV, 50 mV steps
-2.OV to +1.8V, 50 mV steps, with PECL option
Pulse Top Limit
+2.OV into 50 Ohms, +4.OV open load
+2.8V into 50 Ohms (with PECL option)
Rise/Fall Time
150 pS, typical (20-80%) at 1 V amplitude
Source Impedance
50 Ohms
Output Timing
CLOCK/DATA edge-aligned (+/- 100 pS)
Jitter:
100 pS, peak-to-peak Max. referenced to EXT clock
Connectors
SMA
Data Inhibit
Rear panel SMA, ECL (50 Ohms to -2V term)
Data Inhibit Rate
Asynchronous, 1 bit and 500 pS minimum width
Data Invert
Front Panel Selectable
A-2
GB1400 User Manual
Pattern
Feedback
Taps
PN7
6
7
PN15
14
15
PN17
14
17
PN20
17
20
PN23
18
23