Tektronix 071-0590-00 user manual Data Patterns, Data Output True and Complement

Specifications

Data Patterns
Format	NRZ-L, Normal and Complement
Type	PRBS or WORD (User-programmable)
PRBS Patterns	2n-1; 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 GB1400 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 GB1400 are tabulated here.

Pattern	Feedback	Taps
PN7	6	7
PN15	14	15
PN17	14	17
PN20	17	20
PN23	18	23

Data Output (True and Complement)

Amplitude	Variable 0.5V to 2.0V, 50 mV steps
Baseline Offset	Variable -2.0V to +1.0V, 50 mV steps
	-2.0V to +1.8V, 50 mV steps, with PECL option
Pulse Top Limit	+2.0V into 50 Ohms, +4.0V open load
	+2.8V into 50 Ohms (with PECL option)
Rise/Fall Time	150 pS, typical (20-80%) at 1V 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