Tektronix 071-0590-00 user manual Reference Data Input

Specifications

Data Patterns
Format	NRZ-L
Type	PRBS or WORD (User-programmable)
PRSB Patterns	2n-1where n =7,15,17,20,23
WORD Length	8- and 16-bit only,
	1 Mbit with optional memory

PRBS Phase Tap Information

The Pseudo-Random data patterns used in the GB1400 RX 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

Reference Data Input
Format	NRZ-L true
Data Rate	1 Mb/s to 1400 Mb/s
Input Threshold	Variable, -1.5 V to +1.0 V, 50 mV steps
Input Level	0.5V to 1.5Vp-p
Impedance	50 Ohms
Termination Voltage	Selectable, Gnd, -2.0V or AC
Delay Range	0-3.90 ns, variable, in 100 pS steps
Connectors	SMA

A-6 GB1400 User Manual