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HP 70845A pattern generator module for Modular Measurement System (MMS). Occupies 4/8 module slot and has seven I/O ports, six on the front panel and one on the rear. Operating Frequency Range: 50 Mbit/s to 1 Gbit/s. Patterns: PRBS Test Patterns: 2^23-1, polynomial D^23 + D^18 + 1 = 0, inverted; 2^15-1, polynomial D^15 + D^14 + 1 = 0, inverted; 2^10-1, polynomial D^10 + D^7 + 1 = 0, inverted & 2^7-1, polynomial D^7 + D^6 + 1 = 0, inverted. Zero Substitution/Variable Mark Density Test Patterns. Word Test Patterns. Alternating Word Test Patterns. Data Output Inhibit. Error Add. Data Polarity. Clock Input: Waveform: Sinewave from the HP 70322A or 70320A signal generators. Amplitude Range: ± 4 dBm. Return loss: Over operating frequency range: > 10 dB typical. Impedance: 50 ohm nominal. Interface: ac coupled. Connector: N-type female. Data and Data Outputs: Format: NRZ. Levels: Selectable amplitude and offset or nominal ECL, into 50 ohm to 0 V or 50 ohm to -2 V. Amplitude Range: 0.25 to 2 V p-p nominal. Amplitude Resolution: 10 mV nominal. ECL High level: -0.90 V, nominal. ECL Low level: -1.75 V nominal. Delay: Data delay variation vs clock output transitions: Range: ± 1 ns nominal, Resolution: 5 ps nominal. Jitter: Specified for 2^23-1 PRBS, 2 V p-p output amplitude, 0 V high level and measured relative to clock/32 trigger pulse. Clock and Clock Outputs: Amplitude: Range: 0.5 to 2 V p-p nominal, Resolution: 10 mV nominal. Transition Times: 10% to 90% at 25°C (typical). 1GHz, < 300 ps
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