The HP / Agilent 8082A is a fast pulse generator with all pulse parameters variable.  With repetition rates to 250 MHz, transition times down to 1 ns, and amplitudes to 5 V.

• < 1 ns variable transition times
• Ultra-clean 50 ohm source
• Switch-selectable ECL levels
• Dual ± 5 V outputs
• Output: maximum amplitude is 5 V from 50 ohms into 50 ohms.  Maximum output voltage is ± 5 V (amplitude + offset)