J240 single-channel compact pulse generator
- User-adjustable amplitude from 0 to 700 millivolts
- Generates fast complementary outputs
- Available with rectangular or Gaussian output pulses
- Risetime/falltime 60 picoseconds, typical
- Adjustable trigger threshold, output amplitude, and output width
- Operates from standard 12-volt "wall wart" power supply
- Compact extruded anodized aluminum enclosure is supplied with mounting flange
- Ideal source for time-domain device model extraction
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The J240 is an externally-triggered pulse generator with complementary outputs and adjustable trigger levels.
The J240-1 version outputs 130 picosecond FWHM complementary Gaussian pulses at the rising edge of the trigger input. A trimpot adjusts the amplitude from zero to 700 mV peak. AC-coupled outputs.
The J240-2 driver output follows the input and the WIDTH pot is inoperative. AC-coupled outputs.
The J240-3 is a DC-coupled signal follower which provides LVPECL outputs when its outputs are terminated with 50 ohms to ground.
| FUNCTION | Externally-triggered complementary-output pulse generator |
| TRIGGER | Rising-edge trigger, 50Ω input impedance Threshold is user adjustable from -4 to +4 volts Threshold test point is provided |
| PROPAGATION DELAY | 800 ps, nominal |
| OUTPUT | User adjustable 0 to ±700 millivolts, peak (50Ω load) Nominal 5Ω output impedance J240-1 and -2 are AC coupled J240-3 is DC coupled LVPECL |
| BANDWIDTH | DC to 1 GHz repetition rate |
| RISETIME | 60 ps (20% to 80%) |
| FALLTIME | 60 ps (20% to 80%) |
| PULSEWIDTH | 130 ps FWHM, nominal (J240-1) |
| JITTER | < 1 ps RMS |
| OPERATING TEMPERATURE | 0 to 60°C; extended MIL/COTS ranges available |
| CALIBRATION INTERVAL | One year |
| POWER | +12 volts at 150 mA, max |
| CONNECTORS | Gold plated SMA input and output jacks standard; SMB and LEMO optional Threshold level test point 2.1 mm X 5.5 mm barrel power connector |
| INDICATOR | LED: green power |
| PACKAGING | 3.3" (L) x 2.1" (W) x 0.9" (H) extruded anodized aluminum enclosure |
J240-1: single-channel compact pulse generator with 130 ps nominal Gaussian pulse outputs and rising-edge trigger
J240-2: single-channel compact pulse generator/input follower with 60 ps nominal 20:80 rise/fall time
J240-3: single-channel compact pulse generator/input follower with 60 ps nominal 20:80 rise/fall time LVPECL