284

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Tek284-front.jpg

The Tektronix 284 is a pulse generator. Its output modes include:

  • 70 ps risetime pulse, 200 mV, 50 kHz repetition rate, 1 μs pulse duration (5% duty cycle)
  • Sine wave, 1 GHz or 100 MHz, 100 mV
  • Square wave, 10 MHz, 1 MHz or 100 kHz, 10 mV, 100 mV, or 1 V

Only one mode can be used at a time. The pulse comes out one output connector. The sine wave and square wave come out another output connector. Both outputs are 50 Ω GR-874.

The 284 generates a 1 GHz sinewave using a 2N3478 RF NPN transistor-based oscillator.

The 284 generates the 70 ps risetime pulse using a 20 mA, 1.5 pF tunnel diode, D180, Tektronix part number 152-0329-00. D180 is mounted inside of a 50 Ω airline (rigid coaxial transmission line with only air between the center conductor and the shell). D180 is in series with the airline's center conductor. One end of the airline contains three resistors for biasing the tunnel diode and terminating the transmission line. The other end of the airline is the GR-874 pulse output connector. For each pulse (every 20 μs):

  • the biasing current is switched on, putting D180 close to its peak current
  • a capacitively coupled "tripper" applies a short current pulse to D180, causing it to switch to its high-voltage state
  • the biasing current is switched off, causing the tunnel diode to fall back to the low-voltage state

The tripper pulse is produced by a snap-off diode. Air gap capacitors couple the tripper pulse to the tunnel diode. These capacitors, C185 and C186, are drawn with dashed lines in the schematic because they are really just stray capacitances. One side of each capacitor is the unconnected center pin of the bulkhead-mount female SMB connectors in the side of the airline. The other side of the capacitor is the conductive tunnel diode mount in the core of the airline.

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