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067-0681-01: Difference between revisions
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* I_R7 (tunnel diode off, input waveform high) = 70mV/(43+50) = 0.75mA. | * I_R7 (tunnel diode off, input waveform high) = 70mV/(43+50) = 0.75mA. | ||
So the tunnel diode gets 11.2mA - 0.75mA = 10.45mA. This enough to switch | So the tunnel diode gets 11.2mA - 0.75mA = 10.45mA. | ||
the tunnel diode, even near the high end of its peak current tolerance range. | This is enough to switch the tunnel diode, | ||
After the tunnel diode switches to the high voltage state, more current (about 4mA) is diverted | even near the high end of its peak current tolerance range. | ||
After the tunnel diode switches to the high voltage state, | |||
more current (about 4mA) is diverted | |||
into the load instead of the tunnel diode. | into the load instead of the tunnel diode. | ||
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* r_d = 0.025V / 0.006 = 4.2 ohms | * r_d = 0.025V / 0.006 = 4.2 ohms | ||
The ringing current of a parasitic L-C resonator dissipating into the tunnel diode's dynamic resistance | The ringing current of a parasitic L-C resonator dissipating into | ||
could result in significant time-domain voltage wiggles which would be difficult to distinguish from transient response | the tunnel diode's dynamic resistance could result in significant | ||
time-domain voltage wiggles which would be difficult to distinguish | |||
from transient response problems | |||
in the vertical amplifier of the oscilloscope under test. | |||
* [http://w140.com/tek_067-0681-01.pdf Tektronix 067-0681-01 Datasheet (PDF)] | * [http://w140.com/tek_067-0681-01.pdf Tektronix 067-0681-01 Datasheet (PDF)] | ||