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Feb8-12, 11:36 AM
P: 617
The ckt is a trivial NPN switching ckt (attached).

Breadboard does limit the frequency. But, I observed similar behavior in simulation and bread board. Waveform started to look slopy at 150KHz on breadboard, in sim same behavior at 300KHz.
Sometime ago, I was able to get 4MHz on breadboard. I think 200KHz is far too low. You can sqeeze more if you careful with bypass caps.
Attached Files
File Type: pdf BJT slow.pdf (6.2 KB, 7 views)