I will try the single transistor setup again and see if it appears to still work.
Did I somehow burn it up between single transistor and totem pole driver circuit? I was always very careful to make sure that all the pins where stuck in antistatic foam or all connected to ground until I plugged it right into my circuit. Using a single transistor I had the mosfet sending 12v to a motor and I noticed no change in temperature of the mosfet. If I replace the mosfet with an led, the led turns fully off and on as expected, which leads me to believe the problem is with my mosfet. Grounding the enable line makes no difference. Right now I am just using 5v all around since i'm testing with an led, and the problem is that when I send 5v to the enable line, my led lights up nice and bright, but when I remove power from the enable line, instead of the led turning off, it just dims to about half brightness. These devices can be used in a wide variety of. I am using the circuit show in the first post here: High-speed analog output photocouplers (optocouplers) are optically coupled isolators containing a gallium aluminum arsenide (GaAlAs) LED on the light emitting diode (input side) and a PIN photodiode and high-speed amplifier transistor on the output side in a single chip. I HAVE had it working using a single transistor to fully saturate the mosfet. At this output power it consumes a DC power of 12.3 mW and yields a PAE of 16.1%.I am trying to build a simple totem pole driver using transistors. As verification a broadband driver design using a class-AB TP stage is presented, which has a 3 dB bandwidth of 7.9 GHz and delivers up to +4.3 dBm into a 50 Ω load, which is 17 dB higher than its CC counterpart. Furthermore, a concept is proposed, where the TP stage can act as a broadband matched driver for differential or balun operation ranging down to DC. This is approximately 11 dB higher than for a conventional CC driver. Figure 1b shows the current path through the. The output Y is taken from the top of Q3. A combiner chip in 0.25 μm SiGe Bipolar CMOS (BiCMOS) verifying this concept in hardware as output driver is demonstrated proofing the increased achievable output power, which was measured greater than +0.1 dBm. Note that transistor Q4 is stacked on top of Q3 like a totem-pole. It is shown, that for matched drivers, in contrast to the widely applied common collector (CC) stage, class-AB TP stages offer higher output power and much higher power-added efficiencies (PAE) at comparable bandwidth. This paper presents an analysis of totem-pole (TP) stages for driver applications and summarizes the major design constraints for an optimization with respect to P1dB, OIP3, and bandwidth.
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