Obviously I could use smaller pullup/pulldown resistors but this will only improve by one order of magnitude before < 1k resistors start burning too much power. Looking closer however the rise time is nearly 40usĪs was mentioned previously, this is due to the gate charge having to dissipate through a 10k resistor. Q1 no longer blows up and a reasonable square wave is produced: I implemented the suggestion of adding resistors to each drain individually like so: I think this means I am shorting +12V to -12V for ~30ns through the FET which is enough to make it go up in smoke.Īny suggestions on how to improve the design to avoid this problem? Looking at the DMG6601LVT datasheet I can see that the Turn-Off Delay Time for the NFET is 31.2ns while the Turn-On Delay Time for the PFET is only 1.7ns. I believe this is because I tied the drains of the NFET and PFET together. With 7-digit resolution and 10 ppm accuracy for sine waves, the 195 is ideal for multi-channel applications requiring standard functions. Some of the other standard functions include DC, positive ramp, negative ramp, pulse, pulse train, sin (x)/x, cosine, haversine and havercosine waveforms. I built the circuit, plugged it in and Q1 promptly blew up. The 195 provides sine and square waves up to 16 MHz. PILOT_CTL is the 0-3.3V square wave and the end of R6 should be the +/-12V output. The design requirement is to generate a +/-12V square wave from a 0-3.3V square wave at 1kHz. Description: control Independent Pulse Width and Rate The WaveTek 166 fills your requirement for a truly versatile laboratory instrument.
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