The power stage must be discrete due to costs
I humbly, but strongly, disagree. Correct values are found by design. If circuit tolerances (beta, for example) are unacceptable, then the circuit needs to have some feedback. Maybe there also needs to be some thermal compensation. But good circuit design does not involve “trial and error”.Going by your specifications, this transistor amplifier is a cheap way and it does a couple of jobs. Class A. NPN transistor. Power supply 50V single-ended.
Your two signals are mixed through bias resistors. Correct values are found through trial and error.
Detailed requirements but yet little effort to achieve it.Thank you for your replies.You are all correct that I have missed out some important information, so to clarify:
- Three voltage rails in the design: 50V, 10V, 3.3V.
- The DC DAC level is amplified 3x by a rail-to-rail opamp taking it from 0..3.3V to 0..10V.
- The rail-to-rail differential amplifier superimposes the 1Vpp sinewave onto the amplified DAC level.
- The sinewave will only be activated when away from the rails so clipping does not occur. This will be handled by the microcontroller.
- The amplified DC level needs to go close to rails, but a diode drop away is okay.
- The sinewave frequency is: 500Hz to 2kHz.
- Single supply power stage: 50V to GND.
- The output from the power stage will be fed back to a microcontroller so that it can adjust the DAC and sinewave peak-peak to compensate for passive tolerances and power supply tolerances.
- The power stage must be discrete due to costs in high-voltage op-amps.
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