Convert Low Voltage Buffer into High Voltage Buffer
I interviewed with the Tek chip/hybrid group in the darks ages, then ran into a few of them again after Maxim bought the business. They had an in-house design manual full of tricks. I don't know if it ever made it outside the company. Anyway, I recall one of the designers mentioning that they did some design where they took a low voltage buffer and turned it into a high voltage buffer by floating the power supply rails with the input signal, i.e. create a power supply window suitable for tracking the input.
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