I need to compare a signal to a constant voltage; the signal ranges from 0 to 30mV, and I require a response time of 50ns at 250µV difference. The signal is a triangle wave with a slew rate in the range of a few mV/µs.
When having a look at the comparators offered by TI, they start at an offset voltage of 750µV, with 10ns comparators starting at 3000µV.
When, however, looking at the list of opamps, those start at 1µV offset voltage, with 100MHz amplifiers starting at 100µV.
It's strongly encouraged to use comparators, not op-amps, for comparing signals, so the only option I'm seeing is to pre-amplify my signal with a precision, high-speed op-amp, then use a comparator. However, this sounds wrong. If this is possible, then why don't chip makers offer this as a monolithic solution?