I'll have to try and find some schematics for that. I had cause recently to design (read lash up) a pulse generator with variable symmetric rise and fall times; pretty easy really, a couple of adjustable constant current sources and a diff. pair as a current switch. What wasn't obvious was how to make the rise and fall times independently adjustable other than doubling up the former circuit and adding some switching diodes. I'll have to look and see if Tek had a cleaner solution.
Damped miller integrator? I built one of them a few years ago to get adjustable rise time. If you stuff a small cap across B-C junction with a (trimmer in my case) resistor in series with it. Doesn't affect bias yet slows the transistor down.
No. It's quicker to draw in LTSpice (and even simulate) than it would be to give a purely word description. Please excuse the crudeness of the model, I didn't have time to
paint bias it properly or create a decent output clamp. In a fully fledged version you'd use something a bit better than a pair of back to back diodes to guarantee something like a flat top.
There's two differential pairs acting as current switches. The top one switches the charging current, the bottom discharging. You set the current of the constant current sources I
rise and I
fall to control the rise and fall times.
The output:
That's the Tektronix version in rough outline. The version I used before didn't have the top differential pair, just a current source, and the current source off the tail of the bottom pair was twice the value of the top current (i.e. I
bottom = -2 * I
top). Switch on and you draw (I
top - 2*I
top) out of the capacitor, off and just the top current source supplies I
top.