Fast Open-Drain Comparator?

Fast comparator and a diode.

LT319A? dual and judging from the packages available it is old

-Lasse

I thought of that, but I'm tight on headroom... need a VOL~0.2V ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

I'll check it out, some of those oldies were quite good. ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

Is this one fast enuogh?

Fast comparator and a gold-doped RF transistor?

Yep. Looks good!

...Jim Thompson

Fast comparator and a 2N7002. Get rid of the base resistor.

You specified LTC, so I figured you were simulating. In sim, just use an ideal diode.

Sort of overkill for a 10mA load ;-) ...Jim Thompson

I was just shopping parts. Joerg pointed out a Microchip device that'll be perfect. ...Jim Thompson

Just happened to be looking for something else at Microchip and found the model

or go to here and browse around

Have not tried to plug it into any Spice engine

Monsoon kick in yet? Still a little early I suspect but I see Tucson got a pretty good drenching.

Thanks, Joe! We got heavy rain last night, and power out for about an hour... but I slept right thru it ;-)

The model... 200+ lines, tables, limits, all the crap that I chide about :-(

I'd guess I can write a model that matches that behavior... in about

After the job at hand I'll give that a try. ...Jim Thompson

And a big chunk of gate capacitance. ...Jim Thompson

VOL,MAX sucks.

I'm dealing only in low currents. ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

Just tack this on your favorite comparator:

That would do it ;-) ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at