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Actually and reactive load, transformer
or inductor, single ended or push pull.
On 6/9/2018 4:05 PM, Jerry Gaffke via Groups.Io wrote:
I'm learning here,
never knew that a push-pull configuration for MMIC's was a thing.
But plenty of google hits, figure 2 on page 4 here shows one:
Even configured for push-pull, there aren't many MMIC's that can
the nearly 1W of power needed to drive those IRF510 gates at
There are MMIC's that could deliver the 100mW needed to replace
when configured as a single.
I'm really curious how well that ADA4895-2 works for driving the
Still not sure about the 2v.
The MMIC's are designed for a specific operating voltage, if
designed for 4.0v and
you drop it to 2.0v, it won't draw any current from the supply and
My guess is that the 4.0v (4.5v absolute max) spec on the cheap
BGA616 MMIC is the "supply voltage",
used in calculating how many ohms for the dropping resistor from
your particular supply rail
to get the desired 60ma quiescent current into the MMIC. Signal
rides on top of that, so it's fair to
have instantaneous voltages in excess of 4.5v on the output pin of
On Sat, Jun 9, 2018 at 12:25 pm, Howard Fidel wrote:
When you use a transformer with the push pull configuration like
Q93, Q97. the collector sits quiescent at the supply voltage.
Then you add the + signal swing on to that to get the maximum
voltage the device sees. So with a +2 V supply, you can't go
lower then 0 volts, so you can't go higher then 2+2= 4 volts.
That leaves a 1/2 volt margin for derating the device.