[ARC5] More on the Pullen Mixer circuit

[Dennis Monticelli]

FYI.  When the IC era began in the early 60's emitter coupled circuits were
among the first because it was a natural fit for the early semiconductor
processes and the circuit was quite versatile (amps, logic, mixers, log
amps, etc).  Without giving credit to Pullen his mixer circuit and
derivatives of it were employed.  I designed such circuits myself, never
knowing that Pullen had pioneered the vacuum tube version.  The basic
circuit then evolved into balanced and double balanced successors operating
on different though related mixing principles.

Now I know the true origin of the circuit.

Dennis AE6C

On Tue, Jan 3, 2017 at 4:57 PM, Kenneth G. Gordon <kgordon2006 at frontier.com>
wrote:

> On 3 Jan 2017 at 23:47, Ron Barlow wrote:
>
> > FWIW, I have constructed 2 different down converters that do not have an
> RF
> > stage preceding the Pullen mixer. They work fine. This design has a low
> noise
> > figure, and the lack of an RF stage is not a liability, at least up
> thru 30m, which is
> > the highest freq that I have experimented with, using the Pullen. I did
> use a
> > double tuned input circuit, to eliminate any potential image problems,
> but that may
> > not have been necessary, considering the relatively high IF freq that I
> was using.
> >  I only needed a total of 3 triodes, in these converters, as the LO is
> xtal
> > controlled, so "pulling" is not an issue.
> >    73 de ron
>
> Thank you, Ron. That is very helpful and I am very glad to know this.
>
> vy 73,
>
> Ken W7EKB
>
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