Hi Jerry,
On 12/19/18 7:04 PM, Jerry Hancock wrote:
> Thanks to all that replied, lots of good info which will take me months to
> sort through, especially the link to Jürg Kögel looks helpful as well as a
> note from Bert.
>
> Attila, Yes, more phase noise than long term though this is really
Hi,
matching in the sense of selecting 4 equal ones won't help much with BJTs.
Take them from the same tape, that's enough. Also, the transformer ratio
does not matter much. Once VBE = 0.7V, the transistors switch on. The
authors
write that thy use the BE junction as diodes, but that is not
Gerhard, would there be any advantage to matching the transistors? I have a
pretty accurate curve tracer.
thanks,
Jerry
> On Dec 19, 2018, at 10:36 AM, Gerhard Hoffmann wrote:
>
> I had once some leftover space on a home-etched test board and put
>
> one of these BJT mixers in a corner;
Thanks again. I have some MCL T1-6T transformers sitting here so maybe they
will work.
Regards,
Jerry
> On Dec 19, 2018, at 12:03 PM, Bruce Griffiths
> wrote:
>
> NIST used off the shelf RF transformers in their mixers based on diode
> connected (collector connected directly to base)
NIST used off the shelf RF transformers in their mixers based on diode
connected (collector connected directly to base) 2N. The transformer
impedance ratios (!:5 IIRC) are specified in the papers on the mixer
performance.
Suitable transformers are made by Minicircuits and others.
Bruce
Thanks to all that replied, lots of good info which will take me months to sort
through, especially the link to Jürg Kögel looks helpful as well as a note from
Bert.
Attila, Yes, more phase noise than long term though this is really an exercise
to get a better understanding of oscillators and
Hi
There have been several threads on the SYPD-1 and it’s cousin in a different
package the RPD-1. Both are designed targeted
as phase detectors rather than mixers. While you can never say “always” the
best performance generally is to drive both
RF ports hard from matched sources. Terminate
Hello,
I'm playing around with various methods of collecting data for oscillator
testing and would like to try the loose PLL which requires a phase detector
(PD). I'm testing an AD8302 but that has a flat spot around 176 to 180
degrees. One of the papers I read recommended the subject PD
