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Hi,
i think could be better to use any Minicircuits' MAR series amplifier or any other gain block.
It depends primarily on your final application... what is the gain you need, the bandwidth, the noise figure.
Most of these MMIC (built by MACOM, HP/Agilent, Avago, Stanford, Minicircuits...and...
Hi Stephen,
maybe the 633 is unstable...this could be caused by poor supply decoupling (some 100nF capacitors from the two supply rails to ground mounted very close to the IC ) or any other reason that i don't know.
Can you see any high frequency signal superimposed to the output ?
On the...
Hi Stephen,
ok..i suggested the micro because for me the AD633 was quite expensive.
Anyway, if you can find it easily and for you is cheap, i can really suggest to have the 633 working, because i was very happy when used it.
As you see, the basic circuit is so simple that it cannot not to...
Of course you have to build the circuit as described by Analog Devices. Then you could stimulate the multiplier inputs with known voltages to see if at the output you get what you would expect.
For example, for the circuit drawn in fig. 11, assuming that X2, Y2 and Z are connected to ground...
Sure, it should perform as you said, getting 0.9V when driven with 3V for each input. On the contrary i could think the IC is broken. Had you tried to start with some simple tests, like connecting two pots, one to X input, the other to Y input, then looking what you get at the output for various...
mmm..did you used a LM331 or AD633? LM331 seems to be a V/F converter so i think it's useless.
On the contrary, AD633 is great and i used it for a programmable DC dummy load i made for testing power supplies. It was configured as you need, for calulating power, taking the input voltage and...
It is also the very simplest divider.
It has large bandwidth if compared to other kinds (gysel or rat race),
and the bandwidth can also be broaded inserting more
λ/4 sections.
In fact just one λ/4 section could make the impedance transformation,
but if the "jump" is big (e.g. in a 10 ports...
Me too had similar problems on a PLL synthesizer board,
and in my case were the piezolelectric behaviour of
some SMD capacitors. I really proved this phenomenon
desoldering the capacitors and fixing them on a small
piece of PCB then excitating it with a vibrating tip.
An oscilloscope connected...
ac voltage measurement without transformer
Hi,
look at this application note by National Semiconductors
www.nsc.com
It decribes an ultra-high isolation amplifier powered by
an ultrasound transducer (!).
The input side voltage is converted to frequency then
opto coupled to a frequency to...
coax transformer
Hi there,
i frequently used transmission line transformers (1 to 9 and 1 to 4) and i never had problems. Basic guidelines for design those devices can be found, as RayEngine said, on Motorola AN749 and Philips ECO6907, ECO7703, ECO7213. I have all of these, but not in...
Hi,
right, toroids have a LOWER leakage flux respect to
conventional transformers, but they still have.
I had problems with toroids and i solved them in two ways:
1) wrap the toroid with the same iron foil used to make the core,
a 5mm shield reduced (in my application) the LF interference
of...
Hi jack,
personally, i use this technique, i don't know if it is the right or the faster one, but it works!
You may design yor RF subcircuit with your preferred RF simulation program (i use serenade and mwoffice), once got the RF layout, you export it in dxf format to make
it importable by...
Hi,
could anybody explain me what this
software can do compared to
Serenade
Microwave office
Hfss
Ads
..in what is better/worser ...
Thanks in advance!
Bye
TomAss :smile:
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