Hi All,
I'm designing a SP8T Switch for a switch filter bank. There are 3 TTL lines (A2 A1 A0) from the decoder.
In oder to put both switches on the same side, I need a circuit to make the A2 TTL line to behave in reverse. If High-Level Input Voltage (Vh>2.0 V) the circuit will put out <.8V or...
It works!
My tripler works! I used Wenzel method using a Metellic bridge quad diodes to convert sinewave to squarewave.
Inject 300MHz signal to input port, I've got 900MHz signal output @20dB loss with 56dB fundamental suppression, second harmonic is way down at noise floor.
The conversion...
I'm glad that you use my method.
Using silver plated aluminum to filter resonators, trnasmission line was downplayed by Bob Wenzel, a filter guru, but we had proven it worked well.
Some of our filters/ multiplexers (penta, quadra, tri, and diplexers) are functioning up there in at least 8...
Thanks, Biff44
I checked on Wenzel's papers, and found one of his article on RF magazine is very interesting. From a mixer doubler topology, where a bridge quad is used, he rotates the quad to move the common cathode (from the output) to the next arm connection. Voila! he transforms an...
I've designed frequency doubler (.005-3GHz & 1-11GHZ) using bridge quad diode using core and wire for the lower freq & microstrip for the higher frequency band.
I need help on designing low frequency tripler with input from 50-150MHz & 240 -375MHz, +10dBm power input & +15Vdc.
I'd like to know...
No,
I don't have DC power out or in.
The I-Q mixer is a combination of a power divider & a quadrature 90 degree hybrid & two mixers (all are lumped elements)
Thanks, krytar
Hi,
Use silver plated aLuminnum for both housing & resonators. The cheapest way to manufacture the diplexer is to cast both housing & resonators in one piece.
Follow this spec to silver plate your aluminum housing:
Electroless Nickel per AMS 2405B (200-250 micro-inch), then Copper per...
Hi,
Lower your RF power will help to lower the spur level. Put a 10dB pad between RF source & your mixer.
Usually, the mixer need very little power from RF to activate the mixing process. LO is the main drive to turn the mixer on. Some mixers can turn on with RF at -20dBm, but most of the...
Hi,
Hipass-Lowpass approach is used when you have a very broadband or steep rejection on both skirts of the filter.
For the spec that is given, your approach is correct. If you use a bandpass design, then the ratio between L&C in series will be very hard to realize (e.g. 1pf/1000nH).
Use...
Hi,
I need help to design a tranformer to match my 50 Ohm output from a I-Q mixer to a load impedance of 4,000 Ohm.
The conversion loss from my mixer is about 10.0 dB max (50 Ohm). Rf power is 0 dBm. LO is about +10 dBm.
From my calculation the voltage output at I & Q output is about 70 mV...
