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Yes, that is exactly correct. The reflected signal will go back into the mixer and can create other spurious products. The 3 dB pad actually attenuates signals in the stopband by 6 dB since they go through the pad twice, once in the forward direction, once as a reflection. Usually this is...
An RF filter works by reflecting signals outside of the passband, and this reflection is caused by an impedance mismatch. So in the passband the filter's impedance is 50 ohm and the signal does not see an impedance mismatch and goes through with just a little attenuation. In the stopband...
Yes you can put the LPF between the signal source and the mixer. The pad should go between the mixer and the LPF.
Generally, you will see better performance if your put a pad between a mixer and filter. Spec sheets for mixers and filters always assume a broadband 50 ohm match, and if your...
A good rule of thumb is to try to have the bias line impedance 10x the characteristic impedance.
So if your system is 50 ohm, try to design the bias line to have at least 500 ohm impedance at your signal frequency.
If your inductor is below SRF, then you can use this equation for impedance:
Z...
For this power and switching speed you'll need a pin diode switch. I would contact the two companies below, neither one has a standard product that meets all your specs, but they both do high power pin diode switches and they both do lots of custom orders.
**broken link removed**...
In general, Noise Figure degrades the signal to noise ratio. So a component could have an increasing noise figure by either increasing the noise level or by decreasing the signal (if noise level remains constant).
For instance a passive 10 dB pad has a 10 dB noise figure, but it does not...
The LO leakage at the IF port can be easily filtered since the IF is 10 kHz and the LO is 70 MHz. You could build a low pass filter, or companies such as Mini-Circuits sell small connectorized or surface mount low pass filters. The attached is one that should work well for you. For best...
The important thing to remember about cascading filters is that the S-parameter data you get from the manufacturer is taken with a very good 50 ohm load on input and output. Outside the passband, your BPF will not look like 50 ohms, so you may not get as much attenuation as you expect from the...
IEEE 802.11 a/b/g etc. are generally considered to be the WiFi "specs". However, these specs are MAC layer specs primarily, they have very little detail about physical layer. Years ago it was found that companies could be compliant with IEEE 802.11 specs but still build devices that were not...
The rule of thumb is that OIP3 = P1dB + 10 dB.
You have S21 of 9.9 dB. So your OIP3= -8.1 dBm which is about 8 dB higher than your P1dB, which is not too far off.
Typically for mixers, especially double balanced ones such as this, the manufacturer does not specify overlapping R and I frequencies. In that case it's clear that for an upconverter I is input and R is output. For a downconverter R is input and I is output. For this mixer the ranges almost...
A capacitor will always block DC - even above it's resonant frequency. However above it's resonant frequency it's impedance won't behave like a capacitor. Instead of decreasing with higher frequency it will increase (it will behave like a DC blocking inductor). You'll want the impedance to be...
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