Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
yep, length does no change the impedance.
check the `frequency pulling` plot of the VCO to see what happens when the output load is not matched, it will give some idea.
put that same line structure to another location on your PCB that you can connect two sma connectors to it, then use VNA to measure the line itself (+2 connectors and the launch of those connectors).
In the past I have used some non critical parts from far east vendors, like upto 6 GHz. they did the trick. but as BigBoss mentioned at higher frequencies they are not as good compared to US/EU products. Far east vendors may have performance issues at microwave for now, but they are also...
you probably checked hmc951, it has lo and rf amps inside.
and hmc833 or max2870 for pll+vco maybe.
never seen one with build in opamps, you may need to use another opamp or IFDVGA for that.
psemi has PLLs that you do not have to further program.
You install pull up or pull down resistors to each control bits and than it will lock to a constant frequency. you can use some DIP switches for different frequencies.
if we consider the whole frequency generation loop, PN depends on many factors such as ref clk you use, your loop filter BW, your VCO and PLL.
If you check the datasheet of HMC764LP6CE, the part biff44 suggested, its PN at 100k offset is around 120dBc/Hz. You can improve it with a better...
no two thing can be the same in universe =)
, thus as BigBoss said, there will be some minor differences due to mfg process.
Some vendors provide distribution for these variance. they test many parts and put gain, p1db, etc. part to part and/or lot to lot distribution plots.
try to use parts...
You can easily obtain 70-80dB cancellation by injecting DC offset to IF ports of mixer but, it will get harder to obtain that levels of suppression if you have a variable LO frequency, wide temp range, etc.
decide a fix LO like 14 GHz, Sweep RF from 14-1 8GHz with SG, measure power level on SA from DC to 4 GHz. This will give you infi about mixer If performance upto 4 GHz for 14 GHz LO and low side LO injection.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
