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Hello
they used this resistor to provide a wideband matching for both RF and LO.
it is correct , but it is not necessary but u can use them as long as ur designing wideband circuit ,
4 sure this resistor will contribute to the NF , coz it will attenuate ur RF signal.
yes u can add the 50...
ur GND path is not connect ,
so expect very strange S parameters !!!!!
u can simulate it on any EM tool ,
I have simulated GSG PADS with momentum and t gave very nice results
Khouly
BJT(at)HBT up-conversion mixer design
hello
at 60 GHz u can use TL or passive elements , if ur process supports MiM caps , and spiral inductors u can use them as well
yes it is better to have ft 3 times greater the ur operating frequency
khouly
BJT(at)HBT up-conversion mixer design
1st u need to bias the HBT in the Peak FT current.
design the input matching network
Select ur load of the mixer
khouly
if u will use a single chip solution on board , direct conversion receiver will be suitable one
for complete direcrete realization , the most suitable is super-heterodyne receiver is the best
khouly
with this design , u will get a phased array with constant direction , coz u have a constant phase shift due to the hybrid couplers
sure u can simulate it with HFSS or any EM simulation tool , coz u have only microwave components
but u will not be able to change the direction of the beam...
simpy the discrete schottky diode is available for board level designes
but the monolithicaly intergrated circuits
both adressing different design tasks and differnt products
khouly
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