Mar 15, 2018 #1 B bandw Newbie level 2 Joined Mar 15, 2018 Messages 2 Helped 0 Reputation 0 Reaction score 0 Trophy points 1 Activity points 15 i am trying to design a 2 x subharmonic upconvertor mixer. LO=-15dbm @ 32.5 ghz RF= -30dbm @ 25 ghz IF = 40 Ghz i am not getting any gain...? why ? also i have the problem of RF feed through.. i understand it would feed through due to single balanced nature of the toplogy , but its higher power than the required IF. lower stage is LO and upper is RF/mixer... all the ports are properly matched Attachments 2.png 41.8 KB · Views: 109 1.png 15.6 KB · Views: 106 3.png 26.7 KB · Views: 109
i am trying to design a 2 x subharmonic upconvertor mixer. LO=-15dbm @ 32.5 ghz RF= -30dbm @ 25 ghz IF = 40 Ghz i am not getting any gain...? why ? also i have the problem of RF feed through.. i understand it would feed through due to single balanced nature of the toplogy , but its higher power than the required IF. lower stage is LO and upper is RF/mixer... all the ports are properly matched
Mar 16, 2018 #2 D.A.(Tony)Stewart Advanced Member level 7 Joined Sep 26, 2007 Messages 9,001 Helped 1,823 Reputation 3,645 Reaction score 2,196 Trophy points 1,413 Location Richmond Hill, ON, Canada Activity points 59,535 How did you arrive at the optimum DC bias for frequency doubling of 32.5GHz? That looks like too high Vdc.
How did you arrive at the optimum DC bias for frequency doubling of 32.5GHz? That looks like too high Vdc.
Mar 18, 2018 #3 B bandw Newbie level 2 Joined Mar 15, 2018 Messages 2 Helped 0 Reputation 0 Reaction score 0 Trophy points 1 Activity points 15 do you mean V_be or V_ce ? My device has a diode voltage of 900mV.. and VCE breakdown of 1.5 Just wanted to add.. after reading some literature i came to know.. i need to bias the lower half in Class B operation. can you please tell me what should be the base potential and the collector potential for that. ? assuming the same current.
do you mean V_be or V_ce ? My device has a diode voltage of 900mV.. and VCE breakdown of 1.5 Just wanted to add.. after reading some literature i came to know.. i need to bias the lower half in Class B operation. can you please tell me what should be the base potential and the collector potential for that. ? assuming the same current.