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.
Re: Mixer conversion loss
If I can add:
Another importent parameter is the Isolation of the mixer. Now you can play with the diode Vb or can use two or more in series or parallel. This way you can optimize for the best C.L and isolation.
Improve the matching at IF and FR ports in order to get...
There are max current as appears in the design rules of the technology you work with. For example 3 µ thickness gold on MMIC can hold about 10mA per 1 µ line width.
This is correct. SRD can go up to 20GHz. For PLDRO using the SPD that includes the SRD. Last years there are several papers show good results using FET transistor.
gecky,
Why do you have a feedback, didn't yoay want the DR for a feedback ?
If the oscillator is a series feedback (DR is located in the gate or base) then S11 at the gate(base) should give negative resistance and it is ligal and correct. For correct design it shouldn't oscillate without the...
Re: Designing an oscillator
What applications?
For best phase noise SiGe HBT might be the best. If you can't find take a BJT.
Use 681 of Nec for a start point.
Re: help! the "error" in 2 ports transmission meas
rinjic,
As you said the peaks come from resonances of the ring. If the peaks move it means the resonance frequency is moved. I suppose the exact resonance frequency is a function of the material and its dimensions and also the edges condition...
Re: impedance matching
If you have a nonlinear model for the device you can find Zopt first and then match from load (50 ohm) to Zopt, the device wiuld like to see.
If you don't have a nonlinear model use Krips method: Calculate Ropt by devidind Vmax-1 (about) by the max current. Then calculate...
Re: impedance matching
If I understand you correctly the load should be as Zopt, the load for max power. It can be found using a load pull test. Usually the load is LC,(LPF as mentioned).
Re: X-band VCO
Generaly speaking if the varactor is located at the E (or S), you can get wide tuning range.
If you got only 5MHz it means the varactor location is wrong or the varactor value. If you locate the varactor around low impedance then you short it. Also if the varactor has high...
There are several parameters to full fill for a filter design. For example fpr 1 section you can use an open stub lamda/4 length for band stop filter at the desired frequency.
S11 can be tested in saturation. For S22 (input signal saturates he device)you have to saturate in input with a different frequency signal you use for s22.
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.
