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18 Threads found on Microstrip Vco
I have seen a PPT presentation where Monte-Carlo simulation was used to evaluate tolerances impact on the design and choose better values for capacitors and resistors. I think it was ADS, but i googled for it and did not found it. Maybe the same method could be applied to microstrip element width/spacing.
What about second image (color photo)? Open-circuited stub with varactor at open end. If i put open-circuited impedance point on Smith chart and add series capacitor (varactor with some DC biasing), impedance would not be altered! 0.01pF or 1000pF, results are the same. So i wonder how it performs frequency tuning? Although there a little solder o
Hi! This must be a pretty basic question, but I couldn't find the answer yet. Can a microstrip line's width be larger than its length? I am currently designing some LPFs and this problem came up. Thank you for your answers! :)
Hello! I design narrowband microstrip vco based on s53mv's article ( ). Instead of BJT i use FET transistor, then phasing lines (calculated for other S-parameters), and resonator microstrip arranged as classical 1-element microstrip filter, not "comb" as in original article. To my surprise very nic
I had two s21 maximums when tried to optimize, and both phase is near zero and high gain. I cant understand where it comes from, because i altered only gate stub length. Maybe it matched gate to other frequency. Also i reduced microstrip resonator coupling to quaterwave, original is almost halfwave and gives ugly filter s21. Results look well in si
First of all the circuit presented will never oscillate without feedback capacitors, whatever the series inductor is made by microstrip or lumped. Just put the circuit in a simple simulator for confirmation. Even the circuit is considered a Negative Resistance vco, would need some feedback components. Second, the DC current bias of BFP420 (30mA) is
are you designing a microstrip oscillator, or an IC chip? The bigest problem in such things are the parasitic reactances related to the structure. you need some sort of active device (FET or PIN diode) to switch in/out each capacitor, and those devices also require a biasing scheme. All of these things lead to a total reactance vs. frequency tha
Hi Everyone. Happy Holidays. Just want to get some feedback regarding the board layout I made for a 7.9 GHz frequency synthesizer if I did it correctly. The board I am gonna use is a double-sided 1.6mm FR4 board which is why I decided to use microstrip transmission lines in my design. I attached 2 board layouts along with the schematic. One bo
I want to design vco at 13 GHz with BJT infineon BFP520 in microstrip technology(rogers). At the moment i'm stucked at 7 there any examples of similar design? Does anyone has some suggestions what i should do?
Hello everyone. I?m trying to design a cmos distributed differential vco for a project, which means 2 parallel microstrip lines for the drain load and another 2 microstrip lines for the gate line. For the inverter i?m using the ?delay variation by positive feedback? tuning technique, proposed by Behzad Razavi in his book ?Design of (...)
try to use microstrip resoantor , and a varactor with each other to make this oscillator but this will degrad the phase noise performance khouly
do u mean that with the varactor i connect a microstrip line to make it back as a capacitor khouly
I want a designed and tested example for a wideband and loww phase noise vco in microwave (better in 8- 10GHz) on microstrip with a discreat transistor. In most of books only a not implemented ones are reported. have you any reference for practical structures with tested results? I have searched the papers of IEEE, but only few of thems are.
u can simulate the microsrtip resonator in @DS , it has a good library of microstrips , and u can even simulate the resonator using momentum , and then import the results in circuit simulation
One more remark: indeed a good separation between the vco/prescaler and output is important. The swithching of the dividers inside the prescaler will produce a lot of unwanted products. First you should calculate a power balance: what is the output level of the vco, and what level you have to provide to the prescaler. Usually the prescalers can ac
Looking to the layout of an X band vco (tuning range 9.2GHz--9.5GHz) I have seen that the GaAs Fet was polarized in reverse mode. The +5Vdc power supply voltage was directly connected to the source terminal through a choke microstrip circuit. Along the Drain output line (rf output of vco) a 82ohm resistor was series connected ( It ac
Problem with microstrip resonators is that the overall Q is not very high, for the same space you could use a coaxial resonator and achieve lower phase noise. Whilst the high Q resonator will give you lower phase noise you really have to consider the matching from the resonator to the active device. ie resonator to the base of the transistor.
Even better (low-noise broadband) microstrip-based vco article you can find in Microwave Journal, Vol. 42, no. 6, 1999.