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Re: Multi element matching using Smith chart
Thanks for useful suggestions FvM and vfone. Two element matching is very straightforward using Smith charts. For multi-element matching, one needs to use the numerical method similar to any filter design.
You have mentioned RF simulator for for...
Multi element matching using Smith chart
Hi
Multi element matching is needed for separating optimizing the Q and bandwidth of the circuit. For multi element matching(>3) components, how does one go about this using Smith charts? As for multi element there are an infinite paths to reach the...
Hi FvM,
So the capacitor is realized using coaxial lines. There is no physical SMD like capacitor. Is there a reference where such a coaxial transmission line design is carried out which I can refer?
Thanks
Hi,
The DC block connector available from various manufacturers such as https://weinschel.apitech.com/weinschel/pdfiles/wmod7006-1.pdf support a particular frequency range. My question is why can't a capacitor with appropriate matching can be used instead of these DC block connectors?
How are...
The first diagram which you are saying as double differential pair is slightly non-linear compared to the second one. The first one uses transistor as common mode detector and the common mode current is detected. In the second one, since only resistors are used to detect the common mode it might...
Hi,
TEM propagation mode which usually happens in almost all two plate conductors, can be represented equivalently by the famous LC ladder network.
For TE/TM modes, is there an equivalent circuit representation?
Thanks
X[k] = \[\sum_{n = 0}^\N-1\]x[n]\[{e }^{-j*2*pi*k*n/N }\], k=0 to N-1. From this definition, if you evaluate the exponential for n>N/2 the frequencies will come out to be positive. And vice-versa for n<N/2. The upper half of the unit circle is +ve freq. and the bottom half represents -ve freq.
It depends on the DIVIDER, PFD, LO driver circuitry. If they are differential use both, gives advantage for common mode rejection. But if they are single ended, just use one of them.
Calibre for VCO core circuitry. For Inductor, I assume you have used a 3D simulator as I mentioned in my previous post. You need to check the effect of BW on phase noise to conclude its source.
Are your simulations settings accurate? How did you extract inductor? Are you using any electromagnetic simulator(Sonnet, EMX etc.) for your inductor model? 20 dB is a huge difference.
You have a type 2 system. With one integrator from charge pump and the other from VCO. You need to add a zero. Place a resistor in series with capacitor after the charge pump. The zero location should be within the unity gain bandwidth of your open loop response.
The swings are expected if the VCO is operated in the voltage limited regime. To protect the VCO from breakdown, sometimes reverse bias diodes are used to protect the device from these stress conditions.
Hi,
The linearity is determined in general by the last stage in the signal chain. If the last stage is compressing, the THD will worse. This is for voltage outputs, i.e. Opamps.
The other linearity which you are talking is about handling as large input swing as possible. With large input...
Dear All,
While designing opamps, one deals with phase margin for stability. But when designing LNAs, Rollet stability factor is checked. I am sure these two are related but for some reason Rollet stability factor is more appropriate for LNAs.
1) Can someone shed some light on the relation...
Re: finding overall transconductance of OTA
Do a DC sweep by varying Vin and monitoring Iout. Than take dIout/dVin.
Doing AC sim will only give small signal gm around your operating point.
Hi All,
In the attached frequency locked loop, why is there a need of compensation network formed by Rz,Cz, and Cc? As far as I see there is only one integrator in the closed loop, the OTA. The oscillator from vctrl to output frequency is just a gain block since the output variable of interest...
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