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Impedance Waveguide Cst

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Hello, I'm designing a low pass chebyshev filter using stepped impedance. I'm using the book 'Microstrip Filters for RF/Microwave Applications' as a reference. I have difficulty understanding how low and high impedances are defined. The book uses Z0L = 93 ohms and Z0C = 24 ohms. I could not find an explanation for these values, I searched
Hi, Disabled outputs are floating = high impedance. This means the voltage is not defined...and thus is what you see. Additionally high impedance nodes are prone to pick up any noise and induced voltage. This behaviour is quite expectable. So why don't you connect Y7 to GND and switch to this node ... then you have a valid, low impedance (...)
Im trying to understand the the benefits of Charge Pump with unity gain amplifier compared to the normal charge pump that is implemented using two current mirrors: 156494 we have few questions about this circuit: 1) how does the unity gain amplifier helps me get higher input impedance in order to have more constant
While combining some fabricated blocks I observed following behavior: Antenna module: Wideband antenna with 3GHz bandwidth, input impedance is 100 Ohm. Receiver module 1: FET based mixer receiver with some complex impedance. Receiver module 2: FET based mixer receiver with some complex impedance + matching structure to 100 Ohm. All (...)
Hi, There is an issue with the ADC converter of the uC that I’m using. It has a dead band from 0V to 0.15V I've never heard about a microcontroller ADC with this (big) problem. Why don't you tell us the exact part name and vendor, or post a link to the datasheet? Picture: are you able to read the part values? I am not. [QUO
The capacitor in feedback path offers infinite impedance at DC. That means you have Infinite Gain (Gain = - Zfb/Zin) at DC. In order to limit this DC gain you need a parallel resistor with capacitor. Otherwise The DC gain will be limited only by the leakage impedance of the circuit.
When I use 1M Ohms for the oscilloscope input during measurement, the clock signal looks oscillating. I think it is due to signal reflection and mismatch. However, when I simulate the circuit with 1M Ohms loading, the output signal is not oscillating... You are apparently simulating without realistic cable (e.g. 50 ohms transmission
Hi, I am having trouble understanding how a deboo amplifier works. I know how a Howland Negative impedance works, but I can't understand the effect of the capacitor. Also why is the buffer needed in the input of the circuit? And does a DC offset in the input signal cause the op-amp to saturate? Thanks for the help, I appreciate your response and
Hello everyone, I am currently designing two low noise amplifiers (which will respectively operate at ~20GHz and ~38GHz) with the same foundry process (D007iH from OMMIC). The transistors come as discrete chips (roughly 400x400x100 um) without via holes, the aim is to use inductive degeneration and connect the source pads to ground thanks to two
Hi, can it be the fault of the ground plane? (Which is on both layers, bottom and top) Many unexperienced people "fill" the spaces between traces and think this now is a GND layer. But it is not! From the electrical view, a GND layer needs to be a low impedance ... thus a GND layer should be solid, without any traces in this
Thank you for your feedback. Here are the S-parameters of the full-mode SIW (calculated at 50 ohms port impedance) using two different tapered widths. 156385 Next, S-parameters for the HMSIW 156386 My main problem is that when I simulated these two structures without the tapered microstrip fe
Hello Friends, I have recently came across a text of impedance transformation provided by a tapped capacitor arrangement. Its a rare and unique text explaining the working of tapped capacitor network in terms of conservation of power. figure 6.31a) is an untapped case when no tapped capacitor is used..fig 6.31b) uses a tapped capacitor networ
Hi, Could you please elaborate on that claim? You talk about R, an ohmic load. But an ohmic load has a constant relationship of V and I. But in your case it is not constant, it varies with time. You have measured V and I. You calculated V x I to get P. So please calculate V/I of your measured values. To me it seems the result
Nominal LVDS differential impedance is actually 100 ohms, but compromises are possible.
What is the best reflecting coating for a cassegrain reflector antennas? Was looking at this site to buy some but wondering if there are better coatings out there that make a difference?
I designed i yagi patch antenna with balun(ms-to-cps transition). When i try to simulate, i get this error. I guess it might be because of the sma connector placement but still couldn't figure out why."waveguide ports must be aligned with Cartesian coordinate planes for the transient solver"
I have plotted load pull contours in excel using real and imaginary axis with reflction coefficients.Want to know if i convert thE reflection coefficient would i be able to plot the contours.
Hi, I intend to plot B/ko and a/ko plots of this paper through simulation either in cst or HFSS. The plots are shown in figure 5 of the paper (link below). The link to implementation of this antenna in cst is below as well. I have come across alot of answers but none of them seem to give me the right plot and at this point, I am not sure which o
Hi, I intend to plot B/ko and a/ko plots of this paper through simulation either in cst or HFSS. The plots are shown in figure 5 of the paper (link below). The link to implementation of this antenna in cst is below as well. I have come across alot of answers but none of them seem to give me the right plot and at this point, I am not sure which o
Hi all, I am now designing a power amplifier (PA) at 2.4 GHz using microstrip lines as input and output matching networks on a Rogers 4350B substrate. This PA was designed using the harmonic termination technique. Simulation substrate parameters of this substrate are given in its datasheet. Input matching network (IMN) was treated to 2f0 while o