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43 Threads found on Flatness
Your tracking generator when normalized should be more like +/- 0.1 db over any reasonable bandwidth. That's the whole idea of it. It very slowly sweeps and automatically corrects the output level, which generates some kind of gain correction lookup table which it then applies during normal use. I suggest you study the operators manual for your
Those min/max params are your "box". What you do within that box, depends on what you want from the device - leakage, drive, linearity / flatness, loading and so on. The basic "how" is, you set the properties of the instance you place in whatever capture tool you are using. But I think maybe "what" and "why" are not understood either?
I'm missing a full specification - pulse duration - rise and fall time - pulse flatness/voltage accuracy - repetition rate - load impedance
Hi, To 2) ...and drive -10V with a load of 50k to GND To 3) gain flatness from DC to 10MHz: -0dB ... +2dB To 8) Suming makes no sense. It's just the range of ambient temperature your opamp should be opareabele (within given specifications). Klaus
Hello everybody!!! How am i supposed to do port's excitation of planar slot antenna using slot flatness only? (HFSS 15, wave port or lumped?) :bang: Thank you! 125879
Yes, EM separation between couplers is the main reason of flatness and better directivity. In this type of coupler changing the turns ration would not change too much the coupling. For example doubling the 10T to 20T on both transformers, the coupling will change only 3dB. If you need less sampling output, just use a pad attenuator which will do
You should provide us some more info. Think of: spectral power density (for example in dBm/Hz), or spectral voltage density (for example nV/rt(Hz) ), Frequency range (for example center frequency and bandwidth), flatness within the frequency range, sampling frequency, etc.
What are the impdance levels and how good must the galvanic isolation be (capacitance, working voltage across the isolation and peak/transient voltages)? some other things: flatness of transfer curve, insertion loss, phase, maximum physical size, etc
First of all to cover the 860 MHz to 960 MHz range you need a Log Periodic antenna, because a standard Yagi cannot cover this range with decent gain flatness over the band. You need a printed Log Periodic Antenna, which actually is not much complicated than an Yagi to build. Search the net an you get a lot of examples. I don't know how much would
To our RF experts, Kindly share your experiences on this: I did a MWO simulation for a 20W UHF broadband amplifier (470MHz to 900MHz). The simulated linear gain is around 17 to 19dB. Available test eval board of the transistor in standard Push-pull class AB config has a gain of around the same range. After verifying my prototype design (balan
Its performance is non-linear at high attenuation level. Maybe the others have the same confusion that I have: What linearity to do mean? Linearity vs. input power or linearity of attentuation vs. the nominal value or flatness of attentuation vs. frequency
We talk about receiver, so: 1. NF/Sensitivity 2. Selectivity, Co-channel rejection, Blocking 3. Probably flatness too
Hello Can anyone discuss how to improve the gain flatness in LNA. I am using a two staged resistive feedback amplifier with cascode configuration. My gain roll off ivery fast. How can I reduce the quick gain roll off?? Also, how can we establish stability in any LNA? How to move poles out and away from the desired frequency band. thanks
The system outlined by you would require two band pass filters with equal slope across their pass bands but in opposite directions. What sort of passband/centre frequency are you hoping for? The "flatness" of the pass band is of prime importance, as ripples could give more then one frequency having the same output. What is the purpose/how is this i
To get gain flatness and good return loss over this bandwidth, using this kind of schematic is challenging. I would recommend using a Norton type preamplifier which has many advantages over this frequency range. See second and third examples in the link below: RF Preamplifier
When the input attenuator is using PIN diodes only T configuration is used, because PI configuration have difficulties in realizing sufficiently low stray reactances and short transmission line lengths for operation at very high frequencies. Also when input attenuators are using lumped resistors, T configuration is preferred for flatness up to mic
If you have a PWM you need to filter its output using a LC lowpass circuit to smooth it out and then adjust the pulse width (thatīs what pwms are intended for) to achieve the average voltage you need. If the load is purely resistive you need not to filter it. The higher the frequency the smaller L and C become. For maximum voltage flatness you may
hi, i have done wideband 15dB coupler upto 6GHz. the isolation S(1,4) is increasing curve from -37.83dB (@700MHz) to -20.5dB (@ 6GHz), the coupler was designed for 700-6000 MHz bandwidth. The other parameters return loss -24dB Min, insertion loss-0.6dB Max, coupling -15dB, flatness (? 0.8dB) of the coupler are ok. how can we improve
Wideband LNA's have generally cascode additional to, a negative feedback can be applied to obtain required flatness and bandwidth. A equalization circuit ay be used at the input to get the desired flatness but this circuit can notbe realized on-chip.
Dear all, i'm facing a trouble to get flat phase response. actually i am getting phase which is changing from -180 degree to 180 degree in pass band(normally it happenes). now how can i get it flat through out my pass band( what ever the flatness comes!) please help me. thanks in advance.