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38 Threads found on edaboard.com: Flatness
I am building a directional coupler for HF and I need it to be as flat as possible on 1-30MHz because it will drive an ALC circuit of an oscillator. It terms of isolation and flatness, is it better to use the single binocular core version or the two toroids version
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
You mean linearity or flatness? If you mean flatness, the result you get is as expected. When you increase the attenuation, gain(negative) flatness worsens as you see from the datasheet and it is not avoidable.
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 (that´s 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.
I do not understand the question. PAPR is measured in time domain. PAPR=(max(s))^2/E( (s)^2 ) Spectrum flatness does not depend from PAPR.
Requirement: 1. MESFET switches (note: NOT CMOS) 2. Steps 0.5, 1, 2, 4, 8, 16 dB 3. Small Thru insertion loss < 1.6dB (up to 2GHz) < 2 dB (up to 3GHz) 4. Bandwidth, 700MHz ~ 3GHz or even higher 5. GOOD step flatness < +/-5% 6. Fast switching time (90% settling) < 1uS I believe this is a very challenge design, I am looking for a referenc
Dear all, I have a Rx chain (included LNA+mix1+mix2) + baseband filter and VGA. I have combined all together and run the PSS + PXF in order to get the overall voltage gain. However, the simulation result is strange to me. It gives the M-shape voltgae gain and the voltage different is 10dB. However, the voltage gain flatness of Rx chain is within
Some important characteristics of preamplifiers are: -Noise Figure -Gain -In-Band Gain flatness -Input IP3
Hi all, Have a general question about series LC feedback network that connect between gate & drain of the FET. i am trying to have a good gain flatness in my amp from 50MHz to 2.6GHz within 1dB margin. Now my S21 @ 50MHz is 28dB, and gain @ 1.7GHz and 2.6GHz is around 19.5dB. Thanks!
Actually the Gain flatness shouldn't be a problem in a multistage PA because there are more possibilities to adjust the Gain vs Frequency (input, output and interstage match). For good stability the interstage matching topology plays an important role, as well the bias filtering of each stage. Not to the last, the gain distribution per stage c
dear all, How can i to design a match to make P1dB flatness from 2110MHz to 2170MHz, Now the 2110MHz is 1dB higher than 2170MHz
what is the measure of spectral flatness? how can i implement it in matlab?
Take a look at these buffers For you application, gain flatness over the signal's spectrum should be the most important condition. This link has a selection table: Many other semiconductor companies have similiar buffers. Read
u need to make the S parameter simulation detect frequency translation , and try to use HB simulation to get the gain about the gain flatness , i think u should use wide band matching circuit and also try to make the mixer gain flat alone khouly
Hi, Like to know any advice to improve gain flatness of the amplifer? Additional info: I had used serie high inductance and high shunt cap for the DC supply to the amp, and also for the DC block at the input and output of the amplifer, I have place high Cap value. Thanks.
Although the filters may have the same basic topologies the value of filter elements determine filter properties. These are flatness, passband ripple, steepness, stopband attenuation, group delay characteristic etc. Each filter type has it's own transfer function usually named by inventors name. These are Gaussian, Bessel, Butterworth, Legendre, Ch
Does anyone has these datasheet lna? The Spec. are : Manufacture : TITAN Gain min : min.60 dB Freq. : 3400 - 4200 MHz Voltage : 12 - 24 Volt flatness : max. 1 dB/500 MHz max. 0.3 dB/40 MHz Temp. Noise : max. 40 K Input
is it an IC design or discrete level design? actually to have a gain flatness, you have to have a mismatch between source to load...its called selectively doing so you get stable gain in all frequencies....
Dear amicloud, I have same experiance of phenomenon. Of course, I don't know the fabrication situation; structure of filter. I guess you apply inductive iris filter. The problem is the flatness of surface in body and cover. Small gap exists in connect plane. And if you fabricate it by CNC, body is twist, maybe. You must check it. I
Hi, Ipanema You can use multi-layer ceramic capicitor. We use 0805 for cable tv application It need flatness response from 5MHz to 1Ghz. I think it will not cause problems in your system. Regards, Wenye
Hi, In order to increasing the Gain flatness,we often add R,L and C between G and question is how to calculate the actual value of them for a certain bandwidth? for example,2~10GHz Thank you!
Hi, guys: i am looking for the books or paper which analyze second order system well. I expecially want to know about when will the 2nd order system give best phase linearity, best gain flatness, minimum peaking in feedback, settling time. Some one ever told me there is a paper on that, can any one tell the title? thanks, Han
MRF9045 is an internal pre-matched transistor designed for 930MHz to 960MHz band. This is the reason that you get poor gain flatness at 1.2GHz. It is a chance to improve the gain flatness using multiple poles for the external input and output match. Good luck
that is ultra wide amplifier. I guess you are evaluating the COTS product? If you design the amplifier chip, you should know how to compensate the gain flatness by using distributed amplifier topology.
Frequency multipliers using diodes work fine, but it is very hard to get good output level flatness over frequency. Also the output power in this multipliers changes significantly over temperature, meaning that a lot of circuitry would be need in order to stabilize its output. If only positive power supply is an issue in your design, FETs would
I want to design an amplifier inband is 200-400MHz now the problem is that if I get the gain flatness in 1dB , the inband return loss will be poor. This is due to most transistor has high gain and poor gain flatness at low frequency in a relative wide band. Any advice can help me to catch both gain flatness and good RL?
Hi Rein, setup of a GDO is more matter of mechanics than electronics. Poor circuits lack on sensitivity more than amplitude flatness and your GDO bandwidth it's relatively small. Anyway remeber that you normally meter oscillator current not amplitude. Try to take a look for GDO pictures more than circuits paying special attention to the tank se