92 Threads found on edaboard.com: Flatness
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.
RF, Microwave, Antennas and Optics :: 04-15-2004 20:53 :: activewei :: Replies: 3 :: Views: 1320
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?
Analog IC Design and Layout :: 12-08-2004 03:42 :: mike_bihan :: Replies: 1 :: Views: 916
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.
RF, Microwave, Antennas and Optics :: 10-04-2006 23:26 :: J0hn :: Replies: 3 :: Views: 1063
what is the measure of spectral flatness?
how can i implement it in matlab?
Digital Signal Processing :: 05-08-2007 08:53 :: omidi_sbu :: Replies: 2 :: Views: 4006
How can i to design a match to make P1dB flatness from 2110MHz to 2170MHz,
Now the 2110MHz is 1dB higher than 2170MHz
RF, Microwave, Antennas and Optics :: 08-07-2007 00:12 :: asoscjn :: Replies: 2 :: Views: 533
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.
Digital communication :: 12-01-2009 13:23 :: ux :: Replies: 10 :: Views: 1728
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.
RF, Microwave, Antennas and Optics :: 02-22-2010 08:41 :: BigBoss :: Replies: 2 :: Views: 1363
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.
Analog IC Design and Layout :: 05-26-2012 02:06 :: s_ss :: Replies: 1 :: Views: 482
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
RF, Microwave, Antennas and Optics :: 01-23-2003 09:00 :: syzzler :: Replies: 1 :: Views: 1594
LTCC is a good approach for a front end when cost and/or complexity are driving the design. It has decent thermal charateristics, although electrically, due to the roughness of the metalization, the losses can be a little higher than soft substrate.
Reasons to use LTCC:
- Extremely complex multilayer circuits (30+ Layers) including over 80,0
RF, Microwave, Antennas and Optics :: 10-05-2003 22:49 :: JoeSchmo :: Replies: 4 :: Views: 1230
Help me please?
i wan to design a 6GHz amp working from 5 to 7GHz.
i have never designed this sort of amp.
i am looking for these topics and some success designs.
What kind of amplifier do you intend to design? Low Noise , High Gain , High Power ? Please be specific..
What is your f
RF, Microwave, Antennas and Optics :: 11-20-2003 18:26 :: BigBoss :: Replies: 14 :: Views: 2724
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?
RF, Microwave, Antennas and Optics :: 12-24-2003 20:44 :: BigBoss :: Replies: 2 :: Views: 951
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
RF, Microwave, Antennas and Optics :: 04-11-2004 22:58 :: nandopg :: Replies: 13 :: Views: 4930
Of course, printed filter could be used with good insertion loss flatness. If you could afford, try to design with larger bandwidth than your requirement. The flatness of the filter tends to be flatter in small band centering the centre operating frequency.
Electromagnetic Design and Simulation :: 04-18-2004 02:05 :: lguancho :: Replies: 6 :: Views: 1232
Digital Frequency Synthesys Demystified, DDS and Fractional-N PLL, Bar-Giora Goldberg
1999 LLH Technology Publishing.
Chapter 1. Introduction to Frequency Synthesis 1
1-1 Introduction and Definitions 1
1-2 Synthesizer Parameters 5
1-2-1 Frequency Range 6
RF, Microwave, Antennas and Optics :: 06-16-2004 17:02 :: papyaki :: Replies: 1 :: Views: 1847
There are monographs with filter order coeficients people have calculated them from decades ago. It simplifies task of determing component values.
"On the Theory of Filter Amplifiers," Wireless Engineer, vol. 7, 1930, pp. 536-541 by Stephen Butterworth (hence the name!)
"Cascade Amplifiers with Maximal flatness," RCA Review, vol. 5, 1941, pp.
Analog Circuit Design :: 09-17-2004 09:35 :: djalli :: Replies: 13 :: Views: 2879
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.
RF, Microwave, Antennas and Optics :: 08-28-2004 08:49 :: vfone :: Replies: 3 :: Views: 1008
Please recommend an amplifier chip
The following of index
small signal Gain(min) 17dB
Gain flatness(max) 0.2dB
Reverse isolation 36dB
Noise Figure 4dB
Power output 1dB 8dBm
RF, Microwave, Antennas and Optics :: 12-13-2004 09:22 :: flybird23 :: Replies: 7 :: Views: 904
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?
RF, Microwave, Antennas and Optics :: 04-12-2005 07:10 :: lader.Z :: Replies: 0 :: Views: 510
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.
Analog Circuit Design :: 05-24-2005 01:00 :: Wenye :: Replies: 13 :: Views: 2708
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.
RF, Microwave, Antennas and Optics :: 06-16-2005 21:33 :: HOHOH :: Replies: 2 :: Views: 804
Uniform white noise and gaussian white noise both give you flat spectrum. They have different point distributions.
s = rand(10000,1) - 0.5;
s = wgn(10000,1,1); % maybe requires communication toolbox
mro83, do you see something non-flat there? Maybe you simply need to increase the number of data point
Digital Signal Processing :: 08-02-2005 12:15 :: echo47 :: Replies: 7 :: Views: 36011
Is this only happen under power level 0 or all power level.
If only power level 0 has this issue, please check the Tx power in link mode.
Maybe the PA is saturated in high channel.
Please reserve at least 0.5 dB margin for target power.
Ex: if target power is 30dBm, you should fine-tune PA matching to Max output power is 30.5 dBm for all channe
RF, Microwave, Antennas and Optics :: 04-17-2006 03:19 :: rhjang :: Replies: 3 :: Views: 1154
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....
Other Design :: 07-31-2006 09:05 :: MK28 :: Replies: 3 :: Views: 1240
Filters are basically of two types passive and active. Passive filters use RLC components for selecting the cut off frequencies. Active filters have passive components as well as active components like operational amplifiers. Passive filter topologies are basically T network, Pi networks.
Active filter topologies are
Analog Circuit Design :: 08-07-2006 23:14 :: chviswanadh :: Replies: 3 :: Views: 676
the mobile Wimax is defined in licensed bands: 2.3-2.x, 3.x GHz. PA must have a 45 dB dynamic range and a limitied relative constellation errors, -30 dB for 64-QAM-3/4 case. Beside a spectral flatness given by the standard and spectral mask left to local regulations.
RF, Microwave, Antennas and Optics :: 08-27-2006 21:05 :: ghadahamdy :: Replies: 2 :: Views: 916
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
RF, Microwave, Antennas and Optics :: 09-12-2006 00:18 :: Borber :: Replies: 1 :: Views: 630
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
Hobby Circuits and Small Projects Problems :: 09-11-2006 23:22 :: yugamart :: Replies: 0 :: Views: 877
You need to do some research on the kind of filter you need first. You need to decide on such things as the selectivity, order, passband ripple/flatness, sideband attenuation and other parameters.
Then you can decide on a type of filter such as Butterworth or Chebyshev, and active or passive implementation.
Once you know what you want there
Analog Circuit Design :: 10-11-2006 21:53 :: newelltech :: Replies: 5 :: Views: 801
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
RF, Microwave, Antennas and Optics :: 10-26-2006 09:33 :: khouly :: Replies: 4 :: Views: 1028
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.
Analog Circuit Design :: 11-04-2006 13:05 :: tanuki :: Replies: 4 :: Views: 791
Please suggest me in Design of Power Amp
Bandwidth 10.5Ghz ~ 11.5 GHz
Output power at 1db compression point 5W
Gain - 30dBm at 1 db compression
Gain flatness 2dBm
Pls suggest me about it
RF, Microwave, Antennas and Optics :: 11-08-2006 04:48 :: kyawmyatthu :: Replies: 1 :: Views: 810
I am wondering about the stability of a given amplifier, is there anybody who can tell me what matters will affect the stability of an amplifier?
Thx in advance
Many factors. Total gain, circuit noise, frequency range and flatness, output and input impedance match to the load device and source signal.
Analog IC Design and Layout :: 10-23-2007 09:09 :: leftyretro :: Replies: 7 :: Views: 656
Uh, make it longer?
If you want a more useful answer, you might provide: frequency, bandwidth, fixed or varying delay, delay flatness, vswr, etc
RF, Microwave, Antennas and Optics :: 12-12-2007 15:15 :: biff44 :: Replies: 3 :: Views: 1549
RF, Microwave, Antennas and Optics :: 01-07-2008 23:10 :: amicloud :: Replies: 2 :: Views: 460
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
RF, Microwave, Antennas and Optics :: 01-11-2008 15:25 :: vfone :: Replies: 5 :: Views: 1418
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.
ASIC Design Methodologies and Tools (Digital) :: 04-15-2008 14:20 :: MI3talk :: Replies: 0 :: Views: 367
Some important characteristics of preamplifiers are:
-In-Band Gain flatness
RF, Microwave, Antennas and Optics :: 07-06-2008 15:37 :: vfone :: Replies: 12 :: Views: 1438
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
RF, Microwave, Antennas and Optics :: 08-29-2008 11:59 :: wccheng :: Replies: 0 :: Views: 659
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
RF, Microwave, Antennas and Optics :: 09-30-2008 00:40 :: cmosbjt :: Replies: 6 :: Views: 1369
the requirements for the RF front end are always the same: bandwidth, gain, noise, linearity.
Particular attention has to be taken in gain flatness and in linearity, as the ofdm signal can have an high peak-to-average ratio.
RF, Microwave, Antennas and Optics :: 02-16-2009 22:23 :: Mazz :: Replies: 11 :: Views: 1682
Please do not try to match the amplifier to MAG, the amplifier may lead in to several problems like
stability, gain flatness over band, poor 50 ohm matching etc.
It is always better to target 2 to 3dB lower to MAG.
RF, Microwave, Antennas and Optics :: 02-24-2009 08:10 :: kspalla :: Replies: 2 :: Views: 546
I have to design a power amplifier.
IMD3(at)25W CW <-30dBc;
I want to use MHW10276N of freescale as first stage,but there is no sale in freescale,who can tell me which amplifier can replace it?
and I want to use D1020UK of se
RF, Microwave, Antennas and Optics :: 03-13-2009 10:10 :: Boowei :: Replies: 5 :: Views: 867
I have a baseband signal 0Hz~48KHz, and sampling rate is Fs = 1.536MHz, I need to mix this base signal to IF, which is about 384KHz, but when doing mix, I do not want the Double-Side-Band (DSB) signal but Single-Band-Signal (SSB), so I will considering design a Hilbert transform to mix my base band signal to IF. Since there are two type
Digital Signal Processing :: 03-31-2009 03:31 :: xie.qiang :: Replies: 0 :: Views: 579
I have to design a power amplifier in 130 nm technology witht he following specs
Power Output: > 23dBm (at PA output)
Total Power Consumption: < 0.5W @ 16dBm CW output power
RF Input Signal @ 2.45GHz : 1Vp-p sinusoid if single ended
-- differential or single ended 1.414Vp-p if differential
Input Source Impedance 50
RF, Microwave, Antennas and Optics :: 04-09-2009 15:14 :: mehul87 :: Replies: 0 :: Views: 646
I'm trying to use PTFE laminate (Arlon's CuClad217) for our PCBs of prototypes and proofs-of-concept. Due to our kind of work we manufacture small amounts of PCBs (usually single prototypes).
It happens that, due to the very flexible nature of CuClad217, the raw boards always get some corrugation, i.e., the piece of CuClad217 is no
RF, Microwave, Antennas and Optics :: 04-14-2009 13:26 :: etmabreu :: Replies: 0 :: Views: 571
You ask a very general question. IF frequency and the number of mixers is determined by your technical requirements:
Spurious output level
Input frquency range
Desired instantaneou receive bandwidth
suppression of jammers/interference
system tolerance of known spurs
system tolerance of image frequencies
RF, Microwave, Antennas and Optics :: 05-06-2009 02:51 :: biff44 :: Replies: 4 :: Views: 718
Are you asking for a 100MPG Maserati?
High precision (or accuracy) tends to want elaborate
error cancelling circuits at the front end. That baggage
is not your friend if you want bandwidth.
What are your accuracy "values"? Do you just want
a minimal Vio? Can you stand having chop-tones, to
get it? Bias current, bias current flatness w/
Analog IC Design and Layout :: 10-01-2009 17:06 :: dick_freebird :: Replies: 4 :: Views: 1153
It is a filter structure. You are going to have to know something about the specific filter design in order to "simulate" it. Once you know the cricuit schematic, and the component values, you can run any linear microwave simulator to get the bandwidth, insertion loss ripple, group delay, group delay flatness, etc.
RF, Microwave, Antennas and Optics :: 10-02-2009 16:07 :: biff44 :: Replies: 7 :: Views: 1037
BJTs are better because their internal current gain tends
to linearize the "diode" curve (log-linear). Diode curvature
is a second (or higher) order effect which you can't do much
about, with circuit methods. Other than lumping it in with
the other curvature terms and trying to comp it. But the
diode curvature is a special problem because you
Analog IC Design and Layout :: 11-05-2009 10:23 :: dick_freebird :: Replies: 7 :: Views: 1670