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# Flatness

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84 Threads found on edaboard.com: Flatness

## Problem with S21 gain flatness in an amplifier

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.

## second order system for group delay and gain flatness ?

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

## Improved Gain flatness

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.

## How to measure spectral flatness in Matlab?

what is the measure of spectral flatness? how can i implement it in matlab?

## P1db flatness of power amplifier

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

## PAPR and RF spectrum flatness

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.

## Gain Flatness in Low Noise Amplifier Design

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.

## Gain flatness improvement and stability

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

## Need help with Grid Dip Oscillators!

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

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

## how can o design a wideband amp??

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. thank you What kind of amplifier do you intend to design? Low Noise , High Gain , High Power ? Please be specific.. What is your f

## wide band IF amplifier design help

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?

## Help me design a 3x frequency multipler

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

## Help me get PCB specification: epsr, thickness

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. :)

## Digital Frequency Synthesys Demystified

Digital Frequency Synthesys Demystified, DDS and Fractional-N PLL, Bar-Giora Goldberg 1999 LLH Technology Publishing. ISBN: 1-8787047-47-7 336 pages Contents Prefaces xi Symbols xv Chapter 1. Introduction to Frequency Synthesis 1 1-1 Introduction and Definitions 1 1-2 Synthesizer Parameters 5 1-2-1 Frequency Range 6 1-2-2 Freque

## Designing n-degree analog filter

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.

## Help me with my HPA design

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

## Please recommend an amplifier chip !

Please recommend an amplifier chip The following of index Frequency 10-500MHz small signal Gain(min) 17dB Gain flatness(max) 0.2dB Reverse isolation 36dB Noise Figure 4dB Power output 1dB 8dBm ip3 20dBm ip2 28dBm second

## a question about using feedback method in UWB LNA design

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!

## High speed coupling capacitor

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

## waveguide filter fabrication

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

## generating random noise in MATLAB

Uniform white noise and gaussian white noise both give you flat spectrum. They have different point distributions. s = rand(10000,1) - 0.5; plot(abs(fft(s))) s = wgn(10000,1,1); % maybe requires communication toolbox plot(abs(fft(s))) mro83, do you see something non-flat there? Maybe you simply need to increase the number of data point

## Question of spectrum due to switching on GSM mobile phone.

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

## Help me with interstage matching of two stage amplifier designs

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....

## help me to diffential those filters....

Hello, 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 Butterworth

## questions in receiver nonlinearity specs for mobile WiMax

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.

## how to select filter prototype?base on what?

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

## Looking for these datasheet LNA

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

## How to design a bandpass filter with Freq=19.44M,bdwidth=10M

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

## LNA + mixer simulation ?

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

## How to design such an op amp?

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

Dear, Please suggest me in Design of Power Amp Specifications 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 Thanks

## about stability of an amplifier

Hi, all 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. Comp

## How to introduce a microstrip delay to existing 50 ohm microstrip line transmission?

Uh, make it longer? If you want a more useful answer, you might provide: frequency, bandwidth, fixed or varying delay, delay flatness, vswr, etc

## solution for 2W X band with -35dBc 3rd IM

flatness 1db, temp -20~+50

## how to improve Gain stability for multi-stage PA

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

## series LC feedback network

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!

## measuring sensitivity of RF preamp?

Some important characteristics of preamplifiers are: -Noise Figure -Gain -In-Band Gain flatness -Input IP3

## Rx+ baseband filter and VGA overall voltage gain simulation?

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

## Looking for Step Attenuator design

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

## OFDM consideration in the RF Front end of receivers!!

Imar 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. Mazz

## Problem with Matching network

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.

## power amplifier problem - want to use MHW10276N

I have to design a power amplifier. Frequncey ：30MHz~400MHz; Pout>=25W CW; Power supply：27V; IMD3(at)25W CW <-30dBc; gain>=30dB; gain flatness<2dB； 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

## Odd Order of Hilbert Transform Question?

Hi All, 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

Hey, 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 

## Uneven PTFE laminate and PCB production

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

## Choice of Number of mixers and IF frequencies

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 Dynamic range suppression of jammers/interference system tolerance of known spurs system tolerance of image frequencies cost dynamic range A

## How to design a high speed high precision op-amp?

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/

## RF demultiplexer. Help me,plzz

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.

## GENERAL QUESTIONS about Bandgap Reference

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