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91 Threads found on Noise Match
Hi, I'm performing a noise analysis in LTspice IV. Unfortunatly te function LTspice2Matlab, which is available at just supports transient and AC analysis. So I have to export my resulting noise density voltage via File -> Export. The exported file format is a txt document. After importing the values from
Hello guys, I am designing an LNA and would like to match it for a nearly optimum noise condition. Im running in trouble trying to design the input matching network, which should convert a 50 ohm source to my desired source impedance (lets say 10 + j*10 Ohms). So far the matching tools that Ive been using (...)
First of all, your attachment didn't make through. There are exactly 4,193 reasons why this isn't working; a few of them are: Your baudrates don't match Your parity doesn't match noise You don't have your handshaking signals driven (or connected) (they supply power for the device) Your cable is incorrect Your software is incorrect (not (...)
Most of the high-linearity VGAs use an integrated step attenuator in front of a fixed gain amplifier, as for example LMH6521 from TI: Advantage using a step attenuator in front of the fixed gain amplifier is not only to keep good linearity, but also to improve input/output match, and the gain flatnes
Rather then a function generator, a sine wave oscillator 20 - 20kHZ with really low distortion, say 10 times lower then the distortion that you would expect to get from your products. And to match it a noise and distortion measuring set or a wave analyser (audio form of a spectrum analyser). With a suitable load, you can then set up the rated p
Hi friends, Why is it necessary to match LNA at the input if input is a gate i.e. purely capacitive. I understand max power transfer and min noise figure concepts. My question is since we are concerned about voltage swing at the LNA input, why not drive the LNA directly with source ( Rs=50 ohm).
Dear Sir, I have taken the Avago ATF54143 transistor and designed low noise amplifier (LNA), simulated S-parameter and noise Figure values at 1GHz as follows S11= 0.581(Mag) and 19.2444(Angle), S21=10.412(Mag) and 179.792(Angle),S12=0.046(Mag) and 139.669(Angle),S22=0.363(Mag) and 51.049(Angle),NF(noise Figure) = 0.543dB, (...)
Can we use conjugate matching at the input for mimimum noise matching ????, Can anybody explain the logic behind not using conjugate matching for minimum noise matching I think you are getting it all wrong here. Low noise devices are characterized by Γopt provided (...)
If the amplifiers became more sensitive to the pickup noise, consider a better screening and input low-pass filtering.
The junction of R4 and R5 will produce much less noise if it has a filtering capacitor to ground. You do not need a buffer at the input of the simple filter. This circuit uses signal voltage, not signal power. If you match impedances then the signal level drops to half, which will double the noise level.
It is very common. A good example are GaAs FET amplifiers. The gate of the FET may have a S11 of >.9 making it very difficult to get a good match at a single frequency due to component Qs and stability issues. This task becomes impossible over a broad frequency range. Also the optimal noise figure match does not occur with a S11=0 but (...)
Hello all, I am designing a Common source Cascode low noise amplifier. How do we match the circuit at the output to 50 ohms ? As I understand , we use an inductive load to get rid of parasitic capacitance of the transistor. So, we are only left with the intrinsic resistance of the transistor. We can not use the matching network to (...)
Hi all, I have question about the receiver noise figure. If I have a rx antenna with 6dBi gain, and the duplexer with 2dB loss cascaded after the antenna. Then what's the output noise power at antenna output and duplexer output, suppose that all interface are conjugate match. If I need to caculate the receiver the noise (...)
Hello Edaboard, Please check if my explanation for PLL is right, if any mistakes please correct it. PLL is a device which makes use of negative feedback so as to match the frequency and phase of a input signal avoiding noise and jitter in it to the ouput signal. So the output signal will have the
The idea is to estimate the spectral magnitude of noise using noise match filter, and making use of the fact that power spectra of additive independent signals are also additive and that this property is approximately true for short-time estimates as well. Hence, in the case of stationary noise, it suffices to subtract the (...)
Hello, Currently I'm working on the LDO reg. PSpice macromodel but I have some concerns about the output noise modelling. After studying some papers on Op-Amp macromodels I was able to obtain fairly good match between the Output Voltage noise Density Measurements and Simulations in 10Hz-1MHz bandwidth. (The noise source (...)
... Some say series is good as it will match the models well I think you picked the right point. But if you don't need high accuracy results from the analysis, a single long transistor will work quite well -- if it's allowed by your PDK simulation models. There should be no difference in noise injection for
Use a timer set to compare match that toggles the output // Timer/Counter 1 initialization // Clock source: System Clock // Clock value: 16000,000 kHz // Mode: CTC top=OCR1A // OC1A output: Toggle // OC1B output: Discon. // noise Canceler: Off // Input Capture on Falling Edge // Timer 1 Overflow Interrupt: Off // Input Capture Interrupt: Off
With Monte Carlo you might have to run 30-100 simulations before you got a good estimate of the standard deviation (SD) due to random mismatch. On the other hand, DC match is a sensitivity analysis that is much like a noise analysis. It will give you the SD in a single simulation, making it very useful for large circuits. The downside is (...)
Hi all, I am doing an input network to match noise figure of a FET, but I get stuck trying to match the low freq of the network to the low freq of Γopt and high freq to High freq. I can match them one at a time, but is there a way to reverse direction on the smith chart? The optimum NF follows a curve (...)