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# Phase Noise Thermal Noise

22 Threads found on edaboard.com: Phase Noise Thermal Noise

## can we use DRO without enclosure? (in self-mixing AIA antenna)

as long as you can make it rugged to withstand shock and vibration, temperature drift or thermal gradients and stray leakage and effects on tuning... phase noise, frequency drift often require rugged protection, so it depends on test results with your design specs. - - - Updated - - - I might suggest a fold

## Strange Noise Issue of Passie Swicthed Capcitor Circuit

106968 Very simple circuit. Suppose only the resistor produce thermal noise. Phi1 lasts mTs. Now want to calculate the Continuous time output noise PSD. My calculation is as: Devided into two phase, then add together. First during Phi1 The output is continuous time (...)

## Op-amp stability in the current and voltage references

Yes noise can make your circuit unstable. As you must be knowing thermal noise is wideband. The high frequency noise components will excite your loop. If there is insufficient phase margin, then the loop will not behave properly. If the (...)

## Phase noise in PLL- Active vs Passive Filter

Hi, I am designing a PLL using ADF4157. The VCO I am using requires around 4.5 V tuning voltage at my operating frequency. So I decided to use a passive 10 kHz loop filter. Measured control voltage was around 4.7 V and In-band phase noise was around -70 dBc (@1 kHz, @10kHz). When I switched to active filter I got around 4.3V tuning (...)

## The 27 MHz transmitter

Dear goldsmith, thank you for fast response (1) I forgot to ask you how do you know that it is a colpitts osci.? Why not Buttler? (2)From the datasheets of the transistor I found that the CE internal capacitance is typically 3.5pF, is this enough for positive FB? (3) You know that the signal at collector is 180 out of phase wrt base, and we need

## PLL noise modelling with non conventional architecture

An attenuator, unless it has broken resistor elements (like microcracking), will have flat KTB noise. Since thermal noise is half AM and half PM, the phase noise portion is 3 dB less. A mixer is NOT a resistive attenuator though. If you are modelling a (...)

## thermal & flicker noise

1- In this topology what is the difference between the flicker noise of M3 & M1? What is the upconversion mechanism of these noises? 2- How the “ thermal noise” of tail current source affect the phase noise?

## VCO jitter Gaussian Curve

Hi, I want to plot the Gaussian probability density function for the standalone VCO, to track the distribution of phase variations (jitter) over a time span Δ(T), in presence of thermal noise. It would be really helpful if someone can guide me regarding the simulation & relevant statistical analysis equations for (...)

## Who Start the Oscillator into Oscillation the First Time?

Does the world have thermal noise? Yes, I have seen it. I can walk into the lab and in a few minutes of setup I can meausre it. -174 dBm/Hz. In fact, I can measure the amplitude and phase parts of it seperately, with just a little more work. Can I see the startup of oscillations due to that (...)

## Any body know about Low Phase Noise Amplifier???

All passive and active components contribute to the phase noise of the system. If the phase noise of a component is close to the thermal power level, this will be degraded and there is no method to correct the situation. Unlike measuring phase (...)

## Question about two stage amp's settling time & total noi

This is a quetion in a exam from university of california's webcourse ee240 : Fill in the table below. The column headings are amplifier characteristics (bandwidth, phase margin, settling time, and total integrated thermal noise at the output). The first column lists amplifier parameters. In each empty cell indicate how (...)

## VCO phase noise three questions

1. Obviously the lower the phase noise the better it is. -100dBc/Hz is better. 2. Close-in phase noise will be high due to contributions from the flicker noise and up-converted flicker and thermal noise. So (...)

## VCO design with -190 dBc/Hz phase noise @ 10 KHz??

Listen, I am not going to hold a school on phase noise measurement techniques or oscillator design. Go do some reading, and stop making such outlandish assumptions about needed dynamic range, or thermal noise floors, etc. It became too much time from my graduation from the University ( (...)

## Asking for help on UHF wave band(500meg~900meg) VCO design

"Q value of the LC-tank is too high " You should study the effect of Q on oscillator phase noise. There are some easy to understand papers written by Leeson. If your phase noise is too poor, you need a HIGHER Q.

## Opamp Input pair: PMOS or NMOS?

NMOS will be better in terms of gm and hence thermal noise and bandwidth ( bandwidth will be larger at the cost of a worse phase margin ). PMOS will be better in terms of flicker noise ( however this might not be true depending on ur technology )

## how to reduce phase noise(thermal noise)

I am designing a VCO using the voltage-to-current converter as shown in the Fig.13 of "A PLL Clock generator with 5 to 110MHz of lock range for microprocessors" JSSC. 1992 Nov. phase noise simulation(PSS, Pnoise) results shows the main noise source is the (...)

## What is meant by close-in phase noise?

could anyone explain what is meant by close-in phase noise?? thanks.

## The relation between phase noise and varactor capacitance

AA The phase noise proportional to the oscillation frequency , and so , inverse proportional to capacitance, also, for tail current source, you concern with the currnet noise and so , increasing its gm will increase its thermal noise,, also, for (...)

## What is phase noise in PLL?

phase noise is to measure the amout of the phase variation in VCO. The phase noise of VCO is caused by the thermal noise or flicker noise in the circuit. Yibin.

## Noise of SC circuit in sampling phase

Now I study noise analysis of SC circuit , especially refering to Pipeline ADC papers(called MDAC). And there is a question I can't find out. In sampling phase, why shouldn't we need to think of thermal noise contribution of opamp? Most of the papers say thermal (...)