# Questions tagged [phase-noise]

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### Frequency offset for phase noise measurement

I've recently designed an oscillator for a frequency range of 80 - 100MHz. I would like to analyse the phase noise of the oscillator. From my knowledge of "phase noise", it is the power of a ...
• 33
9 votes
2 answers
420 views

### Phase noise of op-amp

Suppose I have a carrier signal with low-ish RF frequency (a few MHz) that I can reasonably amplify with an op-amp. How can I estimate the added phase noise due to the amplifier? For microwave ...
• 1,416
1 vote
0 answers
441 views

### Conversion of phase noise unit from V^2/Hz to rad^2/Hz

I have been trying to measure the phase noise of an oscillator with a homodyne interferometric measurement with an I Q mixer in the microwave domain. The output I and Q are digitized. So, after ...
• 11
2 votes
0 answers
192 views

### How to interpolate phase noise curves?

I am trying to calculate the phase jitter of a transmitter. A phase noise profile is given, say: ...
• 21
0 votes
1 answer
422 views

### How to calculate the phase noise contribution of an active loop filter in PLL

I want to calculate the contribution of each phase-locked loop (PLL) module to the total phase noise that has been done in ADIsimPLL. I'm having trouble calculating the contribution of the loop filter ...
1 vote
1 answer
3k views

### Phase noise units: dBc/Hz --> dB(rad/√Hz)

Trying to better understand phase noise units and characterize a device to compare with specs. I'm used to measuring in dBc/Hz, but the specs given are in dB(rad/√Hz)/m, which I guess is fairly ...
0 votes
0 answers
91 views

### why the control voltage of VCO in CP PLL oscillates?

I built a verilogA model for every block used in PLL, I replaced a verilogA model for VCO with a designed one but, I got oscillations imposed on the control voltage as shown below. Fdiv is the ...
0 votes
0 answers
126 views

### Does the profile of phase-noise power spectrum density (PSD) vary with time?

I will promptly provide any detail or revise my question aimed at any feedback. Does the profile of phase-noise power spectrum density (PSD) vary with time? The conclusion may be that it won’t ...
• 41
0 votes
2 answers
96 views

### The mean value of phase noise as a stochastic process

What is the mean value of phase noise as a stochastic process? Where can I get a theoretical analysis of this topic?
• 41
2 votes
1 answer
235 views

### Two details about phase noise have been confusing me for a long time. Hope to be resolved

Just like FLOYD M. GARDNER said in the PhaseLock Techniques, 3rd Edition: "In light of that success in spectrum analyzers, a practitioner’s answer to the question above is: The spectrum of phase noise ...
• 41
0 votes
1 answer
87 views

### Single tone signal generation at microwave frequency with best phase noise and spurious performance

What is the best way to generate a single tone signal with best phase noise and spurious performance? Is frequency multiplication the best way? single stage multiplication or multi stage ...
5 votes
1 answer
352 views

### Can phase noise be averaged out?

I have an ADC sampling a downconverted RF signal at fs. I obtain N=2^15 samples of the RF input signal "fcarrier + fs/10". The more I average, the more the entire noise floor shifts down (as expected,...
• 1,306
4 votes
2 answers
378 views

### Phase noise reduction in LC oscillator with a high-loss capacitor

I`ve got a capacitive vibration probe whose base capacitance may vary from 4 to 10 pF due to manufacturing/installation tolerances, whereas vibrations it detects can only alter its capacitance in sub-...
• 307
4 votes
1 answer
206 views

### A capacitor as loop filter of a DLL

I know that if a second order, type two PLL has only a capacitor as its loop filter, it is unstable because its phase margin would be zero. but why is it ok for a DLL to only have a capacitor as its ...
• 103
1 vote
1 answer
731 views

### Error with phase noise to jitter calculation

I'm trying to get the jitter for an oscillator. The nominal frequency $f_0$ is 10 MHz, I'm integrating from 1 Hz to 100 kHz. The specifications are given as "RF Output Phase Noise (SSB)", in dBc/Hz. ...
• 832