# Tag Info

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

XY problem, you have what is effectively a capacitor microphone element, with one side grounded and you wish to build an RF Mic. Were it me, I would not make it part of the oscillator instead using ...
• 17.6k
Accepted

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

The HP3033 synthesizer used a VCO something like this simulate this circuit – Schematic created using CircuitLab Notice how the two VDD bypass capacitors have their RETURN nodes tied into the ...
• 34.6k

### A capacitor as loop filter of a DLL

A PLL will measure phase and turn it into a frequency. The VCO in a PLL will perform an integrating action which adds a pole at s=0. This adds 90 degrees phase in the open loop gain. If only a ...
• 5,237
Accepted

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

Noise is a slippery concept that sort of wriggles out of the way as you try to define it at low frequencies, phase noise in particular. Remember, noise is a model. A PLL is a physical system with its ...
• 170k

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

stochastic process = random process e.g. thermal noise added to signal causing phase noise measured near carrier in dBc/Hz at an offset from carrier, measured as single-sideband or 1/2 double-...
• 145k
Accepted

### How is the $M^2$ term derived in the PLL output phase noise spectrum?

The PLL simply "amplifies" the phase quantities by $M$ within its bandwidth. Thus, a factor of $M$ emerges in the input-output relation. When dealing with power spectral densities of ...
• 321

### Phase noise of op-amp

I have done some simulations and I see that the 1/f noise does not seem to have impact on phase noise only the white noise has impact as long as the amplifier is linear. I have modeled the amplifier ...
• 3,852

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

To calculate the voltage noise density at the output of your low-pass filter, you must first calculate the individual voltage noise contributions of your resistors using $v_n=\sqrt{4kTR}$ (without ...
• 752
1 vote

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

The power spectral density (PSD) of a random phase $\varphi(t)$ is denoted with $S_{\varphi}(f)$ in units of $\mathrm{rad}^2/\mathrm{Hz}$ or as $10~\log_{10}(S_{\varphi}(f))$ in units of \\$\...
• 752
1 vote

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

The Lorentzian describes that flat-topped behavior. [I initially wrote Lambertian, in error] Regarding the DC power, cyclo-stationary statistics work in the 1990s validated the classic Leeson ...
• 34.6k
1 vote

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

Watch out with asking for "the best". Suppose I have here an "Ultiwaveform RFgen extraspec. deluxe" (I just made that up, it does not exist) for sale, it will deliver the cleanest 6 GHz signal ever ...
• 81.1k

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