I'm giving my kids a little lecture on noise this afternoon. Here's my outline.
Did I miss anything?
Noise In Electronics Notes
JL Feb 25, 2019
Conductors, atoms, electrons
Johnson/Nyquist noise Ej = sqrt(4KTRB) RMS Power, voltage, current Flat finite spectrum CoE Equivalent thermal conductivity The sky is cold
Shot noise Is = sqrt(2qI) RMS Not in metallic conductors, maybe in cermets/carbon In semi junctions, base currents, photodiode currents Worse in PMTs and APDs PMTs as radar jammers
Excess noise 1/f flicker grain boundaries pentode grid partition tempco driven
Thermal noises Resistor tempco Air flow turbulance Thermoelectrics
Piezo noise, mostly caps
Magnetic loop pickup
Opamps Voltage and current noise PSRR RF rectification
Bipolar transistors Rb
Jfets
CMOS Popcorn noise
Fans Vibration Mag fields E fields from blades power supply ripple
RF Junction rectification Digital logic spikes TV, cell phones Sutro tower Fluorescent lights, motor controllers
PSRR Can be worse than 0 dB Watch DC, too
IC photo sensitivity chip-scale stuff
Ground loops Many goofy theories about grounds and shielding Differential is best
Zeners and noise diodes
Gas discharge devices Noise tubes in magnetic fields Neons in waveguides
Noise figure meters
Noise makes jitter
Spice No noise analysis in time domain Can cheat
PCB layout