J
John Larkin
Guest
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
--
John Larkin Highland Technology, Inc
picosecond timing precision measurement
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
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
--
John Larkin Highland Technology, Inc
picosecond timing precision measurement
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com