Zgledi
23 - Active-device noise and loaded-resonator quality
Resonator
QL
RC (~BWO)
tunable (VCO)!
~1
LC (~EIK)
tunable or fixed!
~30
YIG @3GHz
tunable!
~300
Metal cavity
@3GHz fixed!
~3000
Ceramic dielectric
@3GHz fixed!
~3000
Quartz crystal
@100MHz fixed!
~30000
Sapphire dielectric
@6GHz fixed!
~300000
Electro-optical delay
@6GHz fixed!
~100000
Active device
Schottky diode
~300K
Transistor
(BJT or FET)
~300K
Tunnel diode
~300K
Gunn diode
~300K
Vacuum tube
~10000K
Avalanche diode
(Impatt diode)
~3000000K
Noise
temperature