[time-nuts] Low Phase Noise Amplifiers

[Gerhard Hoffmann]

Am 11.01.20 um 15:36 schrieb Charles Clark:
> I wonder if adding active bias feedback around the RF transistor to 
> reduce the low frequency current variations would help.  This is the 
> classic PNP bias scheme which can be applied to BJT's or FET's.  I 
> have used it to successfully improve the phase noise on oscillators.  
> Details from T.T. Ha, or Gonzales books on Amplifiers.
>
... and available as cheap SOT343 chip from Infineon:  BCR400W

< 
https://www.infineon.com/dgdl/Infineon-BCR400W-DS-v01_01-en.pdf?fileId=db3a30431400ef68011407e93d8601a1 
      >

I vaguely remember that its use in an oscillator has been patented.    =8-()

cheers, Gerhard