[time-nuts] high rev isolation amps

jimlux jimlux at earthlink.net
Sat Mar 26 20:16:38 EDT 2016


On 3/26/16 3:25 PM, Bruce Griffiths wrote:
> On Saturday, March 26, 2016 09:30:30 PM Rob Sherwood. wrote:
>> You cannot add the directivity and gain.  Doesn't work that way.  Rob, NC0B.
>>
>> Sent from my iPad
> Minicircuits would disagree with that and its their amplifier.
>
> Bruce
>>

Well, it's a bit inconsistent between gain, directivity and S parameters.

at 5.4 MHz the ZFL-500LN has the following S parameters @ 15 V in the 
.s2p file (there's two units' measurements in the files)

S11 -35.5, -32.1
S21  29.7,  29.5
S12 -47.5,- 47.2
S22 -39.5, -28.3

On the other hand, the data sheet "typical data" says: at 5.4MHz 27.9 dB 
gain, 26.5 dB directivity, which Minicircuits defines as isolation-gain 
  (implying isolation is 54.4)
http://www.minicircuits.com/pdfs/ZFL-500LN.pdf

Maybe there's some sort of assumption about source/load impedance (e.g. 
not necessarily perfect 50 ohms)







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