EMRFD Message Archive 6314
Message Date From Subject 6314 2011-05-17 04:43:06 Russell Shaw Quad MOSFET array
"The PE4141 is an ultra-high linearity passive broadband
Quad MOSFET array with high dynamic range performance
capable of operation up to 1.0 GHz."
http://www.peregrine-semi.com/content/products/mixers/PE4140.html
http://www.peregrine-semi.com/content/products/mixers/PE4141.html6316 2011-05-17 08:20:25 w4zcb Re: Quad MOSFET array
for HF use, not likely. Four dB worse conversion loss than the FST
3125/6 series, along with >10 dB worse IMD performance. Minimum LO
frequency of 1116 MHz. Be interesting of course, to see how far below
specs it'd work.
W4ZCB
.
----- Original Message -----
6317 2011-05-17 08:58:12 Russell Shaw Re: Quad MOSFET array
> OK for the guys operating in the visible light region I suppose, butOn the datasheet, LO is DC-1GHz for the PE4141 and DC-6GHz for the PE4140.
> for HF use, not likely. Four dB worse conversion loss than the FST
> 3125/6 series, along with>10 dB worse IMD performance. Minimum LO
> frequency of 1116 MHz. Be interesting of course, to see how far below
> specs it'd work.
The app circuit (fig.10) has minimum LO = 1116 MHz only because of the
external transformer baluns.
The higher conversion loss is only from that VHF circuit including
the transformers.
Say the FST3125 bus switch has 4ohms resistance and the PE4141 has 8ohms
resistance, and they are used in series with a 50ohm source/load.
The PE4141 will have 3.8% or 0.33dB more loss than the FST3125.
http://www.fairchildsemi.com/pf/FS/FST3125.html
The PE4141 is likely to have much less capacitive leakage
between switches, and less ground-bounce coupling because
the LO drivers are external.
It seems from the datasheet the PE4140/4141 are actually
*depletion* mode MOSFETs with a Vgs(th) of -100mV.
> ----- Original Message -----
>6318 2011-05-17 09:01:59 Russell Shaw Re: Quad MOSFET array
> OK for the guys operating in the visible light region I suppose, butOn the datasheet, LO is DC-1GHz for the PE4141 and DC-6GHz for the PE4140.
> for HF use, not likely. Four dB worse conversion loss than the FST
> 3125/6 series, along with>10 dB worse IMD performance. Minimum LO
> frequency of 1116 MHz. Be interesting of course, to see how far below
> specs it'd work.
The app circuit (fig.10) has minimum LO = 1116 MHz only because of the
external transformer baluns.
The higher conversion loss is only from that VHF circuit including
the transformers.
Say the FST3125 bus switch has 4ohms resistance and the PE4141 has 8ohms
resistance, and they are used in series with a 50ohm source/load.
The PE4141 will have 8% (3.8% voltage) or 0.33dB more loss than the FST3125.
http://www.fairchildsemi.com/pf/FS/FST3125.html
The PE4141 is likely to have much less capacitive leakage
between switches, and less ground-bounce coupling because
the LO drivers are external.
It seems from the datasheet the PE4140/4141 are actually
*depletion* mode MOSFETs with a Vgs(th) of -100mV.
> ----- Original Message -----
>6319 2011-05-17 09:45:52 w4zcb Re: Quad MOSFET array
had better order a few to play with at my frequency of interest..
W4ZCB
> The app circuit (fig.10) has minimum LO = 1116 MHz only because of
> the
> external transformer baluns.
>
> The higher conversion loss is only from that VHF circuit including
> the transformers.
>
> Say the FST3125 bus switch has 4ohms resistance and the PE4141 has
> 8ohms
> resistance, and they are used in series with a 50ohm source/load.
>
> The PE4141 will have 3.8% or 0.33dB more loss than the FST3125.
>
> http://www.fairchildsemi.com/pf/FS/FST3125.html
>
> The PE4141 is likely to have much less capacitive leakage
> between switches, and less ground-bounce coupling because
> the LO drivers are external.
>
> It seems from the datasheet the PE4140/4141 are actually
> *depletion* mode MOSFETs with a Vgs(th) of -100mV.
>
>> ----- Original Message -----
>>