EMRFD Message Archive 6004
Message Date From Subject 6004 2011-04-03 00:49:25 ha5rxz Another Mixer Allison and others, how about using a TA4107F device? This chip is used in the Kenwood TS-480 as a transmit mixer and they quote -0.5dB loss.
Peter HA5RXZ6005 2011-04-03 05:19:05 Tim Re: Another Mixer From the datasheets I was able to find, it's a Gilbert cell biased for low voltage (4.5V Vcc - I think they're clever in the bias network) and quite highish currents (32mA) meaning impedances in the hundred-ohm ballpark. i.e. an excellent choice for Transmit mixer.
I'm not sure what a "-0.5dB loss" number means in context of an active part that would usually have a gain? Maybe some mixer figure of merit that I'm unfamiliar with. For comparison, MC1496 and NE602 will (depending on bias etc.) have gains in the 20dB ballpark.
It seems to me that unless the TA4107F was readily available, that it would probably be placed in the footnotes that menti6006 2011-04-03 05:47:45 Lasse Re: Another Mixer Sounds like a SL6440 to me. It had 0,5 dB loss if terminated directly
into 50 ohms, and with 4:1 transformer on in and output you would have
some gain.
But this is truely made out of unobtanium :D As all of the Plessey IC's.
If you happens to find one it'll cost arm+leg and then some
/Lasse SM5GLC
Tim skrev 2011-04-03 14:19:
> > From the datasheets I was able to find, it's a Gilbert cell biased for low voltage (4.5V Vcc - I think they're clever in the bias network) and quite highish currents (32mA) meaning impedances in the hundred-ohm ballpark. i.e. an excellent choice for Transmit mixer.
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> I'm not sure what a "-0.5dB loss" number means in context of an active part that would usually have a gain? Maybe some mixer figure of merit that I'm unfamiliar with. For comparison, MC1496 and NE602 will (depending on bias etc.) have gains in the 20dB ballpark.
>
> It seems to me that unless the TA4107F was readily available, that it would probably be placed in the footnotes that menti6014 2011-04-03 14:03:42 kb1gmx Re: Another Mixer 6016 2011-04-03 17:14:12 ehydra Re: Another Mixer One have to define a metrik to compare things! For power consumption,
board area, price or even simplicity, or simple I/O for already defined
parts like the Si570.
All other is a waste of time!
So, compare the DBM to AD833. What is better if the FOM is measured at
equal power consumption? For the DBM you need to include the LO driver
and diplexers.
- Henry
--
ehydra.dyndns.info
kb1gmx schrieb:
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