EMRFD Message Archive 679

Message Date From Subject
679 2007-05-01 10:17:26 Hari G Gain of MC1496
All,
 
 I would like to know how much is the gain of MC1496 when used as first mixer and as a product detector,  is this too much dependent on the resitor between pin 2 and 3 or is there some nominal value which i can use in my calculations for an overall Rx arrangement.

--
De Hari
VU2GHB
686 2007-05-01 16:15:28 Kevin Purcell Re: Gain of MC1496
As it mentioned in EMRFD the 1496 is just a Gilbert Cell mixer so if
you follow through the small amp gain circuit analysis ...

Or you can cheat and read the datasheet and application note where
the resistor between pin 2 and 3 (the emitters of the diff pair) sets
the gain along with pin 5 which sets the operating current (which
affects the gain by setting r_e):

<http://www.onsemi.com/pub/Collateral/MC1496-D.PDF>
<http://www.onsemi.com/pub/Collateral/AN531-D.PDF>

Actually this application note is a nice supplement to EMRFD on
Gilbert Cell mixers.

BTW, I see that On Semiconductor is making the 1496 still?

<http://www.onsemi.com/PowerSolutions/product.do?id=MC1496>

In SMT packing too (though they still have a 14 pin DIP). I would
have thought this would be EOLed by now and joined the 40673 as the
device from the 1970s we fondly remember.

73
Kevin
N7WIM

688 2007-05-01 18:09:49 Roy J. Tellason Re: Gain of MC1496
On Tuesday 01 May 2007 13:17, Hari G wrote:
> All,
>
> I would like to know how much is the gain of MC1496 when used as first
> mixer and as a product detector, is this too much dependent on the resitor
> between pin 2 and 3 or is there some nominal value which i can use in my
> calculations for an overall Rx arrangement.

I'm not that familiar with the part, but you can find a datasheet for it
here:

http://www.classiccmp.org/rtellason/by-mfr-number.html

if that'll help.

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space,  a critter that can
be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
690 2007-05-01 18:51:06 Hari G Re: Gain of MC1496
Kevin /Roy ,
 
   Thanks for the pointers, i wanted them to calculate the gain of a Rx arrangement i will have  a look.
Iam using 14pin dip version in that. wiuth single conversion with 10.7Mhz IF.
 
 
Many thanks
 Hari (VU2GHB)
 
On 5/2/07, Kevin Purcell <kevinpurcell@pobox.com> wrote:

As it mentioned in EMRFD the 1496 is just a Gilbert Cell mixer so if
you follow through the small amp gain circuit analysis ...

Or you can cheat and read the datasheet and application note where
the resistor between pin 2 and 3 (the emitters of the diff pair) sets
the gain along with pin 5 which sets the operating current (which
affects the gain by setting r_e):

< http://www.onsemi.com/pub/Collateral/MC1496-D.PDF>
<http://www.onsemi.com/pub/Collateral/AN531-D.PDF >

Actually this application note is a nice supplement to EMRFD on
Gilbert Cell mixers.

BTW, I see that On Semiconductor is making the 1496 still?

< http://www.onsemi.com/PowerSolutions/product.do?id=MC1496>

In SMT packing too (though they still have a 14 pin DIP). I would
have thought this would be EOLed by now and joined the 40673 as the
device from the 1970s we fondly remember.

73
Kevin
N7WIM



693 2007-05-02 05:59:09 topossibilities Re: Gain of MC1496
I've used the MC1496G (10 pin round can package) in many designs and
perfer it over the NE/SA602. It's much better specified and flexible.

Although it requires a few more external parts, you can get the
operating parameters (e.g. current, gain, input and output impedances
for inter-stage matching). It's LO port drive requirements are easy too.

I used it for the Rx / Tx mixers, product detector and balanced
modulator in a 10W SSB transceiver that fit on a 4" x 5" PCB.

Ed, W1AAZ

Lots of books, parts, kits, test equipment for sale at:

http://mysite.verizon.net/topossibilities/
694 2007-05-02 20:05:21 Allison Parent Re: Gain of MC1496
721 2007-05-06 13:24:05 Kevin Purcell Re: Gain of MC1496
This is a bit long ...