Message	Date	From	Subject
1608	2008-04-27 12:10:07	Rick	Op-Amp space constraints
I don't know of a quad 5532. I've used several different quad op-amps, but for last decade or so I've been taking advantage of the layout flexibility of parts with fewer leads. I find that I can often make a more compact layout using a pair of dual op-amps than a quad package with long traces running away to all the necessary off-chip parts. The additional control over physical and electrical separation of input and output stages is also helpful. I am not a fan of putting too many functions in a single IC package. If compact layouts are the goal--surface mount parts are the way to go. Wes has some nice examples of ugly style construction using surface mount parts on his web page. One of the difficulties in technology education is passing on useful local knowledge from one generation to the next. The first generation to use a new technology discovers all sorts on interesting behavior, and often writes about it. But later generations, including book authors, may not have the same depth of understanding. While developing the phasing receivers and transmitters for EMRFD I studied everything I could find on the subject from the 1950s when HF SSB was a current research topic for everyone from amateurs to professional engineers and college professors. I am humbled by the depth of understanding of fundamental signal processing concepts and subtle circuit behavior represented in those old papers. An important function of books like EMRFD, the ARRL Handbook, and web sites like this one is to pass along information from one generation to the next. Thank you for the opportunity to discuss the selection of op-amps. Rick KK7B
1610	2008-04-27 20:29:01	Frank	Passing the torch - or making sure it's well settled, even

1615	2008-04-28 07:05:32	Paul	Re: Op-Amp space constraints

1616	2008-04-28 07:05:35	ehydra	Re: Op-Amp space constraints
To my knowledge there don't exists a quad 5532. And the 5534 is sligthy different to 5532. The old LF357 is another good one. - Henry Rick schrieb: > I don't know of a quad 5532. I've used several different quad op-amps, but for last > decade or so I've been taking advantage of the layout flexibility of parts with fewer leads. > I find that I can often make a more compact layout using a pair of dual op-amps than a > quad package with long traces running away to all the necessary off-chip parts. The > additional control over physical and electrical separation of input and output stages is also > helpful. I am not a fan of putting too many functions in a single IC package. > > If compact layouts are the goal--surface mount parts are the way to go. Wes has some > nice examples of ugly style construction using surface mount parts on his web page. > > One of the difficulties in technology education is passing on useful local knowledge from > one generation to the next. The first generation to use a new technology discovers all > sorts on interesting behavior, and often writes about it. But later generations, including > book authors, may not have the same depth of understanding. > > While developing the phasing receivers and transmitters for EMRFD I studied everything I > could find on the subject from the 1950s when HF SSB was a current research topic for > everyone from amateurs to professional engineers and college professors. I am humbled > by the depth of understanding of fundamental signal processing concepts and subtle > circuit behavior represented in those old papers. > > An important function of books like EMRFD, the ARRL Handbook, and web sites like this > one is to pass along information from one generation to the next. Thank you for the > opportunity to discuss the selection of op-amps. > > Rick KK7B > > > ------------------------------------ > > Yahoo! Groups Links > > > >

Message

Date

From

Subject

1608

2008-04-27 12:10:07

Rick

Op-Amp space constraints

I don't know of a quad 5532. I've used several different quad op-amps, but for last
decade or so I've been taking advantage of the layout flexibility of parts with fewer leads.
I find that I can often make a more compact layout using a pair of dual op-amps than a
quad package with long traces running away to all the necessary off-chip parts. The
additional control over physical and electrical separation of input and output stages is also
helpful. I am not a fan of putting too many functions in a single IC package.

If compact layouts are the goal--surface mount parts are the way to go. Wes has some
nice examples of ugly style construction using surface mount parts on his web page.

One of the difficulties in technology education is passing on useful local knowledge from
one generation to the next. The first generation to use a new technology discovers all
sorts on interesting behavior, and often writes about it. But later generations, including
book authors, may not have the same depth of understanding.

While developing the phasing receivers and transmitters for EMRFD I studied everything I
could find on the subject from the 1950s when HF SSB was a current research topic for
everyone from amateurs to professional engineers and college professors. I am humbled
by the depth of understanding of fundamental signal processing concepts and subtle
circuit behavior represented in those old papers.

An important function of books like EMRFD, the ARRL Handbook, and web sites like this
one is to pass along information from one generation to the next. Thank you for the
opportunity to discuss the selection of op-amps.

Rick KK7B

1610

2008-04-27 20:29:01

Frank

Passing the torch - or making sure it's well settled, even

1615

2008-04-28 07:05:32

Paul

Re: Op-Amp space constraints

1616

2008-04-28 07:05:35

ehydra

Re: Op-Amp space constraints

To my knowledge there don't exists a quad 5532. And the 5534 is sligthy
different to 5532. The old LF357 is another good one.

- Henry

Rick schrieb:

> I don't know of a quad 5532. I've used several different quad op-amps, but for last
> decade or so I've been taking advantage of the layout flexibility of parts with fewer leads.
> I find that I can often make a more compact layout using a pair of dual op-amps than a
> quad package with long traces running away to all the necessary off-chip parts. The
> additional control over physical and electrical separation of input and output stages is also
> helpful. I am not a fan of putting too many functions in a single IC package.
>
> If compact layouts are the goal--surface mount parts are the way to go. Wes has some
> nice examples of ugly style construction using surface mount parts on his web page.
>
> One of the difficulties in technology education is passing on useful local knowledge from
> one generation to the next. The first generation to use a new technology discovers all
> sorts on interesting behavior, and often writes about it. But later generations, including
> book authors, may not have the same depth of understanding.
>
> While developing the phasing receivers and transmitters for EMRFD I studied everything I
> could find on the subject from the 1950s when HF SSB was a current research topic for
> everyone from amateurs to professional engineers and college professors. I am humbled
> by the depth of understanding of fundamental signal processing concepts and subtle
> circuit behavior represented in those old papers.
>
> An important function of books like EMRFD, the ARRL Handbook, and web sites like this
> one is to pass along information from one generation to the next. Thank you for the
> opportunity to discuss the selection of op-amps.
>
> Rick KK7B
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>