Analog RAM and D-FilpFlop?
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Analog RAM and D-FilpFlop?
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Davy
Guest
Posted: Mon Nov 21, 2005 9:35 am    Post subject: Analog RAM and D-FilpFlop? Reply with quote
Hi all,

We know that digital circuit use RAM and D-FF to store digital signal
values. Is there any "Analog" RAM and D-FF which can store analog
signal values?

I am curious to know if not, how to store analog signal values in
analog way?

Any suggestions will be appreciated!
Best regards,
Davy

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JeffM
Guest
Posted: Mon Nov 21, 2005 9:35 am    Post subject: Re: Analog RAM and D-FilpFlop? Reply with quote
Quote:
Is there any "Analog" RAM and D-FF
which can store analog signal values?
Davy

http://www.google.com/search?q=define:sample+and+hold
http://www.google.com/search?q=bucket-brigade-device
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PeteS
Guest
Posted: Mon Nov 21, 2005 9:35 am    Post subject: Re: Analog RAM and D-FilpFlop? Reply with quote
An 'analog' RAM is sometimes known as a sample and hold, but it doesn't
hold for very long.
Such circuits are usually used in front of an A-D, so the analog value
may be stored as a digital value.

It is possible to make an analog storage cell, but it's far easier to
use an A-D (in general, at least).

Cheers

Petes

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Pooh Bear
Guest
Posted: Mon Nov 21, 2005 5:24 pm    Post subject: Re: Analog RAM and D-FilpFlop? Reply with quote
Davy wrote:

Quote:
Hi all,

We know that digital circuit use RAM and D-FF to store digital signal
values. Is there any "Analog" RAM and D-FF which can store analog
signal values?

I am curious to know if not, how to store analog signal values in
analog way?

I'd suggest googling 'charge coupled device'. Once popular for audio
delays for example.

Graham
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John Larkin
Guest
Posted: Mon Nov 21, 2005 5:35 pm    Post subject: Re: Analog RAM and D-FilpFlop? Reply with quote
On 21 Nov 2005 00:31:45 -0800, "Davy" <zhushenli@gmail.com> wrote:

Quote:
Hi all,

We know that digital circuit use RAM and D-FF to store digital signal
values. Is there any "Analog" RAM and D-FF which can store analog
signal values?

I am curious to know if not, how to store analog signal values in
analog way?

Any suggestions will be appreciated!
Best regards,
Davy


Multilevel Flash memory stores multiple bits per cell by placing
variable amounts of charge on a floating mosfet gate. The charge level
sits there, essentially unchanged, for many years.

There is an equivalent voice storage technology that stores analog
samples in eeprom-type cells.

One of the first digital computers stored bits on discrete capacitors,
mounted on a rotating drum, accessed sequentially by brushes.

John
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JeffM
Guest
Posted: Mon Nov 21, 2005 5:35 pm    Post subject: Re: Analog RAM and D-FilpFlop? Reply with quote
Quote:
I'd suggest googling 'charge coupled device'.
Once popular for audio delays for example.
Graham (Pooh Bear)

I tried that before *bucket brigade*.
Everything I saw refers to cameras.
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Pooh Bear
Guest
Posted: Mon Nov 21, 2005 5:35 pm    Post subject: Re: Analog RAM and D-FilpFlop? Reply with quote
JeffM wrote:

Quote:
I'd suggest googling 'charge coupled device'.
Once popular for audio delays for example.
Graham (Pooh Bear)

I tried that before *bucket brigade*.
Everything I saw refers to cameras.

Check this out.

http://www.du.edu/~etuttle/electron/elect39.htm

You need to get creative to get the best out of google.

Graham
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Don Bowey
Guest
Posted: Mon Nov 21, 2005 5:35 pm    Post subject: Re: Analog RAM and D-FilpFlop? Reply with quote
On 11/21/05 12:31 AM, in article
1132561905.494052.44210@z14g2000cwz.googlegroups.com, "Davy"
<zhushenli@gmail.com> wrote:

Quote:
Hi all,

We know that digital circuit use RAM and D-FF to store digital signal
values. Is there any "Analog" RAM and D-FF which can store analog
signal values?

I am curious to know if not, how to store analog signal values in
analog way?

Any suggestions will be appreciated!
Best regards,
Davy



Google for 'digital bucket brigade'.

Don
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Lord Garth
Guest
Posted: Tue Nov 22, 2005 1:36 am    Post subject: Re: Analog RAM and D-FilpFlop? Reply with quote
"Davy" <zhushenli@gmail.com> wrote in message
news:1132561905.494052.44210@z14g2000cwz.googlegroups.com...
Quote:
Hi all,

We know that digital circuit use RAM and D-FF to store digital signal
values. Is there any "Analog" RAM and D-FF which can store analog
signal values?

I am curious to know if not, how to store analog signal values in
analog way?

Any suggestions will be appreciated!
Best regards,
Davy

That is the heart of the ISD recorder chips....
http://www.winbond-usa.com/mambo/content/view/36/14
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Pooh Bear
Guest
Posted: Tue Nov 22, 2005 1:36 am    Post subject: Re: Analog RAM and D-FilpFlop? Reply with quote
John Larkin wrote:

Quote:
On 21 Nov 2005 00:31:45 -0800, "Davy" <zhushenli@gmail.com> wrote:

Hi all,

We know that digital circuit use RAM and D-FF to store digital signal
values. Is there any "Analog" RAM and D-FF which can store analog
signal values?

I am curious to know if not, how to store analog signal values in
analog way?

Any suggestions will be appreciated!
Best regards,
Davy

Multilevel Flash memory stores multiple bits per cell by placing
variable amounts of charge on a floating mosfet gate. The charge level
sits there, essentially unchanged, for many years.

There is an equivalent voice storage technology that stores analog
samples in eeprom-type cells.

One of the first digital computers stored bits on discrete capacitors,
mounted on a rotating drum, accessed sequentially by brushes.

How about CRT storage methods ?

http://www.computer50.org/mark1/new.baby.html

Graham
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Pooh Bear
Guest
Posted: Tue Nov 22, 2005 9:35 am    Post subject: Re: Analog RAM and D-FilpFlop? Reply with quote
John Larkin wrote:

Quote:
On Tue, 22 Nov 2005 01:03:10 +0000, Pooh Bear
rabbitsfriendsandrelations@hotmail.com> wrote:



John Larkin wrote:

On 21 Nov 2005 00:31:45 -0800, "Davy" <zhushenli@gmail.com> wrote:

Hi all,

We know that digital circuit use RAM and D-FF to store digital signal
values. Is there any "Analog" RAM and D-FF which can store analog
signal values?

I am curious to know if not, how to store analog signal values in
analog way?

Any suggestions will be appreciated!
Best regards,
Davy

Multilevel Flash memory stores multiple bits per cell by placing
variable amounts of charge on a floating mosfet gate. The charge level
sits there, essentially unchanged, for many years.

There is an equivalent voice storage technology that stores analog
samples in eeprom-type cells.

One of the first digital computers stored bits on discrete capacitors,
mounted on a rotating drum, accessed sequentially by brushes.

How about CRT storage methods ?

http://www.computer50.org/mark1/new.baby.html

Graham

Nice ref.

On a more modern note, Intersil is making some very nice voltage
reference chips with no "reference" at all. They're essentially
silicon capacitors charged up to the desired voltage and buffered with
a cmos opamp. They factory calibrate them (by tunneling or something)
and ship! The voltage just hangs there sort of forever.

I was impressed.

http://www.intersil.com/data/fn/fn8142.pdf

John

That's astonishing !

Graham
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John Larkin
Guest
Posted: Tue Nov 22, 2005 9:35 am    Post subject: Re: Analog RAM and D-FilpFlop? Reply with quote
On Tue, 22 Nov 2005 01:03:10 +0000, Pooh Bear
<rabbitsfriendsandrelations@hotmail.com> wrote:

Quote:


John Larkin wrote:

On 21 Nov 2005 00:31:45 -0800, "Davy" <zhushenli@gmail.com> wrote:

Hi all,

We know that digital circuit use RAM and D-FF to store digital signal
values. Is there any "Analog" RAM and D-FF which can store analog
signal values?

I am curious to know if not, how to store analog signal values in
analog way?

Any suggestions will be appreciated!
Best regards,
Davy

Multilevel Flash memory stores multiple bits per cell by placing
variable amounts of charge on a floating mosfet gate. The charge level
sits there, essentially unchanged, for many years.

There is an equivalent voice storage technology that stores analog
samples in eeprom-type cells.

One of the first digital computers stored bits on discrete capacitors,
mounted on a rotating drum, accessed sequentially by brushes.

How about CRT storage methods ?

http://www.computer50.org/mark1/new.baby.html

Graham


Nice ref.

On a more modern note, Intersil is making some very nice voltage
reference chips with no "reference" at all. They're essentially
silicon capacitors charged up to the desired voltage and buffered with
a cmos opamp. They factory calibrate them (by tunneling or something)
and ship! The voltage just hangs there sort of forever.

I was impressed.

http://www.intersil.com/data/fn/fn8142.pdf


John
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Jasen Betts
Guest
Posted: Tue Nov 22, 2005 9:35 am    Post subject: Re: Analog RAM and D-FilpFlop? Reply with quote
["Followup-To:" header set to sci.electronics.basics.]
On 2005-11-21, Davy <zhushenli@gmail.com> wrote:

Quote:
I am curious to know if not, how to store analog signal values in
analog way?

all I can think of is magnetic tape or a delay line

for most applications better precision can be had for less cost by converting to
digital.


--

Bye.
Jasen
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Joe G (Home)
Guest
Posted: Tue Nov 22, 2005 3:59 pm    Post subject: Re: Analog RAM and D-FilpFlop? Reply with quote
for analog NV-RAM.... ISD Winbond Audio chips.

ISD4004 etc

www.winbond.com

JG

"Davy" <zhushenli@gmail.com> wrote in message
news:1132561905.494052.44210@z14g2000cwz.googlegroups.com...
Quote:
Hi all,

We know that digital circuit use RAM and D-FF to store digital signal
values. Is there any "Analog" RAM and D-FF which can store analog
signal values?

I am curious to know if not, how to store analog signal values in
analog way?

Any suggestions will be appreciated!
Best regards,
Davy
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John Larkin
Guest
Posted: Tue Nov 22, 2005 5:35 pm    Post subject: Re: Analog RAM and D-FilpFlop? Reply with quote
On Tue, 22 Nov 2005 07:38:30 -0800, "Richard Henry" <rphenry@home.com>
wrote:


Quote:

Or ionizing radiation.



Sure. Xrays were used to erase the original eproms (three or four
times, then the silicon was destroyed.)

A rough calculation suggests the floating gate on the Intersil
reference leaks less than an electron per hour.

John
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