Multipliers

[Ahmad]

Hello all,
I am Ahmad. I am looking for multiplier chip which has multi input
signals ( multi multiplier in one chip) Does this chip exsit?

thanks

 

[Tim Wescott]

On Mon, 14 Apr 2008 01:09:19 -0700, Ahmad wrote:

Hello all,
I am Ahmad. I am looking for multiplier chip which has multi input
signals ( multi multiplier in one chip) Does this chip exsit?

thanks

Do you mean an analog multiplier? Probably not. Even when analog
multipliers were not rare they were pretty much two-input devices.

What are you trying to do? If you're working with signals that are not
screamingly fast then signal processing that involves multiplying signals
together is often best done digitally, at least these days.

--
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com

Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html

 

[whit3rd]

On Apr 14, 1:09 am, Ahmad <daqamseh2...@gmail.com> wrote:

I am Ahmad. I am looking for multiplier chip which has multi input
signals ( multi multiplier in one chip) Does this chip exsit?

Maybe not under the name 'multiplier', but you can use
matched transistors to convert current quantities to voltage
proportional to log(I), and then sum the voltages, scale
appropriately, and inverse-logarithm (i.e. exponentiate)
to make a result. An array of six identical transistors
would implement a five-factor product.

The transistors have to be at the same temperature, so
a common heatsink or a packaged multiple-transistor circuit
is preferred.