Embedded Systems Conference
Breaking News
Comments
Newest First | Oldest First | Threaded View
Patk0317
User Rank
Author
re: Using switched capacitors to create programmable analog logic blocks in mixed-signal designs
Patk0317   8/25/2010 10:08:22 PM
NO RATINGS
This is a great technology as far as it goes. Very useful for a great many applications. However in a fully switched capacitor system, the sampling rate etc. is limited by the noise created to the point where it can no longer be filtered out. This is somewhere between 800KhZ to 1MHz in PSoC 1 devices.

old account Frank Eory
User Rank
Author
re: Using switched capacitors to create programmable analog logic blocks in mixed-signal designs
old account Frank Eory   8/24/2010 9:05:28 PM
NO RATINGS
@Dr DSP, try to think of this as "analog DSP." I know that sounds awkward, but what I mean is it's a sampled data system, just like DSP, except it's not quantized. So the sampling theorem applies, and you have all the usual DSP concerns like avoiding aliasing and correcting for sin(x)/x distortion due to the zero-order hold. Since the MOS switches are not ideal, they do make a noise contribution, but it turns out that a switched-cap resistor generates the same noise voltage as a physical resistor of the same value.

DrFPGA
User Rank
Author
re: Using switched capacitors to create programmable analog logic blocks in mixed-signal designs
DrFPGA   8/24/2010 8:00:48 PM
NO RATINGS
Is there a maximum frequence limit to operation based on the need for the Caps to be driven by a clocked circuit? It might be in the article somewhere but I counldn't easily find it... Are there other limitations- power, noise, etc? So much clocking would have a few downsides I would think...

Sachin Gupta
User Rank
Author
re: Using switched capacitors to create programmable analog logic blocks in mixed-signal designs
Sachin Gupta   8/24/2010 2:28:02 AM
NO RATINGS
I believe this dream has come true. Check out specs of PSoC3 and PSoC5 devices.



Top Comments of the Week
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

March 28 is Arduino Day -- Break Out the Party Hats!
Max Maxfield
7 comments
Well, here's a bit of a conundrum. I just received an email from my chum David Ashton who hails from the "Unfinished Continent" Down Under. David's message was short and sweet; all he said ...

Bernard Cole

A Book For All Reasons
Bernard Cole
1 Comment
Robert Oshana's recent book "Software Engineering for Embedded Systems (Newnes/Elsevier)," written and edited with Mark Kraeling, is a 'book for all reasons.' At almost 1,200 pages, it ...

Martin Rowe

Leonard Nimoy, We'll Miss you
Martin Rowe
5 comments
Like many of you, I was saddened to hear the news of Leonard Nimoy's death. His Star Trek character Mr. Spock was an inspiration to many of us who entered technical fields.

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
16 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Radio
LATEST ARCHIVED BROADCAST
EE Times Senior Technical Editor Martin Rowe will interview EMC engineer Kenneth Wyatt.
Flash Poll