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.



Radio
LATEST ARCHIVED BROADCAST
As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Like Us on Facebook
Special Video Section
The LTC®6363 is a low power, low noise, fully differential ...
Vincent Ching, applications engineer at Avago Technologies, ...
The LT®6375 is a unity-gain difference amplifier which ...
The LTC®4015 is a complete synchronous buck controller/ ...
10:35
The LTC®2983 measures a wide variety of temperature sensors ...
The LTC®3886 is a dual PolyPhase DC/DC synchronous ...
The LTC®2348-18 is an 18-bit, low noise 8-channel ...
The LT®3042 is a high performance low dropout linear ...
Chwan-Jye Foo (C.J Foo), product marketing manager for ...
The LT®3752/LT3752-1 are current mode PWM controllers ...
LED lighting is an important feature in today’s and future ...
Active balancing of series connected battery stacks exists ...
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 ...