Embedded Systems Conference
Breaking News
Comments
Newest First | Oldest First | Threaded View
ReneCardenas
User Rank
Author
re: high-precision timer
ReneCardenas   10/27/2010 11:27:53 PM
NO RATINGS
SizWind, can you elaborate some more on the description of the pulse you are trying to measure. Sporadic vs. a given measurement frequency. I can think of several devices that have PWM/window comparison logic to resolve to hundreds if not tenths of pSec.

jeremybirch
User Rank
Author
re: high-precision timer
jeremybirch   10/14/2010 10:13:33 AM
NO RATINGS
How often do you require to make a measurement, how accurately, and at what cost and complexity? When you say 500ps is that plus and minus, and is that resolution or accuracy? What is the frequency of the signal you are measuring eg are the pulses only a few times 500ps wide or are they millions of ps wide? You could use discrete logic, but handling 2GHz signals on a board could be tricky - normally this level is hidden away inside chips. You might be able to use some form of programmable logic, but 2GHz is pretty fast for an FPGA. If you don't need to take measurements of every pulse, or not very frequently, you could even use analogue techniques eg charge a capacitor up while the pulse is high using one value of resistor, then count how long it takes you to discharge the capacitor again using a much higher value of resistor (the ratio of the resistors allowing for you to make the measurement over a lot longer period and hence use a much slower clock). Of course noise etc need to be taken into account. There are lots of clever variants of this, and they can potentially be used to measure things very accurately, at the expense of time.

IndusAutomation
User Rank
Author
re: high-precision timer
IndusAutomation   10/14/2010 8:56:25 AM
NO RATINGS
What is max. frequency?

Jagdish Bisawa
User Rank
Author
re: high-precision timer
Jagdish Bisawa   10/10/2010 4:57:37 PM
NO RATINGS
Hi, I am not all that experienced at high-speed hardware design, but an FPGA based solution might help u here. I don't think there are off-the-shelf products that can cater to your requirement.

SizWind
User Rank
Author
high-precision timer
SizWind   10/9/2010 3:38:02 AM
NO RATINGS
Hi, I am designing a board-level circuit to measure pulse width, in which I need a high-precision timer. I want to use a high-speed counter to implement the timer. Since the timer requires an accuracy of 500ps, this implies that the clock to the counter has to run at a frequency of 2GHz. Since I am not designing chip-level circuit, I would like to purchase such an external timer/counter which achieves such precision. Does Anyone have an idea what to buy? If such high precision timer is not easily available in the market, is there anyway I can solve the problem through other means? Thanks!



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 ...