Re: How could measure the trigger position in the 100MHz sqaure wave

From: Rich Grise (rich_at_example.net)
Date: 10/21/04 

Date: Thu, 21 Oct 2004 06:50:27 GMT

On Wed, 20 Oct 2004 21:01:13 -0700, Fox zhou wrote:

> As shown in the following chart, there is a trigger signal (a pulse)
> may occur at any time in the cycle of a 100MHz square wave (10ns
> period, 50% duty cycle). I want to measure the delay time between the
> rising edge of the square wave and the trigger falling edge. (t marked
> in the chart).
>
>
> |t|
> --------__________
>
> ______-----_____-----_____
> |<-10ns-->|
> | 1 cycle |
>
> I'd like to hear any ideas from you to solve this problem.
>
> I'm trying to use the logic gate to capture this interval and charge
> the capacitor this period of time. Then the elapsed time is recorded
> in the capacitor a voltage. But it seems difficult to acquire the
> logic and control the charging and discharging. Do you have a
>
>
> Chart: [missing]

Just use a Tektronix scope with at B sweep.

Cheers!
Rich