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'[PICLIST] [HELP please]1us pulses and current gene'
2001\02\14@204953 by mike

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Hello,

I have been trying to come up with a design for
generating 1 us pulses, with PRF of 10kHz (1% duty
cycle) to control a DAC which in turn controls a the
current in a current source.

I have a design for a current source with DAC but its
continuous.

I am having trouble coming up with the right parts
for:

1. Being able to pulse the current source at the
required pulse width.

1. I want to be able to measure the current that is
flowing, somewhere within the 1us time frame. So I
need an a/d that fast enough, and also I need to
trigger it short time after the pulse starts.

3. To complicate it from a non technical side, the
cost has to be low.


I would appreciate it if any one could suggets which
parts would be useful, or perhaps you may already know
where there is a design that can be used.


Thanks.

Mike




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'[PIC]: [HELP please]1us pulses and current generat'
2001\02\14@210450 by Dan Michaels

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face
Mike wrote:
>Hello,
>
>I have been trying to come up with a design for
>generating 1 us pulses, with PRF of 10kHz (1% duty
>cycle) to control a DAC which in turn controls a the
>current in a current source.
>
........
>
>1. I want to be able to measure the current that is
>flowing, somewhere within the 1us time frame. So I
>need an a/d that fast enough, and also I need to
>trigger it short time after the pulse starts.
>

Mike, you might just be able to squeeze this sort of resolution
out of a PIC running at 20mhz [5 MIPS], but it would probably be
a lot easy using a scenix at 50mhz [50 MIPS].

The PIC is going to have trouble operating a 1Mhz A/D, but the
scenix could do it and sing a song on a 2nd DAC in the time between
samples.

best regards,
- dan michaels
http://www.oricomtech.com
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