Re: Variable amplitude clock?
- From: John Fields <jfields@xxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 17 Mar 2008 18:20:17 -0500
On Mon, 17 Mar 2008 10:51:32 -0700 (PDT), jdhar <jai.dhar@xxxxxxxxx>
wrote:
I have a project where I need to design a clock circuit that has
variable amplitude (from ~1.2V - 3.3V). The input clock to this
variable gain stage would be 3.3V, but I have to be able to scale it
down to 1.2V if necessary. Digital control of the gain would be nice,
but not necessary. The clock would need to be ~50Mhz max.
Some options I was thinking of...
- Opamps/variable gain amplifiers come to mind, however, I don't think
they would work well with square waves - would they?
- I could maybe use discrete FETs and use an independent voltage
supply to the FETs that I can program digitally
- Using a high-speed DAC would be good, but I'm not sure if jitter
would be a problem here. WIth a DAC, I could control the high and low
levels precisely, which seems to be the best solution... rise and fall
time maybe an issue to.
Does anyone know how this is typically done with function generators
etc?
---
What does the variable clock have to drive?
.
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