Electronics > Projects, Designs, and Technical Stuff

Simple single-supply, negative ramp/sawtooth generator idea?

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ogden:
You can get reasonably linear capacitor charging curve using simple current mirror.

T3sl4co1l:
I would probably go for a diode from the FPGA output pin, to a cap, with a CCS to discharge it.  The Miller integrator is a close 2nd.  Add buffers as needed, say to improve ratings, or rise time (FPGA pins tend to be weak, or may be adequate electrical strength but not rated for the kind of repetitive current or C-load this application would have), and to buffer the output (so you don't have to worry about load resistance on the output changing the time constant).

Tim

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