[sdiy] Chopper amps

[harrybissell]

Like it or not (I = ~not~) lower supply voltages will be a fact of
life.  Choppers are good for really low offset voltages, if you need
that.
imho you can get low enough without choppers..

H^) harry

Nicholas Gregorich wrote:
> 
> I attended a TI seminar on power electronics today but they were giving away a couple ADCs, a DAC, and a precision opamp.
> 
> Its the OPA333, a chopper amp.
> 
> http://focus.ti.com/docs/prod/folders/print/opa333.html#samples?DCMP=TI_Portal_Brand_Tracking&HQS=Other+OT+portal_bc_opa333
> 
> I didn't learn about choppers in school but it seems as though they compensate for offset voltages due to part mismatches, temperature drift, and time drift using some sort of clocked "sampling".
> 
> Are chopper amps used in synthesizers or other music or even audio gear?  The OPA333 is supposedly a new design that includes a notch filter to eliminate the chopper noise associated with older designs.
> 
> Unfortunately the part is specified for single supply 5V, so I don't think it is useful for SDIY application.
> 
> Anyhow, just excited to share about something I learned today (amongst a lot of DC to DC conversion) and see if its something found in the SDIY community (or even commercial products).
> 
> Nick