Frank, The high cost is my concern, although high performance demands high price typically. I am trying to double the voltage reference from either an LM399 or LTZ1000, hence the need for precision matched resistors for a x2 non-inverting amplifier (using a LT1151 precision op amp). An alternative I am investigating is using the LTC1043 in a voltage doubling circuit as shown in Linear Technology app note AN 42, page 6, Figure 16. It states that Vout = 2xVin +/- 5 ppm. I am less concerned about the absolute accuracy than I am about the long term stability. I assume that a high quality capacitor is required (low leakage, low ESR, low dielectric absorbtion, etc.) but the circuit does not appear to be dependent on the absolute value of the capacitors. I'm not sure if the two 1uF caps need to be matched. If they do then that would be a show stopper.
Does anyone have any experience using the LTC1043 in such a circuit? Thanks, Randy On Wed, Jul 16, 2014 at 9:40 PM, Frank Stellmach <frank.stellm...@freenet.de > wrote: > Randy, > > resistor matched in T.C. are extremely expensive, as the manufacturer (or > yourself) would have to select these from a batch of many samples. > > reistors with very small T.C. (<1ppm/K) would do the job also, but they > also need to be stable over time, in shelf life opereation mode, i.e. > P<10mW. > > That means, you need those hermetically sealed VHP202Z from Vishay, T.C. > is typically < 1ppm/K and they are stable to < 2ppm over 5years. But they > cost already 80€ each, depending on tolerance. > > I made a longterm observation of these and found these parameters > confirmed. > > Frank > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/volt-nuts > and follow the instructions there. > _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.