Paul wrote:
post down conversion to 10 Khz I was scratching my head as to why not the TL08X series.
Input voltage noise. Unless you need the low input current of the FET part, there is no need to take the noise hit. If you *do* need the low input current, there are 4 or 5 generations of FET-input opamps that are all far superior to the TL0xx parts. Take a look at the OPA134/2134/4134, for example. (I haven't used TL0xx opamps since the '70s.)
BTW: I suggested using NE5532s instead of LM387s and said they were better in every way. Comparing the LM387 to the NE5532, one might notice that the bandwidth spec of the 5532 is lower (10MHz) than that of the 387 (15MHz). But what is important for most applications is not the small-signal BW, it is the power BW (full-output BW), which depends on the slew rate, not on the SSBW. The 5532's 9v/uS slew rate supports a PBW of 140kHz, while the 387's PBW is only 75kHz (S/R is not stated). (This tells us two things -- first, that the 387's slew rate must be <5v/uS; and second, that the 387 has less phase margin than the 5532.)
Best regards, Charles _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
