Chopper Op Amps—are they really noisy?

RE: Chopper Op Amps—are they really noisy?

Bruce Trump — Wed, 04 Jun 2014 02:52:07 GMT

He-- Op amps from TI that use the technology discussed in this blog include OPA333, OPA330, OPA378 and OPA188. These products also have dual versions that are shown on the same data sheet as the single version. -- Bruce

RE: Chopper Op Amps—are they really noisy?

Xu-yang He — Wed, 04 Jun 2014 02:20:09 GMT

Mr. trump, is TI or BB offering any integrated chopper op amps you mentioned? Not the auto-zero ones like TLC2652 or TLC2654.Thank you!

RE: Chopper Op Amps—are they really noisy?

Bruce Trump — Thu, 16 May 2013 15:24:38 GMT

Ori-san— Agreed, the diagram of the 25-year-old TLC2654 shows what we would now call an auto-zero-type topology. This technique periodically shorts the input of a correction amplifier, storing its output offset on capacitors (external capacitors, in this case), then subtracts the offset from the active signal path in the next cycle of the clock. The term “chopper” has been used somewhat casually through the years to describe a variety of clocked zeroing techniques. It’s not entirely clear whether the author of this old data sheet made a mistake, or perhaps the terminology has gained greater clarity over the years. — Bruce

RE: Chopper Op Amps—are they really noisy?

Orikasa — Thu, 16 May 2013 06:36:56 GMT

Bruce-san, I am a little confused about technical term "Chopper" because TLC2654 seems "Chopper" by its datasheet, however, it looks "auto-zero". Which is true ?