EMRFD Message Archive 13741

Message Date From Subject
13741 2017-03-30 18:50:16 swift_glen OPA860 as a mixer?

It doesn't LOOK like a mixer, but such an operational-transconductance-amplifier (OTA) could be

used as one (it looks plenty fast enough, at least for HF use). Has anyone tried it in this application? Am curious to see what IP3 is achievable, and how much noise figure for a receiver front end. On my parts-list  for next mail-order. An interesting device, also might be used as a nice modulator. Certainly doesn't need much biasing. It is odd to see TI describe it as an ideal "transistor". Pushing AND pulling "collector" current takes some getting used to.

13742 2017-03-31 12:50:49 E-P Mänd VS: [emrfd] OPA860 as a mixer?
Hello all, LM3080 and alike 2-quadrant multipliers have been used as mixer, up to 10.7 MHz thoug its slew rate is only 50 V / microseconds, corresponding only abt. 0.8 MHz full-power bandwidth. Less gain at HF but works, as large gain is not needed. OTAs are flexible as mixers or modulators! – EePee, OH2NFI.



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Lähetetty: 31. maaliskuuta 2017 04:50
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Aihe: [emrfd] OPA860 as a mixer?





It doesn't LOOK like a mixer, but such an operational-transconductance-amplifier (OTA) could be

used as one (it looks plenty fast enough, at least for HF use). Has anyone tried it in this application? Am curious to see what IP3 is achievable, and how much noise figure for a receiver front end. On my parts-list for next mail-order. An interesting device, also might be used as a nice modulator. Certainly doesn't need much biasing. It is odd to see TI describe it as an ideal "transistor". Pushing AND pulling "collector" current takes some getting used to.





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