Magnus Danielson wrote:
Bruce Griffiths wrote:
Active mixers almost invariably have a higher noise floor than
passive mixers, particularly in the flicker noise region.
Consequently a DMTD system using active mixers will have a higher
system noise floor than one using active mixers.
... than one using passive mixers.
You still need driving amplifiers.
Cheers,
Magnus
Its much easier to ensure that the flicker phase noise of a buffer
amplifier is low than it is to achieve a low flicker phase noise for an
mixer using nonlinear active devices.
Even passive FET mixers have higher flicker noise than passive mixers
using schottky diodes.
Bruce
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