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Case-Study Case-Study, RF, DSP, Signal Processing Case-Study RF DDC NCO CIC CORDIC DSP

Digital Down-Conversion: bringing a carrier to baseband without analog mixers

A large family of measurements does not deliver its information at DC. It arrives riding on a carrier: the free induction decay of an NMR or EPR experiment, the response of a resonant sensor driven at its resonance, the return of a swept optical or acoustic interrogator, the output of an RF front end.

A lock-in amplifier that lives entirely in the FPGA

A lock-in amplifier is the standard answer to one specific problem: you have a signal you can modulate, and it is far smaller than the noise sitting on top of it.

Watching a handful of frequencies without paying for an FFT

Electrochemical impedance spectroscopy measures a cell at a dozen or so discrete frequencies. A resonant sensor is interrogated at its resonance and at two points on the skirt.

Tag: RF

Digital Down-Conversion: bringing a carrier to baseband without analog mixers

A lock-in amplifier that lives entirely in the FPGA

Watching a handful of frequencies without paying for an FFT