Method for generating filtered noise signal and broadband...

Details Method for generating filtered noise signal and broadband... Method for generating filtered noise signal and broadband...

H - Electricity

01

J

H01J 49/26 (2006.01) H01J 49/42 (2006.01)

Patent

CA 2141326

A method for generating a filtered noise signal, which includes the steps of generating a broadband signal having opti- mized (reduced or minimized) dynamic range, and filtering the broadband signal in a notch filter (35B) to generate a broadband signal whose frequency-amplitude spectrum has one or more notches. In preferred embodiments, the filtered noise signal is a vol- tage signal suitable for application to an ion trap (16) during a mass spectrometry operation. The invention enables rapid genera- tion of different filtered noise signals by filtering a single, optimized broadband signal using a set of different notch filters, each having a simple, easily implementable design. Digital values indicative of the amplitude, frequency, and phase of each sinusoidal (or other periodic) component of an optimized broadband signal can be iteratively generated by a digital computer in accordance with the invention, and the digital values can then be processed to generate an analog version of the optimized broadband signal.

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