Patent ID: 7227489
Filing Date: 2007-06-05
Classification: H03M

Abstract:
1. A method for converting an analog signal to a digital signal comprising the steps of: (a) passing the analog signal through a buffer amplifier to amplify the signal; (b) effecting low pass filtering of the analog signal in a low pass filter set to pass the highest signal frequency to be retained; (c) passing the filtered signal through a drive amplifier; (d) converting the analog signal to a digital signal at an analog to digital sampling rate higher than a highest desired sampling rate and such that the highest retained frequency in the sampled signal is above a cutoff frequency of the low pass filter; and (e) digital filtering in a digital filter and down sampling the digital signal, wherein a desired overall cutoff frequency is implemented by digital filtering during the digital filtering and down sampling step, the desired output sampling rate is implemented in the down sampling step, and the cutoff frequency of the digital filter is matched to the output rate of the down sampling step.