Digital dynamic filtering and beat frequency reduction for...

Details Digital dynamic filtering and beat frequency reduction for... Digital dynamic filtering and beat frequency reduction for...

2007-02-13

2007-02-13

Wachsman, Hal (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C702S060000, C702S075000, C702S079000, C702S190000, C324S076440

Reexamination Certificate

active

11091289

ABSTRACT:
A power metering apparatus meters a power signal in a powered system. A low-pass filter receives the power signal and outputs a filtered signal. The filter implements a corner frequency programmable based on a first clocking signal and anti-aliases high frequency components of the power signal. An A/D converter receives the filtered signal and outputs a digital signal. The A/D converter samples the filtered signal according to a system clock based on a second clocking signal. A clocking element generates and outputs each of the first clocking signal and the second clocking signal. The first clocking signal is synchronous with the second clocking signal.

REFERENCES:
patent: 4642563 (1987-02-01), McEachern et al.
patent: 2004/0181718 (2004-09-01), Long
patent: 2005/0055586 (2005-03-01), Flen et al.
Dallas Semiconductor Maxim DS1077L, 3V EconOscillator/Divider, 20 pages, no date.
Maxim 5th-Order, Lowpass, Switched-Capacitor Filters, MAX7418-MAX7425, 14 pages, Maxim Integrated Products, Sunnyvale, California, no date.
Burr-Brown Products from Instruments, ADS8364, 250kHz, 16-Bit, 6-Channel Simultaneous Sampling Analog-to-Digital Converters, 23 pages, Texas Instruments, Dallas, Texas, no date.

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