Plural channel analog-to-digital converter, method and meter...

Details Plural channel analog-to-digital converter, method and meter... Plural channel analog-to-digital converter, method and meter...

2005-06-14

2005-06-14

Jeanpierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

Reexamination Certificate

active

06906655

ABSTRACT:
A meter for power lines includes first input channels having AC signals with DC values of about zero. A second input channel has an analog output with a predetermined non-zero DC bias value. Plural biasing and scaling circuits input the AC signals and output corresponding analog outputs. Plural analog-to-digital converters input the corresponding analog outputs and output corresponding digital values. A serial output circuit serially communicates the corresponding digital values for a first set of A/D conversions before serially communicating digital values for a subsequent second set of conversions without providing any synchronization of the corresponding digital values for both the first and second sets of conversions. A serial input circuit serially receives the serially communicated digital values and saves the same in a memory. A processor averages the digital values for the channels and determines whether only the average associated with the second channel has the DC bias value.

REFERENCES:
patent: 5099239 (1992-03-01), Bruce et al.
Analog Devices, Inc., “Six-Input Channel Analog Front End”, AD73360L, 2000, pp. 1-32.

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