Current sensing analog to digital converter and method of use

Details Current sensing analog to digital converter and method of use Current sensing analog to digital converter and method of use

2006-09-26

2006-09-26

Barnie, Rexford (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S143000, C320S128000, C320S132000, C702S064000

Reexamination Certificate

active

07113122

ABSTRACT:
A current sensing analog to digital converter (CS-ADC) is disclosed. The current sensing analog to digital converter comprises a modulator adapted to sense a change in current and generate an oversampled signal. The converter further includes a decimation filter system coupled to modulator for removing out of band noise from the signal and reduce the data rate to achieve a high resolution signal. A current sensing analog to digital converter (CS-ADC) is disclosed that samples the charge or discharge current flowing through an external sense resistor RSENSE. The sample from the RSENSEis processed by a delta-sigma modulator which generates an over sampled noise shaped signal. From this signal a decimation filter system removes the out-of band noise and reduces the data rate to achieve a high-resolution signal. The CS-ADC also provides regular current detection. The regular current detection compares the data from conversion against charge/discharge threshold levels specified by the user. To save power a special mode where the user configures the regular current sampling interval is provided. This allows ultra-low power operation in power-save mode when small charge or discharge currents are flowing.

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