Continuous-time delta-sigma ADC with programmable input range

Details Continuous-time delta-sigma ADC with programmable input range Continuous-time delta-sigma ADC with programmable input range

2005-12-13

2005-12-13

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S069000

Reexamination Certificate

active

06975259

ABSTRACT:
A scaled input current is produced that substantially matches the full scale input of a CTΔτADC that substantially cancels an offset bias current component of the input current. A variable bias resistance value is coupled between the integrator input and one of a supply voltage and a circuit common. The method further includes integrating the input current to produce an integrated signal representing a time averaged value of the input current to substantially remove noise from a frequency band of interest. The integrated signal is produced to a quantizer to produce a feedback current that substantially cancels a quantization noise component in the digital representation of the scaled analog signal by coupling the digital representation of the scaled analog signal to a programmable digital switch wherein the programmable digital switch either sinks current from or sources current to the integrator input.

REFERENCES:
patent: 6184812 (2001-02-01), Younis et al.
patent: 6362762 (2002-03-01), Jensen et al.
patent: 6437718 (2002-08-01), Oyama et al.
patent: 6462687 (2002-10-01), Eshraghi et al.

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