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14 bit Sigma Delta modulator with multi bit feedback

: Mödl, S.; Hauer, H.; Mertens, A.; Eckardt, D.

Grünbacher, H.:
ESSCIRC '96. 22nd European Solid State Circuits Conference. Proceedings
Gif-sur-Yvette: Ed. Frontieres, 1996
ISBN: 2-86332-197-8
European Solid State Circuits Conference (ESSCIRC) <22, 1996, Neuachatel>
Fraunhofer IIS A ( IIS) ()
CMOS motor control; CMOS-Umrichtertechnik; continous differential integrator; control; current measurement; measurement; Messen; mixed signal ASIC; modulator; MSR; multi bit feedback; Multibit-Rückführung; pulse width modulation; Pulsweitenmodulation; PWM; Regeln; Sigma-Delta-ADC; Steuern; Strommeßverfahren

This paper presents a first order Sigma Delta Analog to Digital Converter for current measurement in motor controls. The converter consists of a time continuous differential integrator at the input with external capacitors and a four bit pulsewidth modulator in the feedback branch. Highly symmetrically switching inverters are used to couple the differential feedback signal back to the input of the converter. The circuit is implemented in a 1.2 mu m CMOS N-Well Process and requires 2 mm2 for the analog and digital parts of the modulator. Power consumption is about 20 mW. Measurements show the feasibility of this structure for a resolution of 14 bit.