Simple high resolution monolithic DAC for the tuning of an exter

Details Simple high resolution monolithic DAC for the tuning of an exter Simple high resolution monolithic DAC for the tuning of an exter

1997-01-21

1998-11-24

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341144, H03M 302

Patent

active

058413863

ABSTRACT:
This invention relates to a high-resolution digital/analogue converter intended in particular for the tuning of a voltage-controlled quartz oscillator. This converter comprises a first second-order Sigma-Delta modulator (1) to the output of which is connected the input of a second Sigma-Delta modulator (9) producing a single bit at its output and a digital/analogue conversion circuit (13). The circuit of the converter furthermore comprises means for filtering the high-frequency components of the signal undergoing processing so as to obtain a quasi-stable D.C. voltage source with a high resolution.
This invention is applicable to any voltage-controlled system having large inertia, and in particular, voltage-controlled quartz oscillators and transducers.

REFERENCES:
patent: 5323157 (1994-06-01), Ledzius et al.
Louis A. Williams, Third-Order Cascaded Sigma-Delta Modulators, IEEE Transactions on Circuits and Systems,vol. 38, No. 5, pp. 489-498, May 1991 .

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