Over-sampling analog-to-digital converter using a current switch

Details Over-sampling analog-to-digital converter using a current switch Over-sampling analog-to-digital converter using a current switch

1991-05-23

1993-07-13

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341143, H03M 150

Patent

active

052277950

ABSTRACT:
An over-sampling analog-to-digital converter using a current switching circuit 102 as a local digital-to-analog converter, wherein a difference between the output currents Isig and Iq of a voltage-to-current converter circuit 101 and a current switching circuit is integrated by a capacitor 105 of which the one end is grounded to a dc potential VB. Further, the current switching circuit 102 has many bits to decrease the difference current between the signal current Isig and the feedback current signal Iq. Moreover, the level-shifting function of the voltage-to-current converter circuit 101 makes it possible to apparently subtract the dc component from the input analog signal Vsig which is produced based on an internally generated dc voltage as a dc bias voltage, and to decrease a change in the voltage between the electrodes of a capacitor caused by the integration of current.

REFERENCES:
patent: 3624558 (1971-11-01), Brolin
patent: 3781685 (1973-12-01), Ching
patent: 4542354 (1985-09-01), Robinton et al.
patent: 4990914 (1991-02-01), Giancarlo
ISSCC 85, Feb. 13, 1985, Session VII: Data Converters, pp. 80-81.
ISSCC 86, Feb. 20, 1986, Session XIV: Voiceband Telecommuniations ICs, pp. 180-181.
IEEE Journal of Solid-State Circuits, vol. SC-21, No. 6, Dec., 1986, "A 12-bit Sigma-Delta Analog-to-Digital Converter with a 15-MHz Clock Rate", R. Koch et al, pp. 1003-1010.

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