Analog to digital converter with autoranging offset

Details Analog to digital converter with autoranging offset Analog to digital converter with autoranging offset

1993-04-26

1994-07-12

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Nonlinear

341110, 341118, H03M 106

Patent

active

053292812

ABSTRACT:
A mixed analog and digital integrated circuit with features which are especially useful for application as a front end for physiological signal instrumentation such as electrocardiographs, electromyographs, and electroencephalographs. The integrated circuit has 5 signal channels, each with analog amplification and analog to digital conversion. The channels can be configured for various combinations of input signal amplification, input signal summation, analog output driving, and AC impedance measurement. The integrated circuit has 2 digital serial input lines and 2 digital serial output lines, all designed for direct connection to optical couplers. Channel configuration, gain, and other parameters are externally controllable by a serial digital input signal. Up to 6 compatible devices can be serially connected in a chain.

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Mike Rebeschini et al, A 16-b 160-kHz CMOS A/D Converter Using Sigma-Delta Modulation, Apr. 1990, IEEE Journal of Solid State Circuits, pp. 431-440.
Christopher Eichenberger and Walter Guggenbuhl, On Charge Injection In Analog MOS Switches and Dummy Switch Compensation Techniques, Feb. 1990, IEEE Transactions on Circuits and Systems, pp. 256-264.

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