Switched capacitor circuit for precision resistance

Details Switched capacitor circuit for precision resistance Switched capacitor circuit for precision resistance

1993-04-20

1994-03-08

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

350 9, 350 51, H03F 102

Patent

active

052931692

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.

REFERENCES:
patent: 4633223 (1986-12-01), Senderowicz
patent: 5134401 (1992-07-01), McCartney et al.
patent: 5136255 (1992-08-01), Fattaraso et al.
patent: 5142238 (1992-08-01), White
patent: 5177484 (1993-01-01), Bruckmann
patent: 5206602 (1993-04-01), Baumgartner et al.

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