Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1988-11-21
1991-04-30
Scott, J. R.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341168, 341120, H03M 150, H03M 110
Patent
active
050122479
ABSTRACT:
The present invention provides a switched capacitor analog-to-digital converter for the sampling of an analog input signal and conversion to an equivalent digital format utilizing a multi-slope conversion technique. The elements comprising the converter are, preferably, integrated onto a single chip using CMOS technology. The converter includes a processor for coordinating switching in the converter and generating the digital output signal. A sampling circuit having a switched capacitor controlled by the processor is included in the converter for sampling the voltage of the analog input signal and transferring charge representative of the analog input signal between an integrator and the sampling circuit. Further included in the converter is a discharge circuit for either transferring charge to the integrator or receiving charge from the integrator. The discharge circuit is comprised of a number of switched capacitors having capacitances that are powers of two relative to one another to provide binary-weighted transfers between the discharge circuit and the integrator. Further, the processor can control, by using the switches, the direction of charge transfer using a single reference voltage. Further, the converter provides an autocalibration feature which compensates for deviation in the binary ratio of capacitances of the switched capacitors employed in the discharge circuit.
REFERENCES:
patent: 4144526 (1979-03-01), Wotruba
patent: 4357600 (1982-11-01), Ressmeyer et al.
patent: 4529965 (1985-07-01), Lee
patent: 4764753 (1988-08-01), Yukawa
patent: 4907002 (1990-03-01), Kawada
patent: 4908620 (1990-03-01), Fujisawa
patent: 4922252 (1990-05-01), Draxelmayr et al.
Hewlett--Packard Company
Logan Sharon D.
Scott J. R.
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