Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2006-07-11
2006-07-11
Wamsley, Patrick (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S143000, C327S337000
Reexamination Certificate
active
07075475
ABSTRACT:
A charge balancing modulation system for digitizing the output of a variable impedance sensor utilizes synchronous excitation of the input sensor and AC coupling of the analog input signal. In one embodiment, the modulation system includes a switched excitation source for exciting the input sensor and generating an input voltage step in response, and an integrator including an input capacitor, an amplifier and an accumulation capacitor. The input capacitor AC couples the input voltage step to the integrator to form an input charge. A reference charge packet is generated in a data dependent manner and coupled to the integrator simultaneously with the input charge. The integrator integrates charge associated with the sum of the input charge and the reference charge, when applied. The modulation system generates an output data stream exhibiting a ones density proportional to the magnitude of the average input voltage step.
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Cook Carmen C.
National Semiconductor Corporation
Wamsley Patrick
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