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US 4,070,667 AGranted
Charge transfer analog-to-digital converter
AssigneeGeneral Electric Company
InventorCharles W. Eichelberger
Life of this patent
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Abstract
A charge transfer analog-to-digital converter is described wherein an analog signal is converted to a digital equivalent thereof in a structure suitable to be implemented in MOS form. A dual slope technique is employed wherein the digital output is the ratio between the input signal and a reference signal.
Claims18
An analog to digital converter comprising:
- a first charge storage location;
- means for establishing a first charge level in said first charge storage location;
- means for removing a first metered plurality of charge packets from said first charge storage location, the size of the charge packets in said first plurality of charge packets being proportional to the magnitude of a first input signal;
- means for adding a second metered plurality of charge packets to said first charge storage location, the size of the charge packets in said second plurality proportional to the magnitude of a first reference voltage;
- and
- means for detecting the presence of said first charge level in said first charge storage location and providing an output signal in response thereto;
- the ratio between the number of charge packets in said first plurality to the number of charge packets in said second plurality at the time of said output signal being equal to the ratio between said first reference voltage and the magnitude of said first input signal.
4 more elements
Dependencies are inferred from the claim text.