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US 5,400,028 AGranted
Charge summing digital to analog converter
AssigneeInternational Business Machines Corporation
InventorEugene S. Schlig
Life of this patent
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Abstract
A D/A converter which develops the analog output by summing binary-weighted packets of electrical charge. Charge metering techniques are used to generate and sum the charge packets. It is particularly suited to application in the data line driver circuits of thin-film transistor liquid crystal displays. Various embodiments use single or multiple charge packet generators, and the multiple version may generate the packets for the various bits simultaneously, For the highest speed, or else sequentially, for the largest voltage dynamic range.
Claims13
A digital to analog converter comprising:
- a storage capacitor;
- charge metering means for receiving for each bit of a digital signal, a voltage pulse of bit-equivalent amplitude wherein at least some of said voltage pulses are of differing amplitudes, and for generating for each bit of said digital signal a bit-equivalent electrical charge packet having a magnitude proportional to an analog value of said bit;
- and
- means for supplying said charge packets to said capacitor to produce on said capacitor a voltage proportional to the analog value of said digital signal.
1 more element
Dependencies are inferred from the claim text.