Patent ID: 9666156
Date: 2017-05-30
CPC Classifications: G09G,H03M

Claim:
1. A method of converting a M-bit digital input code to an analog output voltage, comprising the steps of: setting high and low reference voltages of high and low reference voltage nodes to selected levels depending on at least a portion of the M-bit digital input code; coupling a first capacitor between a first capacitor charging node and the low reference voltage input node; coupling a termination capacitor between a charge collection node and the low reference voltage input node; deriving a sequence of one-bit control codes from the M-bit digital input code; selectively coupling the first capacitor charging node to one of the low reference voltage input node and the high reference voltage input node during first capacitor charge cycles in response to instances of the one-bit control code from the sequence of one-bit control codes; and coupling the first capacitor charging node to the charge collection node during charge redistribution cycles that follow the first capacitor charge cycles to redistribute charge with the termination capacitor.