Differential Cascode Current Switch Direct Analog-To-Digital Converter
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
The method described uses differential cascode current switch (DCCS) technology to provide conversion of analog data into digital format. Of significance is the utilization of differential pair cells to perform the conversion function. The output of this direct analog-to- digital converter has the advantage of being time independent to produce digital signals that can be clocked either synchronously or asynchronously. Although there have been circuit chips designed to combine analog and digital data processing by designating a portion of the chip to handle the analog processing and leaving the rest of the chip to process the digital portion, this design integrates the analog data handling so that it can be placed anywhere on the chips. The analog input voltage (Vin), as shown in Fig.