High-resolution A/D converters
High-resolution monolithic A/D converters are subject to growing interest due to the rapidly expanding market for digital signal processing systems. The introduction of digital audio recording equipment such as Super Audio Compact Disc (SACD) players requires resolutions from 16 to 24 bits. Monolithic converters with such a high linearity are difficult to design and require special circuit configurations. When a low conversion speed is needed, integrating types of converters can be used. In integrating types of highresolution A/D converters basically the analog input signal is converted into a time which is proportional to the input signal. Time is measured using a counter with an accurate clock. These systems are relatively slow because of the counting operation in the time-to-number conversion cycle. A speed improvement is obtained by using a coarse and fine conversion cycle in the time-to-number counting operation. A well-known analog-to-digital converter based on this system is the dual slope converter. This converter is mostly used in digital voltmeters.
KeywordsInput Signal Successive Approximation Operational Amplifier Reference Voltage Converter System
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