| Autor: | C. Andre T. Salama, Wei Yang |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Engineering
business.industry Dynamic range Bandwidth (signal processing) Electrical engineering Mixed-signal integrated circuit Delta-sigma modulation Chip Surfaces Coatings and Films CMOS Hardware_GENERAL Hardware and Architecture Signal Processing Hardware_INTEGRATEDCIRCUITS Electronic engineering Oversampling business Voltage |
| Zdroj: | Analog Integrated Circuits and Signal Processing. 26:191-204 |
| ISSN: | 0925-1030 |
| DOI: | 10.1023/a:1008306308935 |
| Popis: | Low-voltage low-power sigma-delta modulators provide a critical interface in portable mixed-signal electronic systems. This paper deals with the design and implementation of a low-voltage, low-power 2nd-order sigma-delta modulator operating from a single 1.8 V power supply using a conventional 3.3 V, double-poly, 0.35 μm CMOS process, based on fully-differential switched-capacitor techniques. All the circuit blocks are integrated on one chip, and the input common-mode voltage is set at mid-rail, resulting in low power dissipation, minimum off-chip components, and high efficiency, flexibility and compatibility. The design is useful for voice applications in personal communications systems supplied by two nickel-cadmium or alkaline batteries. The modulator exhibits a 15-bit dynamic range for a 7 kHz bandwidth, and a 14-bit dynamic range for a 20 kHz bandwidth at an oversampling frequency of 2.56 MHz. The peak SNDR reaches 62 dB. The complete 2nd-order modulator has a power dissipation of 0.99 mW, and occupies 0.31 mm2 die area excluding bonding pads. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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