Title :
A Fourth-Order ΣΔ Converter with Self-Tuning Continuous Time Noise Shaper
Author :
Redman-White, W. ; Durham, A M
Author_Institution :
Dept of Electronics and Computer Science, University of Southampton, UK; Philips Semiconductors, Southampton, UK
Abstract :
A fourth order monolithic ΣΔ converter is presented. The circuit avoids problems associated with switched capacitor samplers by using a completely continuous-time noise shaper. Integrated passive components are used, with a self-tuning circuit to make negligible the associated uncertainty in the time constants, which is a serious problem in such a high order design. The circuit is unconditionally stable and recovers immediately from gross overload without resetting integrators. The chip is fabricated in 1.6u CMOS, and operates from a single 5V supply.
Keywords :
Bandwidth; Capacitors; Circuit noise; Clocks; Frequency; Linearity; Noise shaping; Semiconductor device noise; Stability; Voltage;
Conference_Titel :
Solid-State Circuits Conference, 1991. ESSCIRC '91. Proceedings - Seventeenth European
Conference_Location :
Milan, Italy
