Title :
A Full 12-Bit Switched-Current ΔΣ Modulator with Self-Calibration
Author :
Leme, C.Azeredo ; Silva, José B. ; Franca, J.E.
Author_Institution :
Instituto Superior Técnico, Centre for Microsystems, Av. Rovisco Pais, 1096 Lisboa Codex, PORTUGAL. Phone: +351-1-8418376, Fax: +351-1-8417675, email: carlos@ecsm4.ist.utl.pt
Abstract :
In this paper we present a differential switched-current delta-sigma modulator achieving full 12 bit resolution. A differential first generation based S2I cell is adopted for its superior linearity, while the use of an efficient self-calibrating technique minimizes integrator loss due to its poor transistor matching. Measurement results on a first-order prototype show a 74 dB signal-to-distortion ratio. The complete circuit occupies 0.25 mm2 of silicon area in a 0.8 μm DPSM CMOS process.
Keywords :
Calibration; Circuits; Clocks; Degradation; Delta modulation; Dynamic range; Linearity; Logic arrays; Modulation coding; Voltage;
Conference_Titel :
Solid-State Circuits Conference, 1996. ESSCIRC '96. Proceedings of the 22nd European
Conference_Location :
Neuchatel, Switzerland
Print_ISBN :
2-86332-197-8
