Title :
Mismatch-shaped pseudo-passive two-capacitor DAC
Author :
Steensgaard, Jesper ; Moon, Un-Ku ; Temes, Gabor C.
Author_Institution :
Tech. Univ., Lyngby, Denmark
Abstract :
A simple mismatch-shaping scheme is proposed for a two-capacitor DAC. Unlike in other mismatch-shaping systems, the shaped error is generated by direct filtering of a well-defined bounded signal, which can be generated as white noise. The operation is closely related to a specific digital interpolation filter, but arbitrary properties of the overall interpolation characteristic can be assured. Simulations indicate that the scheme can be used for the realization of DACs with 16-bit linearity and SNR performance, with only 0.1% capacitance accuracy. The DAC is pseudo-passive, i.e. an active element is required only to buffer the output signal. Hence, it is potentially a very low-power circuit, suitable for portable applications
Keywords :
capacitance; digital-analogue conversion; interpolation; low-power electronics; white noise; SNR performance; capacitance; digital interpolation filter; direct filtering; linearity; low-power circuit; mismatch-shaping scheme; portable applications; pseudo-passive two-capacitor DAC; shaped error; well-defined bounded signal; white noise; CMOS technology; Capacitors; Circuits; Clocks; Energy consumption; Interpolation; Linearity; Low pass filters; Moon; Signal generators;
Conference_Titel :
Low-Power Design, 1999. Proceedings. IEEE Alessandro Volta Memorial Workshop on
Conference_Location :
Como
Print_ISBN :
0-7695-0019-6
DOI :
10.1109/LPD.1999.750415
