Title :
A third-order ΣΔ modulator in 0.18 μm CMOS with calibrated mixed-mode integrators
Author :
Shim, Jae Hoon ; Kim, Beomsup
Author_Institution :
Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
Abstract :
A third-order EA modulator employing mixed-mode integrators has been designed and implemented in 0.18um CMOS process. Because the use of mixed-mode integrators allows a 12dB improvement in the dynamic range over conventional third-order architectures, the modulator can be driven with lower sampling frequency to achieve the same dynamic range. The modulator covers the dynamic range requirements of GSM and WCDMA applications with sampling frequencies of only 3.2MHz and 40MHz, respectively. The circuit occupies 0.7mm2 silicon area.
Keywords :
CMOS integrated circuits; integrating circuits; mixed analogue-digital integrated circuits; sigma-delta modulation; 0.18 μm CMOS; 0.18 micron; 3.2 MHz; 40 MHz; calibrated mixed-mode integrators; dynamic range; third-order ΣΔ modulator; Circuits; Delta modulation; Dynamic range; Feedback; Frequency; GSM; Multiaccess communication; Sampling methods; Stability; Transfer functions;
Conference_Titel :
VLSI Circuits, 2004. Digest of Technical Papers. 2004 Symposium on
Print_ISBN :
0-7803-8287-0
DOI :
10.1109/VLSIC.2004.1346510
