Title :
A 50-MHz continuous-time switched-current ΣΔ modulator
Author :
Luh, Louis ; Choma, John, Jr. ; Draper, Jeffrey
Author_Institution :
Dept. of Electr. Eng., Univ. of Southern California, Los Angeles, CA, USA
Abstract :
A new architecture of second-order continuous-time switched-current ΣΔ modulator is presented. A reference current generator is used in the second stage to solve the scaling problem. A novel current switch is designed to minimize the clock feedthrough problem and increase the operating speed. With a 50 MHz sampling rate, it has achieved 50 dB dynamic range (8-bit) at 1 MHz. This modulator has been fabricated in a 2 μm CMOS process with an active area of 0.37 mm2. The power dissipation is 15 mW
Keywords :
CMOS integrated circuits; circuit stability; continuous time systems; mixed analogue-digital integrated circuits; modulators; sigma-delta modulation; switched current circuits; 1 MHz; 15 mW; 2 micron; 5 V; 50 MHz; 8 bit; CMOS process; clock feedthrough problem; continuous-time SI ΣΔ modulator; current switch; reference current generator; second-order type; sigma-delta modulator; switched-current ΣΔ modulator; Circuit synthesis; Clocks; Delta modulation; Feedback loop; Flip-flops; Frequency; Linearity; MOS devices; Switches; Voltage;
Conference_Titel :
Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4455-3
DOI :
10.1109/ISCAS.1998.704578
