Title :
A 12-bit@40MS/s Gm-C Cascade 3-2 Continuous-Time Sigma-Delta Modulator
Author :
Tortosa, Ramón ; Aceituno, Antonio ; De la Rosa, José M. ; Rodríguez-Vazquez, Angel ; Fernández, Francisco V.
Author_Institution :
Inst. de Microelectron. de Sevilla, IMSE-CNM, Sevilla
Abstract :
This paper reports the transistor-level design of a 130-nm CMOS continuous-time cascade SigmaDeltamodulator. The modulator topology, directly synthesized in the continuous-time domain, consists of a third-order stage followed by a second-order stage, both realized using Gm-C integrators and a 4-bit internal quantizer. Dynamic element matching is included to compensate for the non-linearity of the feedback digital-to-analog converters. The estimated power consumption is 70 mW from a 1.2-V supply voltage when is clocked at 240MHz. CADENCE-SPECTRE simulations show 12-bit effective resolution within a 20-MHz signal bandwidth.
Keywords :
CMOS integrated circuits; continuous time systems; quantisation (signal); sigma-delta modulation; 1.2 V; 12 bit; 130 nm; 20 MHz; 240 MHz; 4 bit; 70 mW; CMOS technology; Gm-C integrators; continuous-time sigma-delta modulator; digital-to-analog converters; dynamic element matching; internal quantizer; Bandwidth; Circuit simulation; Clocks; Delta-sigma modulation; Energy consumption; Latches; Signal resolution; Topology; Transconductors; Voltage;
Conference_Titel :
Circuits and Systems, 2007. ISCAS 2007. IEEE International Symposium on
Conference_Location :
New Orleans, LA
Print_ISBN :
1-4244-0920-9
Electronic_ISBN :
1-4244-0921-7
DOI :
10.1109/ISCAS.2007.378128
