Title :
A switched-current bandpass delta-sigma modulator
Author :
Pattamatta, S.V. ; Manapragada, Praveen ; Dalal, Vineet ; Schreier, Richard
Author_Institution :
Dept. of Electr. & Comput. Eng., Oregon State Univ., Corvallis, OR, USA
fDate :
30 May-2 Jun 1994
Abstract :
An eighth-order switched-current bandpass delta-sigma modulator is described. Simulations indicate that out 1.2 μm CMOS implementation will achieve a SNR of 90 dB in the band 10 MHz±150 KHz when clocked at 40 MHz. The modulator makes use of a switched-current resonator based on the N-path technique and the resonator employs regulated-cascode current-copiers to simultaneously achieve high speed and an immunity to transistor mismatch
Keywords :
CMOS integrated circuits; sigma-delta modulation; switched current circuits; 1.2 micron; 10 MHz; 40 MHz; CMOS; N-path technique; SNR; eighth-order switched-current bandpass delta-sigma modulator; high speed device; regulated-cascode current-copiers; simulation; switched-current resonator; transistor mismatch; Analog-digital conversion; Circuits; Clocks; Delta modulation; Delta-sigma modulation; Narrowband; Noise robustness; Noise shaping; Semiconductor device noise; Signal to noise ratio;
Conference_Titel :
Circuits and Systems, 1994. ISCAS '94., 1994 IEEE International Symposium on
Conference_Location :
London
Print_ISBN :
0-7803-1915-X
DOI :
10.1109/ISCAS.1994.409414
