Title :
A 5th-order delta-sigma modulator with single-opamp resonator
Author :
Matsukawa, Kazuo ; Mitani, Yosuke ; Takayama, Masao ; Obata, Koji ; Dosho, Shiro ; Matsuzawa, Akira
Author_Institution :
Strategic Semiconductor Development Center, Panasonic Corporation, 3-1-1, Yagumo-Nakamachi, Moriguchi, Osaka, 570-8501, Japan
Abstract :
A new circuit configuration realizing 2nd-order resonator with one operational amplifier is applied to a 5th-order deltasigma (ΔΣ) modulator. The proposed resonator enables us to any kinds of 2nd-order transfer function, which means that the resonator can realize a single feedback modulator with feed forward compensation[1,2]. Collaborating with other two improved features of a kickback relaxation filter and a simple resistor adder, we fabricated the highly efficient 5th-order ΔΣ modulator with only three opamps, whose FOM was 0.24 pJ/conv.
Keywords :
Adders; Circuits; Collaboration; Delta modulation; Feedback; Feeds; Operational amplifiers; Resistors; Resonator filters; Transfer functions;
Conference_Titel :
VLSI Circuits, 2009 Symposium on
Conference_Location :
Kyoto, Japan
Print_ISBN :
978-1-4244-3307-0
Electronic_ISBN :
978-4-86348-001-8
