RESONATOR, DELTA-SIGMA MODULATOR, AND WIRELESS COMMUNICATION DEVICE

WIPO Patent Application WO/2011/089661

A1

Provided is a secondary resonator that is configured by using a single operational amplifier and that has reduced power consumption and easy-to-set transfer characteristics. The disclosed resonator includes: an operational amplifier (10); a T-shaped filter configured of two resistor elements (11, 12) and one capacitor element (23) and a T-shaped filter configured of two capacitor elements (21, 22) and one resistor element (13), the T-shaped filters being inserted in the negative feedback section of the operational amplifier; a resistor element (14) and a capacitor element (24) connected, respectively, between intermediate nodes (101, 102) and the signal input terminal; and a resistor element (15) and a capacitor element (25) connected in parallel between the signal input terminal and the inverting input terminal of the operational amplifier. In this configuration, the combined admittance for when the elements connected to the intermediate node (101) are connected in parallel is set to be equivalent to the combined admittance for when the elements connected to the intermediate node (102) are connected in parallel.

MITANI YOSUKE
MATSUKAWA KAZUO
TAKAYAMA MASAO
OBATA KOJI
DOSHO SHIRO

PCT/JP2010/004480

July 28, 2011

July 09, 2010

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PANASONIC CORP (JP)
MITANI YOSUKE
MATSUKAWA KAZUO
TAKAYAMA MASAO
OBATA KOJI
DOSHO SHIRO

H03H11/12; H03M3/02

WO2009133653A1	2009-11-05
WO2010038331A1	2010-04-08

JPS5388549A	1978-08-04
JPS62183209A	1987-08-11
JPS58500926A	1983-06-02

MAEDA, Hiroshi et al. (JP)
Hiroshi Maeda (JP)

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