Title:
SWITCHED CAPACITOR FILTER
Document Type and Number:
Japanese Patent JPS5799816
Kind Code:
A
Abstract:
PURPOSE: To obtain an optional filter characteristic easily by an external resistance or capacitor, by connecting a voltage dividing means to a capacitor for samping a signal charge to apply a divided voltage.
CONSTITUTION: A phase inverting integrator consists of resistances R1 and R2, switches S1a and S1b, a sampling capacitor CA1, an integrating capacitor CB1, and an operational amplifier OPA1. A voltage divided by resistances R1 and R2 is applied to the capacitor CA1. In this case, the resistance R2 is external, and the coefficient is set by selecting R1/R2. The external resistance R2 is made high by making the resistance R1 high not only to facilitate adjustment but also to reduce the loss.
Inventors:
KATOU SEIJI
UENO NORIO
TSUNOISHI MITSUO
UENO NORIO
TSUNOISHI MITSUO
Application Number:
JP17628380A
Publication Date:
June 21, 1982
Filing Date:
December 13, 1980
Export Citation:
Assignee:
FUJITSU LTD
International Classes:
H03H19/00; (IPC1-7): H03H19/00