JPS55123226A - Switched capacitor filter - Google Patents
Switched capacitor filterInfo
- Publication number
- JPS55123226A JPS55123226A JP3072779A JP3072779A JPS55123226A JP S55123226 A JPS55123226 A JP S55123226A JP 3072779 A JP3072779 A JP 3072779A JP 3072779 A JP3072779 A JP 3072779A JP S55123226 A JPS55123226 A JP S55123226A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- amplifier
- filter
- capacitors
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H19/00—Networks using time-varying elements, e.g. N-path filters
- H03H19/004—Switched capacitor networks
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Filters That Use Time-Delay Elements (AREA)
Abstract
PURPOSE:To obtain a variable-constant filter block suitable to IC-implementation with good mass-producibility by providing a control part which changes filter characteristics by setting the switching period of each switching element. CONSTITUTION:Switches S and capacitors C constitute switched capacitors S1C1'', S2C1', S5C2''', S3C2'', S4C2', S7C3', and S8C0', and operational amplifiers OP1-OP4, integral capacitors C0-C3 connected across them, and resetting switches S6 and S9 constitute a switched capacitor filter. Amplifier OP1 holds voltage V1' N5C0'/ C0 times input voltage Vi until S9 is shorted. Amplifiers OP2 and OP3 are applied with voltage V1' by way of S1C1' and S3C2'' and output voltage V0 via S2C1' and S2C2' respectively, and amplifier OP3 with the output of OP1 via S5C2''', so that the voltages will be integrated by C1 and C2 respectively. Amplifier OP4 is applied with the output of OP3 and voltage V1' and holds the sum voltage by integraing. Then, control circuit CNT exercises control by setting switching periods of S1-S9 to fixed values, so that a filter widh desired characteristics can be obtained.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3072779A JPS55123226A (en) | 1979-03-16 | 1979-03-16 | Switched capacitor filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3072779A JPS55123226A (en) | 1979-03-16 | 1979-03-16 | Switched capacitor filter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55123226A true JPS55123226A (en) | 1980-09-22 |
Family
ID=12311685
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3072779A Pending JPS55123226A (en) | 1979-03-16 | 1979-03-16 | Switched capacitor filter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55123226A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59154929U (en) * | 1983-04-01 | 1984-10-17 | パイオニア株式会社 | bandpass filter |
JPS60126698A (en) * | 1983-12-13 | 1985-07-06 | 株式会社河合楽器製作所 | Electronic musical instrument |
JPS62145927A (en) * | 1985-12-20 | 1987-06-30 | Hitachi Ltd | Data converter |
JPS62209913A (en) * | 1986-03-10 | 1987-09-16 | Hitachi Ltd | Switched capacitor filter |
US6509791B2 (en) | 2001-05-08 | 2003-01-21 | Fujitsu Limited | Switched capacitor filter circuit |
-
1979
- 1979-03-16 JP JP3072779A patent/JPS55123226A/en active Pending
Non-Patent Citations (1)
Title |
---|
IEEE JOURNAL OF SOLID-STATE CLRCUITS=1977 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59154929U (en) * | 1983-04-01 | 1984-10-17 | パイオニア株式会社 | bandpass filter |
JPS60126698A (en) * | 1983-12-13 | 1985-07-06 | 株式会社河合楽器製作所 | Electronic musical instrument |
JPS62145927A (en) * | 1985-12-20 | 1987-06-30 | Hitachi Ltd | Data converter |
JPS62209913A (en) * | 1986-03-10 | 1987-09-16 | Hitachi Ltd | Switched capacitor filter |
US6509791B2 (en) | 2001-05-08 | 2003-01-21 | Fujitsu Limited | Switched capacitor filter circuit |
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