JPS6429111A - Active filter - Google Patents
Active filterInfo
- Publication number
- JPS6429111A JPS6429111A JP18620287A JP18620287A JPS6429111A JP S6429111 A JPS6429111 A JP S6429111A JP 18620287 A JP18620287 A JP 18620287A JP 18620287 A JP18620287 A JP 18620287A JP S6429111 A JPS6429111 A JP S6429111A
- Authority
- JP
- Japan
- Prior art keywords
- omega0
- operational amplifiers
- active filter
- filter
- individually
- 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
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- Networks Using Active Elements (AREA)
Abstract
PURPOSE:To control optionally a omega0 and a Q of an active filter by giving an individual control current to a voltage gain control current input terminal of two operational amplifiers respectively. CONSTITUTION:Current source circuits 13, 14 each comprising a current mirror circuit are provided respectively to operational amplifiers 21, 22 so as to decide individually the mutual conductance gm of the two operational amplifiers constituting a basic active filter, resulting that the Q and omega0 are expressed as a function of gm. The omega0 expresses the cut-off frequency for LPF, HPF and the center frequency for BPF and the Q represents the quality of the filter. The gm is decided individually by the operational amplifiers 21, 22, then the Q and omega0 are controlled.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18620287A JPS6429111A (en) | 1987-07-24 | 1987-07-24 | Active filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18620287A JPS6429111A (en) | 1987-07-24 | 1987-07-24 | Active filter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6429111A true JPS6429111A (en) | 1989-01-31 |
Family
ID=16184162
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18620287A Pending JPS6429111A (en) | 1987-07-24 | 1987-07-24 | Active filter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6429111A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0345007A (en) * | 1989-07-13 | 1991-02-26 | Toko Inc | Leapfrog filter |
JPH0490210A (en) * | 1990-08-02 | 1992-03-24 | Sharp Corp | Active filter circuit |
JPH04278708A (en) * | 1991-03-06 | 1992-10-05 | Rohm Co Ltd | Gyrator |
US5594542A (en) * | 1994-09-13 | 1997-01-14 | Sharp Kabushiki Kaisha | Image forming apparatus having double-sided image forming and post processing capability |
US5663676A (en) * | 1995-02-21 | 1997-09-02 | Nec Corporation | Active filter independently controlling cut-off frequency and quality factor |
US6148164A (en) * | 1998-10-14 | 2000-11-14 | Seiko Epson Corporation | Printer having a double-sided print function and double-sided print controller |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58161413A (en) * | 1982-03-18 | 1983-09-26 | Sony Corp | Multi-purpose filter |
JPS61120513A (en) * | 1984-11-16 | 1986-06-07 | Sony Corp | Biquad type constant current active filter |
-
1987
- 1987-07-24 JP JP18620287A patent/JPS6429111A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58161413A (en) * | 1982-03-18 | 1983-09-26 | Sony Corp | Multi-purpose filter |
JPS61120513A (en) * | 1984-11-16 | 1986-06-07 | Sony Corp | Biquad type constant current active filter |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0345007A (en) * | 1989-07-13 | 1991-02-26 | Toko Inc | Leapfrog filter |
JPH0490210A (en) * | 1990-08-02 | 1992-03-24 | Sharp Corp | Active filter circuit |
JPH04278708A (en) * | 1991-03-06 | 1992-10-05 | Rohm Co Ltd | Gyrator |
US5594542A (en) * | 1994-09-13 | 1997-01-14 | Sharp Kabushiki Kaisha | Image forming apparatus having double-sided image forming and post processing capability |
US5663676A (en) * | 1995-02-21 | 1997-09-02 | Nec Corporation | Active filter independently controlling cut-off frequency and quality factor |
US6148164A (en) * | 1998-10-14 | 2000-11-14 | Seiko Epson Corporation | Printer having a double-sided print function and double-sided print controller |
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