JPS57129014A - Code switching low-pass filter - Google Patents
Code switching low-pass filterInfo
- Publication number
- JPS57129014A JPS57129014A JP1409981A JP1409981A JPS57129014A JP S57129014 A JPS57129014 A JP S57129014A JP 1409981 A JP1409981 A JP 1409981A JP 1409981 A JP1409981 A JP 1409981A JP S57129014 A JPS57129014 A JP S57129014A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- capacitor
- input terminal
- amplifier
- pass filter
- 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
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/04—Frequency selective two-port networks
- H03H11/12—Frequency selective two-port networks using amplifiers with feedback
- H03H11/126—Frequency selective two-port networks using amplifiers with feedback using a single operational amplifier
- H03H11/1278—Modifications to reduce detrimental influences of amplifier imperfections, e.g. limited gain-bandwith product, limited input impedance
Landscapes
- Networks Using Active Elements (AREA)
Abstract
PURPOSE:To simplify the constitution and to reduce generation of a drift and a noise, by decreasing the number of operational amplifiers to one. CONSTITUTION:An input signal is supplied to both a negative input terminal and a positive input terminal of an operational amplifier 24 through the first resistor 22 and the second resistor 23. The positive input terminal of this amplifier 24 is grounded through a parallel circuit of a junction FET 25 constituting the first switch, and a capacitor 26. Also, a parallel circuit consisting of a junction FET 27 constituting the second switch, a capacitor 28 and the third resistor 29 is connected between the output terminal and the negative input terminal of the amplifier 24. Also, resistance values of the resistor 22 and 29 are made equal. Furthermore, the product of a resistance value of the resistor 23 and a capacity value of the capacitor 26 is made equal to the product of a resistance value of the resistor 29 and a capacity value of the capacitor 28. In this way, in accordance with a code control input, said first and second switches are turned on alternately.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1409981A JPS57129014A (en) | 1981-02-02 | 1981-02-02 | Code switching low-pass filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1409981A JPS57129014A (en) | 1981-02-02 | 1981-02-02 | Code switching low-pass filter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57129014A true JPS57129014A (en) | 1982-08-10 |
Family
ID=11851662
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1409981A Pending JPS57129014A (en) | 1981-02-02 | 1981-02-02 | Code switching low-pass filter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57129014A (en) |
-
1981
- 1981-02-02 JP JP1409981A patent/JPS57129014A/en active Pending
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