GB1238059A - - Google Patents
Info
- Publication number
- GB1238059A GB1238059A GB6020368A GB1238059DA GB1238059A GB 1238059 A GB1238059 A GB 1238059A GB 6020368 A GB6020368 A GB 6020368A GB 1238059D A GB1238059D A GB 1238059DA GB 1238059 A GB1238059 A GB 1238059A
- Authority
- GB
- United Kingdom
- Prior art keywords
- impedance
- amplifier
- resistor
- converters
- dec
- 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.)
- Expired
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
- H03H11/08—Frequency selective two-port networks using gyrators
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/46—One-port networks
- H03H11/48—One-port networks simulating reactances
- H03H11/485—Simulating inductances using operational amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/46—One-port networks
- H03H11/48—One-port networks simulating reactances
- H03H11/50—One-port networks simulating reactances using gyrators
Landscapes
- Control Of Voltage And Current In General (AREA)
- Networks Using Active Elements (AREA)
Abstract
1,238,059. Active filters. POST OFFICE. 15 Dec., 1969 [18 Dec., 1968], No. 60203/68. Heading H3U. An impedance converter comprises an amplifier 21 with resistive feedback paths 23, 24 to inverting and non-inverting inputs, and an output resistor 25, whereby the impedance at the input 20 has a resistive component together with an impedance inversely proportional to that of a load impedance 26 connected across the output resistor 25. The resistors are chosen such that R 22 = R 25 , R 23 = R 24 . In order to simulate a "floating" impedance, the resistor 25 may be replaced by a second similarly connected converter, Figs. 8, 9 (not shown). With this cascade arrangement, the feedback to the inputs of the first amplifier may be derived from the output of the second amplifier, Fig. 25 (not shown). Filter circuits using such converters to simulate series and shunt inductors are described. In order to obtain a gyrator, i.e. no resistive component to the simulated impedance, three converters may be connected incascade, Figs. 18, 19 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB6020368 | 1968-12-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1238059A true GB1238059A (en) | 1971-07-07 |
Family
ID=10485201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6020368A Expired GB1238059A (en) | 1968-12-18 | 1968-12-18 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1238059A (en) |
-
1968
- 1968-12-18 GB GB6020368A patent/GB1238059A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
| PCNP | Patent ceased through non-payment of renewal fee |