GB1293907A - Self-tuning circuits - Google Patents
Self-tuning circuitsInfo
- Publication number
- GB1293907A GB1293907A GB5855368A GB5855368A GB1293907A GB 1293907 A GB1293907 A GB 1293907A GB 5855368 A GB5855368 A GB 5855368A GB 5855368 A GB5855368 A GB 5855368A GB 1293907 A GB1293907 A GB 1293907A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tuned circuit
- input
- dec
- amplifier
- capacitor
- 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
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
- H03J3/18—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance
- H03J3/185—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance with varactors, i.e. voltage variable reactive diodes
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
1293907 Automatic tuning circuits ENGLISH ELECTRIC CO Ltd 10 Dec 1969 [10 Dec 1968] 58553/68 Heading H3A [Also in Division H2] In an automatic tuning circuit, a tuned circuit includes a capacitor c and an amplifier 12-14 and the input signals developed across the tuned circuit and a resistance R D are applied to a phase comparator 6-11 whose output controls the gain of the amplifier so as to vary the effective impedance of the capacitor in a sense tending to maintain the tuned circuit in resonance with the input signal frequency. In operation, the phase comparator phase-shifts the input a by 90 degrees at 6, squares the inputs a, b at 7, 9 using one of the squared signals as a clamp for the other and applies the clamped signal to an integrator 11. The integrator output is applied to a potential divider 12, 13 having a voltage variable element, e.g. FET 12. The instantaneous output at the junction of resistors R 1 , R 2 is thus designed to be indicative of amplitude and vector changes only of the input signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5855368A GB1293907A (en) | 1968-12-10 | 1968-12-10 | Self-tuning circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5855368A GB1293907A (en) | 1968-12-10 | 1968-12-10 | Self-tuning circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1293907A true GB1293907A (en) | 1972-10-25 |
Family
ID=10481890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5855368A Expired GB1293907A (en) | 1968-12-10 | 1968-12-10 | Self-tuning circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1293907A (en) |
-
1968
- 1968-12-10 GB GB5855368A patent/GB1293907A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |