GB1225423A - - Google Patents
Info
- Publication number
- GB1225423A GB1225423A GB1225423DA GB1225423A GB 1225423 A GB1225423 A GB 1225423A GB 1225423D A GB1225423D A GB 1225423DA GB 1225423 A GB1225423 A GB 1225423A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diode
- conducting
- varicap diode
- varicap
- variation
- 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
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
- H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
- H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
- H03J5/244—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Filters And Equalizers (AREA)
Abstract
1,225,423. Tuning arrangements. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. 27 March, 1968 [30 March, 1967], No. 14635/68. Heading H3Q. A tuning arrangement using a varicap diode which can be made conducting or non-conducting for band-switching is temperature compensated by a second varicap diode conducting when the first is non-conducting and vice versa, so that the capacitance variation of each varicap diode with temperature is compensated by that of the other conducting diode. Fig. 3 shows a transistor oscillator for a television receiver operating in Bands I and III. For Band III the switches S 1 -S 4 are as shown by the solid lines, tuning being effected by a potentiometer 4, 5, 6 across a regulated source 3 and an unregulated source 7. The resonant collector circuit consists of inductors 20, 21 connected in parallel by a conductive varicap diode 2, tuned by capacitor 22 and reverse-biased varicap diode 1. Feedback to the emitter occurs by capacitor 11 which forms a voltage divider with capacitor 13 and reversebiased varicap diode 12. For Band I the switches S 1 -S 4 are put in the dotted position where varicap diode 1 becomes conducting and short-circuits the inductor 21 and capacitor 22, leaving inductor 20 and reverse-biased varicap diode 2 to form the collector resonant circuit. At the same time varicap diode 12 becomes conducting so that the feedback potential divider comprises capacitors 11 and 13 only. Temperature variation of diode 1 (when reverse biased) is only serious at low voltages, i.e. when the slider of potentiometer 4 is at or near its lowest point. Since resistor 5 is of low value, variation of capacitance with temperature is compensated by a variation of its bias voltage due to variation of the voltage drop across the conductive diode 2. Resistors 14-19 are connected to other varicap diodes in the signal-frequency circuits of the receiver and these will be temperature compensated in a similar manner.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DET0033541 | 1967-03-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1225423A true GB1225423A (en) | 1971-03-17 |
Family
ID=7557847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1225423D Expired GB1225423A (en) | 1967-03-30 | 1968-03-27 |
Country Status (5)
| Country | Link |
|---|---|
| AT (1) | AT276492B (en) |
| BE (1) | BE712982A (en) |
| ES (1) | ES352109A1 (en) |
| FR (1) | FR1557474A (en) |
| GB (1) | GB1225423A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2129890A1 (en) * | 1971-06-16 | 1972-12-21 | Standard Elek K Lorenz Ag | Circuit for correcting the temperature response of tuning arrangements |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2028400B2 (en) * | 1970-06-09 | 1978-04-27 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Push-button circuit for programmed frequency selection in radio and television sets |
| DE2945546C2 (en) * | 1979-11-10 | 1983-09-29 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Circuit arrangement for tunable HF circuits |
-
1968
- 1968-03-26 FR FR1557474D patent/FR1557474A/fr not_active Expired
- 1968-03-27 GB GB1225423D patent/GB1225423A/en not_active Expired
- 1968-03-28 ES ES352109A patent/ES352109A1/en not_active Expired
- 1968-03-29 BE BE712982D patent/BE712982A/xx unknown
- 1968-03-29 AT AT310868A patent/AT276492B/en active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2129890A1 (en) * | 1971-06-16 | 1972-12-21 | Standard Elek K Lorenz Ag | Circuit for correcting the temperature response of tuning arrangements |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1614794A1 (en) | 1970-12-23 |
| AT276492B (en) | 1969-11-25 |
| DE1614794B2 (en) | 1975-08-14 |
| ES352109A1 (en) | 1969-06-16 |
| BE712982A (en) | 1968-07-31 |
| FR1557474A (en) | 1969-02-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |