GB1464738A - Electronically tuned amplifier stage - Google Patents
Electronically tuned amplifier stageInfo
- Publication number
- GB1464738A GB1464738A GB4125274A GB4125274A GB1464738A GB 1464738 A GB1464738 A GB 1464738A GB 4125274 A GB4125274 A GB 4125274A GB 4125274 A GB4125274 A GB 4125274A GB 1464738 A GB1464738 A GB 1464738A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacities
- diode
- tuning
- variable capacity
- amplifier stage
- 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
- 238000004804 winding Methods 0.000 abstract 3
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/191—Tuned amplifiers
-
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/72—Indexing scheme relating to amplifiers the amplifier stage being a common gate configuration MOSFET
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
1464738 Electronically tuned amplifiers SCHRADER ELECTRONICA NV 23 Sept 1974 [21 Sept 1973] 41252/74 Headings H3Q and H3T In an amplifier stage a tuned circuit 6, has a primary winding 5 connected to a variable capacity tuning diode 8 to which a tuning voltage 13 supplied and a secondary winding 20 connected in series with the capacitance 22 between the base and emitter of an earthed base transistor 21 and the junction of the emitter and the secondary winding 20 is connected through a capacitance 60 to a second variable capacity diode 61 to which the tuning voltage 13 is supplied such that the capacities of the two diode 8 and 61 vary simultaneously in the same sense. As shown in Fig. 1 a first transistor stage 21 is in cascade with a second transistor stage 40 and can be used for amplifying T.V. signals from an aerial. Variation of the capacities at the emitters of the transistors 21 and 40 by variable capacity diodes 61 and 64 in the same sense as the changes in capacities of the tuning diodes 8, 35 and 46 provides a more uniform gain as a function of the signal frequency (curve B, Fig. 2, not shown), and also improves the gain for lower signal frequencies which results in an improved signal to noise ratio.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7313091A NL161935C (en) | 1973-09-21 | 1973-09-21 | ELECTRICALLY TUNABLE AMPLIFIER CHAIN. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1464738A true GB1464738A (en) | 1977-02-16 |
Family
ID=19819661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4125274A Expired GB1464738A (en) | 1973-09-21 | 1974-09-23 | Electronically tuned amplifier stage |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE820138A (en) |
| DE (1) | DE2443533C3 (en) |
| FR (1) | FR2245127B3 (en) |
| GB (1) | GB1464738A (en) |
| NL (1) | NL161935C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3205875C2 (en) * | 1982-02-18 | 1984-03-08 | Siemens AG, 1000 Berlin und 8000 München | Adjustable equalizer circuit |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1254198B (en) * | 1964-07-08 | 1967-11-16 | Telefunken Patent | Oscillator, the frequency of which can be tuned with the aid of a capacitance variation diode |
| DE1246037B (en) * | 1965-10-21 | 1967-08-03 | Telefunken Patent | Transistor amplifier with collector resonance circuit and with regulation of the degree of amplification by a direct voltage |
| DE1287655B (en) * | 1967-10-24 | 1969-01-23 | ||
| NL153037B (en) * | 1968-03-04 | 1977-04-15 | Philips Nv | OSCILLATOR SWITCH FOR ULTRA HIGH FREQUENCY ELECTRICAL VIBRATIONS. |
| DE1766734B1 (en) * | 1968-07-11 | 1971-03-11 | Philips Pat | Oscillator circuit for the UHF range with one transistor |
| DE1791070B2 (en) * | 1968-09-06 | 1976-11-25 | Philips Patentverwaltung Gmbh, 2000 Hamburg | INPUT SWITCH FOR CAR RADIO RECEIVER |
-
1973
- 1973-09-21 NL NL7313091A patent/NL161935C/en not_active IP Right Cessation
-
1974
- 1974-09-11 DE DE19742443533 patent/DE2443533C3/en not_active Expired
- 1974-09-20 BE BE148720A patent/BE820138A/en unknown
- 1974-09-20 FR FR7431888A patent/FR2245127B3/fr not_active Expired
- 1974-09-23 GB GB4125274A patent/GB1464738A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2245127B3 (en) | 1977-07-01 |
| DE2443533C3 (en) | 1982-02-25 |
| FR2245127A1 (en) | 1975-04-18 |
| BE820138A (en) | 1975-01-16 |
| DE2443533B2 (en) | 1976-05-13 |
| NL161935C (en) | 1980-03-17 |
| NL161935B (en) | 1979-10-15 |
| NL7313091A (en) | 1975-03-25 |
| DE2443533A1 (en) | 1975-04-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |