GB644204A - Improvements in or relating to frequency selective amplifier circuits - Google Patents
Improvements in or relating to frequency selective amplifier circuitsInfo
- Publication number
- GB644204A GB644204A GB26210/46A GB2621046A GB644204A GB 644204 A GB644204 A GB 644204A GB 26210/46 A GB26210/46 A GB 26210/46A GB 2621046 A GB2621046 A GB 2621046A GB 644204 A GB644204 A GB 644204A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- frequency selective
- oscillator
- selective amplifier
- amplifier
- 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
- 238000005259 measurement Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Amplifiers (AREA)
Abstract
644,204. Frequency measurements. STANDARD TELEPHONES & CABLES, Ltd. Aug. 30, 1946, No. 26210. Convention date, June 8, 1943. [Class 37] [Also in Group XL (c)] A frequency selective amplifier has a feedback network comprising a bridge circuit which produces positive feedback between the output and input of the amplifier at the frequency to be amplified and negative feedback at all other frequencies. Fig. 13 shows the use of such a frequency selective amplifier in a harmonic analyser. The signal to be analysed is mixed with oscillator O1 in a mixer stage M1, filtered in a resonant filter MF1 of conventional type, Fig. 14 (not shown), mixed with oscillator 02 in a second mixer M2 and the resultant applied to a frequency selective amplifier MF2. Fig. 15 shows a modification in which two crystalcontrolled oscillators Q, Q<SP>1</SP> of fixed frequency difference feed separate mixer stages M, M' to both of which a variable frequency oscillator O is applied. The outputs of the two mixers are connected to two further mixers M1, M2, to each of which the wave to be analysed is applied and the resulting signals fed to frequency selective amplifiers MF1, MF2. The indicator may respond only when the two output frequencies are present simultaneously, Figs. 16, 17 (not shown). Specification 529,595, [Group XL], is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR256365X | 1943-06-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB644204A true GB644204A (en) | 1950-10-04 |
Family
ID=8884604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB26210/46A Expired GB644204A (en) | 1943-06-08 | 1946-08-30 | Improvements in or relating to frequency selective amplifier circuits |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE456176A (en) |
| CH (1) | CH256365A (en) |
| FR (1) | FR960736A (en) |
| GB (1) | GB644204A (en) |
| NL (2) | NL68589C (en) |
-
0
- NL NL118708D patent/NL118708B/xx unknown
- NL NL68589D patent/NL68589C/xx active
- BE BE456176D patent/BE456176A/xx unknown
- FR FR960736D patent/FR960736A/fr not_active Expired
-
1944
- 1944-06-08 CH CH256365D patent/CH256365A/en unknown
-
1946
- 1946-08-30 GB GB26210/46A patent/GB644204A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE456176A (en) | |
| FR960736A (en) | 1950-04-22 |
| NL118708B (en) | |
| NL68589C (en) | |
| CH256365A (en) | 1948-08-15 |
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