GB1170028A - F.M. Discriminator - Google Patents
F.M. DiscriminatorInfo
- Publication number
- GB1170028A GB1170028A GB4105768A GB4105768A GB1170028A GB 1170028 A GB1170028 A GB 1170028A GB 4105768 A GB4105768 A GB 4105768A GB 4105768 A GB4105768 A GB 4105768A GB 1170028 A GB1170028 A GB 1170028A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- capacitor
- resistor
- emitter
- taken
- 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
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
- H03D3/06—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators
- H03D3/14—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of semiconductor devices having more than two electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stereo-Broadcasting Methods (AREA)
- Amplifiers (AREA)
Abstract
1,170,028. Frequency discriminators. PYE Ltd. 28 Aug., 1968, No. 41057/68. Heading H3A. A frequency discriminator comprises a transistor with signals whose relative phase is frequency dependent applied to two electrodes, demodulated signal being taken from a third electrode. Limiter T 1 feeds one input into the emitter of transistor T 2 via D.C. blocking capacitor C 1 and resistor R 1 and another into the base via capacitor C 3 and a shunt tuned circuit comprising capacitor C 2 , inductor L 2 and damping resistor R 3 . The collector of transistor T 2 is biased from terminal 3 via resistor R 4 , output being taken across capacitor C 4 which provides smoothing and D.C.-emphasis. The relative signal applied to the emitter of transistor T 2 may be adjusted by returning capacitor C 1 to a variable tapping point on resistor R 1 . Transistor T 2 may be of the fieldeffect type: alternatively, a double-gate field effect transistor may be used, the two R.F. inputs being applied to the respective gates.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4105768A GB1170028A (en) | 1968-08-28 | 1968-08-28 | F.M. Discriminator |
| NL6912966A NL6912966A (en) | 1968-08-28 | 1969-08-25 | |
| DE19691943522 DE1943522A1 (en) | 1968-08-28 | 1969-08-27 | FM discriminator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4105768A GB1170028A (en) | 1968-08-28 | 1968-08-28 | F.M. Discriminator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1170028A true GB1170028A (en) | 1969-11-12 |
Family
ID=10417917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4105768A Expired GB1170028A (en) | 1968-08-28 | 1968-08-28 | F.M. Discriminator |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1943522A1 (en) |
| GB (1) | GB1170028A (en) |
| NL (1) | NL6912966A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0124316A1 (en) * | 1983-04-22 | 1984-11-07 | Sinclair Research Limited | Frequency discriminators |
-
1968
- 1968-08-28 GB GB4105768A patent/GB1170028A/en not_active Expired
-
1969
- 1969-08-25 NL NL6912966A patent/NL6912966A/xx unknown
- 1969-08-27 DE DE19691943522 patent/DE1943522A1/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0124316A1 (en) * | 1983-04-22 | 1984-11-07 | Sinclair Research Limited | Frequency discriminators |
Also Published As
| Publication number | Publication date |
|---|---|
| NL6912966A (en) | 1970-03-03 |
| DE1943522A1 (en) | 1970-08-27 |
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