GB1045375A - Improvements in or relating to frequency-modulation circuits - Google Patents
Improvements in or relating to frequency-modulation circuitsInfo
- Publication number
- GB1045375A GB1045375A GB2211565A GB2211565A GB1045375A GB 1045375 A GB1045375 A GB 1045375A GB 2211565 A GB2211565 A GB 2211565A GB 2211565 A GB2211565 A GB 2211565A GB 1045375 A GB1045375 A GB 1045375A
- Authority
- GB
- United Kingdom
- Prior art keywords
- delay
- modulator
- branches
- amplifier
- frequency modulation
- 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
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/38—Angle modulation by converting amplitude modulation to angle modulation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
Landscapes
- Amplitude Modulation (AREA)
- Amplifiers (AREA)
Abstract
1,045,375. Frequency modulation. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. May 25, 1965 [May 28, 1964], No. 22115/65. Heading H3R. A frequency modulation circuit comprises three parallel branches (a) an inverting amplifier 1 and a delay unit 4, (b) a delay unit 5 and a limiter 2, and (c) an amplitude modulator 3, the arrangement being such that the sum of the transit times in branches (a) and (b) at centre frequency is the minimum value at which the phase shift is 180 degrees and the sum of the transit times in branches (a) and (c) is the minimum value at which the phase shift is 90 degrees. It is shown that the effect of the twofeed-back paths (b) and (c) is to convert amplitude modulation supplied to modulator 3 into frequency modulation with little distortion. The delay units 4 and 5 are preferably coaxial cables, and if the path (c) includes delay or a delay unit 7, the equivalent delay should be subtracted from 4 and added to 5. The modulator 3 may be of the ring type including four semi-conductor diodes and coupled to the amplifier 1 through a transmission line transformer having bifilarly-wound air coils. The limiter 2 may comprise two diodes connected in series opposition, and the amplifier 1 may include valves (Fig. 4, not shown) or transistors (Fig. 5, not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6405948A NL6405948A (en) | 1964-05-28 | 1964-05-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1045375A true GB1045375A (en) | 1966-10-12 |
Family
ID=19790176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2211565A Expired GB1045375A (en) | 1964-05-28 | 1965-05-25 | Improvements in or relating to frequency-modulation circuits |
Country Status (8)
| Country | Link |
|---|---|
| AT (1) | AT255480B (en) |
| BE (1) | BE664565A (en) |
| CH (1) | CH430810A (en) |
| DE (1) | DE1272390B (en) |
| DK (1) | DK111573B (en) |
| GB (1) | GB1045375A (en) |
| NL (1) | NL6405948A (en) |
| SE (1) | SE332448B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2460068A1 (en) * | 1979-06-25 | 1981-01-16 | Rca Corp | VARIABLE FREQUENCY OSCILLATOR |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4028641A (en) * | 1976-05-11 | 1977-06-07 | Bell Telephone Laboratories, Incorporated | Linear phase modulator including a pair of Armstrong modulators |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL86726C (en) * | 1953-01-19 |
-
0
- BE BE664565D patent/BE664565A/xx unknown
-
1964
- 1964-05-28 NL NL6405948A patent/NL6405948A/xx unknown
-
1965
- 1965-05-25 AT AT475265A patent/AT255480B/en active
- 1965-05-25 CH CH729765A patent/CH430810A/en unknown
- 1965-05-25 GB GB2211565A patent/GB1045375A/en not_active Expired
- 1965-05-25 DE DE19651272390 patent/DE1272390B/en not_active Withdrawn
- 1965-05-25 DK DK264265A patent/DK111573B/en unknown
- 1965-05-25 SE SE691165A patent/SE332448B/xx unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2460068A1 (en) * | 1979-06-25 | 1981-01-16 | Rca Corp | VARIABLE FREQUENCY OSCILLATOR |
Also Published As
| Publication number | Publication date |
|---|---|
| NL6405948A (en) | 1965-11-29 |
| DK111573B (en) | 1968-09-16 |
| AT255480B (en) | 1967-07-10 |
| CH430810A (en) | 1967-02-28 |
| DE1272390B (en) | 1968-07-11 |
| SE332448B (en) | 1971-02-08 |
| BE664565A (en) |
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