GB1088719A - Improvements in or relating to modulating circuit arrangements - Google Patents
Improvements in or relating to modulating circuit arrangementsInfo
- Publication number
- GB1088719A GB1088719A GB4278765A GB4278765A GB1088719A GB 1088719 A GB1088719 A GB 1088719A GB 4278765 A GB4278765 A GB 4278765A GB 4278765 A GB4278765 A GB 4278765A GB 1088719 A GB1088719 A GB 1088719A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diodes
- switches
- protect
- transistors
- auxiliary
- 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
- 230000004048 modification Effects 0.000 abstract 3
- 238000012986 modification Methods 0.000 abstract 3
- 238000004804 winding Methods 0.000 abstract 2
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 239000004065 semiconductor Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
- H03C1/54—Balanced modulators, e.g. bridge type, ring type or double balanced type
- H03C1/542—Balanced modulators, e.g. bridge type, ring type or double balanced type comprising semiconductor devices with at least three electrodes
- H03C1/545—Balanced modulators, e.g. bridge type, ring type or double balanced type comprising semiconductor devices with at least three electrodes using bipolar transistors
Landscapes
- Amplifiers (AREA)
Abstract
1,088,719. Inverting. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. Oct. 8, 1965 [Oct. 22, 1964], No. 42787/65. Heading H2F. [Also in Division H3] A power amplifier for use in the modulating system described in Specification 1,082,325 comprising a pair of electronic switches 531 and 532 connected in feed paths from potential sources U31 and U32 to a resonant load LCR, the switches being controlled by width-modulated pulses to give an amplitude modulated sine wave output, is characterized by the provision of auxiliary electronic switches H31 and H32 which protect S31 and S32 from surge voltages produced by the inductance L. It is arranged that H31 is conductive except when S31 conducts and H32 is conductive except when S32 conducts. Diodes D31, D32 in series with H31 and H32 have the same pass directions as their associated transistors which they protect from reverse voltage, and diodes D33, D34 ensure that reverse voltages are applied across the diodes D31 and D32 instead of across the transistors. Diodes D33 and D34 may be replaced by resistances, and all the diodes D31-D34 may be omitted if thermionic valves or four-layer semi-conductor diodes replace the transistors H31 and H32. The diodes G31 and G32 protect S31 and S32 under abnormal conditions. In a modification, Fig. 5 (not shown), a single potential source U5 is connected alternately by S51 and S52 to two halves of an input winding of a transformer T5 feeding the load; the auxiliary switches H51 and H52 and their associated diodes are connected across the two halves of the input winding. In another modification, Fig. 6 (not shown), a potential source U6 feeds a bridge circuit including four switching devices S61-S64, and the auxiliary switches H62 and H63 are connected across the output diagonal of the bridge. In further modifications, Fig. 7 and 8 (not shown), the auxiliary switches are connected in series with their respective main switches, diodes being used to connect the junctions to one end of the load or output circuit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1964T0027256 DE1282742B (en) | 1964-10-22 | 1964-10-22 | Method for generating an amplitude-modulated high-frequency oscillation of high power with high efficiency and circuit for its implementation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1088719A true GB1088719A (en) | 1967-10-25 |
Family
ID=7553358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4278765A Expired GB1088719A (en) | 1964-10-22 | 1965-10-08 | Improvements in or relating to modulating circuit arrangements |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1282742B (en) |
| GB (1) | GB1088719A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19839802A1 (en) * | 1998-09-01 | 1999-12-09 | Siemens Ag | Amplitude modulated carrier signal generation method for contactless data transmission signals |
-
1964
- 1964-10-22 DE DE1964T0027256 patent/DE1282742B/en active Pending
-
1965
- 1965-10-08 GB GB4278765A patent/GB1088719A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1282742B (en) | 1968-11-14 |
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