专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

31. 发明专利

SE315952B 未知
公开(公告)号：SE315952B
公开(公告)日：1969-10-13
申请号：SE617866
申请日：1966-05-05
申请人： SIEMENS AG
发明人： MUELLER R
IPC分类号： H01L29/66 , H01L29/00 , H01L29/78 , H01L45/02 , H03F1/20 , H03F3/16 , H03F3/193 , H01L11/14
摘要： 1,141,613. Semi-conductor devices. SIEMENS A.G. 4 May, 1966 [5 May, 1965], No. 19669/66. Heading H1K. In a high frequency field effect transistor one or more control electrodes of insulated gate type are in the form of a delay line structure (e.g. interdigitated electrodes) with a delay direction parallel to the channel length. In Fig. 2, source and drain electrodes 5, 6 provide the field to cause carriers to drift in the channel underlying interdigitated insulated control electrodes 1 and 2 which are provided on both sides of the semi-conductor body 4. A high frequency signal 7; 7 1 is applied to one end of electrodes 1 and 2 and the carrier velocity and frequency are so phase related that as the carriers pass under the electrode fingers current is induced in the delay line structure to provide amplifier current at the other end 88 1 of the control electrodes. In a modification (Fig. 1, not shown) only two connections are made to the pair of interdigitated electrodes which act as a negative resistance due to the carrier-field phase relationship. Silicon may be used as the semi-conductor, the electrodes overlying an oxide layer and doping may be increased linearly along the channel to provide an effective constant channel width.

32. 发明专利

FR1540466A 未知
公开(公告)号：FR1540466A
公开(公告)日：1968-09-27
申请号：FR117874
申请日：1967-08-16
申请人： EURATOM
发明人： BECKER WINFRIED
IPC分类号： H03F1/20 , H04B1/66 , H04N7/12

33. 发明专利

NL6713051A 未知
公开(公告)号：NL6713051A
公开(公告)日：1968-03-27
申请号：NL6713051
申请日：1967-09-25
IPC分类号： H03F1/18 , H03F1/20 , H03H7/01 , H03F1/42 , H01P1/20 , H03F3/60

34. 发明专利

DE1256734B 未知
公开(公告)号：DE1256734B
公开(公告)日：1967-12-21
申请号：DET0032140
申请日：1966-09-27
申请人： TELEFUNKEN PATENT
发明人： BURKHARDTSMAIER DR-ING WOLFGAN , NIELINGER DIPL-ING HORST
IPC分类号： H03F1/20

35. 发明专利

GB963185A Improvements in or relating to distributed high-frequency amplifiers 未知
公开(公告)号：GB963185A
公开(公告)日：1964-07-08
申请号：GB1498763
申请日：1963-04-17
申请人： TELEFUNKEN PATENT
IPC分类号： H03F1/20
摘要： 963,185. Distributed amplifiers. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. April 17, 1963 [April 17, 1962], No. 14987/63. Headings H3T and H3W. In a distributed amplifier of the type in which the anodes of a number of valves I-IV, Fig. 2a, are connected to successive points in a tapered transmission line, the load impedance and gain are increased by using impedance matching transformers between sections of line. The Specification gives a mathematical explanation of the basis for design. It is shown that if Z1 is the characteristic impedance of the first section of line, connected to valve V1, Fig. 3, and m the voltage step-up ratio of the following transformer, then the second valve should, for matching purposes, work into an impedance of Z1m so that the second section of line must have a combined impedance of Z2=m /m+1 Z1. Transformers may be used between successive sections of the anode line; alternatively, the first section of line may be transformer connected to the second which is followed by a number of tapered line sections without transformer connection. When the line impedance has become sufficiently reduced, transformer connection is again used, to be followed by a further tapered line (Fig. 4, not shown) Autotransformers may be used, the leakage inductance being thrown into the impedances of the line, which is of band-pass type. In a further push-pull embodiment, the transformer is of 1: 2 ratio and comprises two equal lengths of concentric transmission line, Fig. 6, with the inners and outers cross-connected at the input end, the output being taken from the two inner conductors: the characteristic impedance of the lines may be increased by the use of helical inner conductors. The arrangement may be neutralized so as to use triode valves or transistors. The capacities shown across the two input sides of the transformer network and which terminate the preceding filter network may comprise the anode to ground capacities of a further pair of valves (Fig. 8, not shown).

36. 发明专利

DE1126947B 未知
公开(公告)号：DE1126947B
公开(公告)日：1962-04-05
申请号：DED0030679
申请日：1959-05-16
申请人： PHILIPS PATENTVERWALTUNG
发明人： SCHMIDT-BRUECKEN DIPL-ING HEIN
IPC分类号： H03F1/20

37. 发明专利

DE1122590B 未知
公开(公告)号：DE1122590B
公开(公告)日：1962-01-25
申请号：DEM0042076
申请日：1959-07-08
申请人： MARCONI WIRELESS TELEGRAPH CO
发明人： SOSIN BOLESLAW MARIAN
IPC分类号： H03F1/20
摘要： 846,633. Valve amplifying circuits. MARCONI'S WIRELESS TELEGRAPH CO. Ltd. May 12, 1959 [July 23, 1958], No. 23688/58. Class 40(6). In a distributed amplifier comprising a grid line L1 and anode line, the portion L2 of the anode line remote from the output end 2 is of uniform impedance whereas the portion L3-6 adjacent the output end is tapered. The anode line may comprise different parts of a single winding the pitch of which is varied in discrete steps over the tapered portion of the line. Two such amplifiers may be used in push-pull (Fig. 2 not shown) the input and output being by means of centre-tapped transformers. The amplifier may employ pairs of triodes in cascode connection instead of screen-grid valves.

38. 发明专利

GB840423A Improvements relating to electron discharge valves 未知
公开(公告)号：GB840423A
公开(公告)日：1960-07-06
申请号：GB2638155
申请日：1955-09-15
申请人： EMI LTD
发明人： PERCIVAL WILLIAM SPENCER
IPC分类号： H01J21/02 , H03F1/20
摘要： 840,423. Electric discharge tubes. ELECTRIC & MUSICAL INDUSTRIES Ltd. Sept. 7, 1956 [Sept. 15, 1955], No. 26381/55. Class 39(1). In an electron discharge valve having at least three electrodes two of which are inductive and form respectively with the third electrode an input and an output transmission line, the inductive electrodes are wound to cause the flux leakage between one inductive electrode and different parts of the other inductive electrode to be mutually cancelling so as to reduce the magnetic coupling which would otherwise exist therebetween. As shown, the inductive electrodes comprise respectively a control electrode 2, Fig. 2, and an anode 5, the third electrode being the cathode 1, the control electrode 2, Fig. 1, comprising a coil wound round the flat cathode and the anode comprising two coils 5 wound in the same sense and disposed on opposite sides of the control electrode. A screen grid 3 and suppressor grid 4 are also provided. The input and output lines are terminated by resistors 14 and 12, 13 respectively to minimise reflection. The anode may comprise two coils wound in opposite senses but coaxially disposed, one coil being larger than the other in order to reduce the coupling. Specification 464,977 is referred to.

39. 发明专利

DE1059979B 未知
公开(公告)号：DE1059979B
公开(公告)日：1959-06-25
申请号：DET0014830
申请日：1958-03-04
申请人： TELEFUNKEN GMBH
发明人： FISCHER DIPL-ING KARL
IPC分类号： H03F1/16 , H03F1/20

40. 发明专利

GB794988A Improvements in or relating to circuit arrangements for improving signal to noise or interference ratio 未知
公开(公告)号：GB794988A
公开(公告)日：1958-05-14
申请号：GB230355
申请日：1955-01-26
申请人： MARCONI WIRELESS TELEGRAPH CO
发明人： KEALL OSWOLD EDWARD , MILLER WILLIAM FRANCIS
IPC分类号： G01S7/292 , G01S7/35 , H03F1/20
摘要： 794,988. Pulse radar. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Jan. 9, 1956 [Jan. 26, 1955], No. 2303/55. Class 40 (7). The signal/noise ratio of a pulse radar receiver is improved by introducing time delays into the I.F. amplifier and combining undelayed signals with successively delayed signals. In one embodiment, undelayed signals from valve 3 are added to signals from valves 4, 5 6 which have been successively delayed by delay lines 71, 81, 91. Each time delay is made equal to a whole number divided by the centre frequency of the LF. amplifier and is not less than the reciprocal of twice the bandwidth (measured between points 3 dB. down). The signal to noise improvement is then equal to the square root of the number of delays. In a modification Fig. 2 (not shown), a distributed delay line is used instead of lumped components, and in another modification, Fig. 3 (not shown), the delay line is split into sections by buffer amplifier valves. The gain of each amplifier may be varied. Reference has been directed by the Comptroller to Specification 773,356.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式