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公开(公告)号：EP0040453A3
公开(公告)日：1982-02-17
申请号：EP81200518
申请日：1981-05-14
IPC分类号： G01R27/16
CPC分类号： G01R27/28
摘要： To derive information about the R.F. impedance (Zt) presented at a port (P) of an electrical network including a source of R.F. signals (for example, an antenna and an antenna tuning unit) without requiring an additional source of R.F. signals, a circuit is coupled to the port (P) successively in two different states. This circuit comprises auxiliary network means (N 1 , N 2 ) and radio indicating means such as a radio receiver (Rx); in the two states, it presents at the port (P) different respective impedances (Z 1 , Z 2 ) and has between the port (P) and the receiver (Rx) different gains (A 1 , A 2 ), the values being selected so that there is no difference between the amplitudes and/or phases of the signals reaching the receiver (Rx) when said R.F. impedance (Zr) lies on a respective locus in the complex impedance plane. The loci may for example be defined so as to intersect at a point representing an impedance with which it is desired to equate said R.F. impedance (Zt). By switching the circuit alternately to one state and the other, amplitude demodulation in the receiver (Rx) can be used to indicate any differences in amplitude and phase. The auxiliary network means may be a hybrid transformer (HT), one port (4) ofwhich is switched between an open-circuit and a short-circuit termination.
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公开(公告)号：EP0021462A3
公开(公告)日：1981-04-15
申请号：EP80200369
申请日：1980-04-23
IPC分类号： H03H11/08
CPC分类号： H03H11/08
摘要： In order to facilitate its construction as in integrated circuit the inductive elements of the two resonant circuits in a band-pass filter are each constituted by a first port of a respective gyrator circuit (22, 23 and 24, 25 respectively) the second port of which is loaded by a capacitor (3 and 6 respectively). The first ports, across which are connected capacitors (1 and 3 respectively), are coupled one to the other, as are the second ports, in such manner that a loop is formed comprising the two gyrator circuits and the two couplings, enabling the couplings to be obtained by coupling otherwise unused outputs (24 + and 22+) to otherwise unused inputs (22- and 24- respectively) of two-input two-output voltage-controlled current sources (22,24) which form part of each gyrator circuit.
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公开(公告)号：EP0162502A3
公开(公告)日：1988-09-28
申请号：EP85200602
申请日：1985-04-18
发明人： Cosh, Ian Sinclair
IPC分类号： H04N09/75
CPC分类号： H04N9/75
摘要： A chroma keying signal generator has an input (1) to which digitally encoded colour difference signals (R-Y and BY) are applied and output (27) at which a keying signal is produced. The arrangement calculates a value tan -1 R-Y B-Y which represents the hue and a value (R-Y) 2 + (B-Y) 2 which represents the (saturation) 2. Preselected values of hue and (saturation) 2 are stored in latches (20,22) and compared with the calculated values derived from the incoming colour difference signals in comparators (24,25). When the calculated hue is substantially equal to the value stored in latch (20) and the calculated (saturation) 2 is greater than the value stored in latch (21) both comparators (24,25) produce an output which causes the AND gate (26) to produce a keying signal which is applied to output 27.
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公开(公告)号：EP0216432A3
公开(公告)日：1988-07-13
申请号：EP86201630
申请日：1986-09-23
发明人： Bates, Robert Neil
摘要： An input signal for a travelling wave or distributed amplifier having input and output transmission lines is supplied to one end (1) of the input line and an output signal is derived from one end (4) of the output line. Conventionally, the other end (2, 3) of each line is terminated in a respective matched load, but three ports of the amplifier may be employed, signal-utilising means (MXR, Figure 3; MXR, Figure 4; D, Figure 5) coupled to one end (3;2;4 respectively) of either line utilising an attenuated signal derived from signal-supply means (ANT; VCO; LOSC respectively) coupled to the other end (4;1;3 respectively) of the same line. The specification describes the use of a travelling wave amplifier to replace a circulator (CIRC, Figure 2) in an FMCW radar having a single transmitting/receiving antenna (ANT) (TWAMP1, Figure 3), to replace a directional coupler (DC) for supplying a local oscillator signal to a mixer (MXR) (TWAMP2, Figure 4), and in combination with a mixer diode (D) to form a mixer amplifier (TWAMP3, Figure 3), giving the possibility of the larger-scale integration of RF circuits.
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公开(公告)号：EP0185416A3
公开(公告)日：1988-02-10
申请号：EP85201956
申请日：1985-11-26
CPC分类号： H03H19/002 , H03C1/60 , H03D1/24 , H03H11/04
摘要： A radio receiver or transmitter including a tunable filter constituted by an N-path filter (14) having a local oscillator (52). the centre frequency of which filter is displaced from the oscillator (52) frequency through the use of feedback (26). In the case of a radio receiver the feedback provides image rejection. Preferably an i.f. signal is taken from the low frequency section of the N-path filter. In the case of a radio transmitter, an i.f. signal is applied to a low frequency path within the N-path filter. The use of feedback avoids the generation of an image frequency transmission.
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公开(公告)号：EP0182422A3
公开(公告)日：1988-01-07
申请号：EP85201810
申请日：1985-11-08
IPC分类号： H01L29/06
CPC分类号： H01L29/405 , H01L29/0619 , H01L29/0638 , H01L29/7322 , H01L29/7393 , H01L29/74 , H01L29/8611 , H01L29/872
摘要： The breakdown voltage of a p-n junction (20) operated under reverse bias in at least one mode of operation of a semiconductor device is increased by providing at least one annular region (1 to 6) forming an auxiliary p-n junction (21 to 26) within the spread of a depletion layer (30) from the reverse-biased junction (20). A passivating dielectric layer (18) with an overlying electrically resistive layer (28) extends over the semiconductor body surface between the active device region (11) forming the p-n junction (20) and a surrounding region (14) of the body portion located beyond the (outer) annular region (6). The resistive layer (28) is connected to these regions (11 and 14) but is insulated from the annular regions (1 to 6) by the dielectric layer (18). A stable high breakdown voltage can be obtained by providing the resistive layer (18) with conductive connection means (51 to 56) at the or each annular area which overlies the annular region(s) (1 to 6). The conductive connection means (51 to 56) which may be for example annular metal areas or annular highly-doped parts of the resistive layer (28) is more highly conductive than the resistance of adjacent parts (28') of the resistive layer (28) and provides an electrical connection between these adjacent parts so that a potential variation which corresponds approximately with that along the underlying semiconductor body surface (including the annular regions) can be obtained along the resistive layer (28).
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公开(公告)号：EP0214699A3
公开(公告)日：1987-12-23
申请号：EP86201540
申请日：1986-09-09
CPC分类号： H01J29/861 , H01J29/94 , H01J31/124 , H01J2209/385 , H01J2329/00
摘要： In a flat cathode ray display tube having an electron gun (30) adjacent a rear wall (15) of the tube's envelope which produces an electron beam travelling across the rear wall before being turned in the opposite direction and then deflected onto a screen carried by faceplate (14) opposite the rear wall, getter means (60) is situated in one or more recesses (57), each defined at least in part by an elongate rib (55) formed in the rear wall, e.g. by pressing, with the recess wall shielding the getter means directly from the gun to prevent contamination. The rib serves also to strengthen the rear wall. A line scanning deflector (34) is similarly shielded.
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公开(公告)号：EP0214698A3
公开(公告)日：1987-12-23
申请号：EP86201539
申请日：1986-09-09
发明人： Caple, Adrian
CPC分类号： H01J29/023 , H01J31/124
摘要： In a cathode ray display tube including a screen (16) carried on a flat faceplate (14) of an envelope (12) and a channel plate electron multiplier (44) arranged parallel to, and spaced from, the screen (16) having an input side across which an electron beam is scanned and an output side from which a current multiplied beam is directed onto the screen, the multiplier is supported away from the screen by a spacing frame (53) engaging with the periphery of its output side and is clamped against the frame (53) by a pressure member (56) having a plurality of resilient fingers (63) spaced at intervals around the edges of the multiplier and engaging with the input side thereof. In this way, minor local surface profile variations of the multiplier are accomodated. The fingers serve also as contacts for the input side electrode of the multiplier.
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公开(公告)号：EP0113934A3
公开(公告)日：1987-10-14
申请号：EP83201793
申请日：1983-12-15
发明人： Cole, Bernard Victor
IPC分类号： H04N07/06 , H04N09/497
CPC分类号： H04N11/004
摘要： In a wide picture format television transmission system the signals for the scene (1,2,3,4) are transmitted as first and second television signals. The first television signal contains signal information relating to a portion (1, 5, 2, 6) of the scene of standard aspect ratio whilst the second television signal contains signal information relating to the remaining portions (1, 2, 3, 5 and 1, 6, 3, 4) of the scene. The first television signal can be compatible with television signals currently broadcast. In order to enable the first television signal to relate to the area of main interest of the scene it may be derived from a moveable portion between extreme portions (1,2,3,7 to 1, 8, 3, 4) of the scene. In order to correctly combine the information from the first and second television signals at a receiver for a correct wide picture format display the second television signal additionally comprises a component in the form of a steering pulse.
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公开(公告)号：EP0169604A3
公开(公告)日：1987-09-30
申请号：EP85201105
申请日：1985-07-08
IPC分类号： D06F39/02
CPC分类号： D06F39/02
摘要： A liquid-detergent dispenser for a washing machine comprises an open-topped container (8) which can be inserted in the main-wash compartment (3) of the detergent drawer (1) of the machine. In the bottom of the container is an outlet (11) controlled by a valve member (13) which is connected to a float (16) in the form of an air-bell, accommodated in an open-topped float chamber (17). Liquid detergent deposited in the container (8) is retained therein by the valve member (13) until the water is added. Water then enters the float chamber (17) as well s the container and the float (16) is thereby raised to unseat the valve member and allow the water and detergent to flow through the outlet (11) into the compartment (3) and thence into the washing machine. When the supply of water is terminated, water is syphoned from the float chamber through an outlet (24) in the bottom of the chamber and a further outlet (28) in the bottom of the container. This allows the float to descent and reseat the valve member to close the main outlet (11) of the container. Instead of being made for insertion in a compartment of a detergent drawer, the dispenser may be constructed as a permanent part of a detergent drawer.
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