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An armor with rollers is provided that enables a user to move in all positions by rolling on a hard and smooth surface while constantly varying his bearing points on the ground.
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| Number | Title | Issue Date |
| 5889864 | Data transmission systems In a data transmission system in which a cyclic redundancy checksum value is derived in respect of each block of data bit values to be transmitted over the system, the checksum value in respect of blocks of data bit values intended for preselected ones on... | 03/30/1999 |
| 5874862 | Phase-locked loops having two amplifiers for driving a vco A phase-locked loop employing a charge pump 7 for synthesizing RF channels permits a low supply voltage to be used by using two amplifier stages 5a, 5b, between the charge pump and a VCO4. Stage 5a may be a high impedance common emitter pair of complement... | 02/23/1999 |
| 5847605 | Folded active filter A filter circuit comprises three stages 260, 270, 280, each having a differential input and a differential output. The output of stage 260 serves as the input of stage 270 and the output of stage 270 serves as the input of stage 280 respectively. Stage 26... | 12/08/1998 |
| 5821903 | Conformal antenna for wireless local area network transceivers In a transceiver for a WLAN having a two-part folding housing of electrically insulating material, one part having a shielded compartment for the radio circuitry, there is provided a two-part strip-conductor antenna conforming with the outer surface of th... | 10/13/1998 |
| 5815214 | Oscillatory signal generator arrangement An arrangement for synchronizing a digitally generated color subcarrier signal to the color burst signal from another video signal, such as that from a video casette recorder or from a cable television signal, in a manner that allows a line locked clock t... | 09/29/1998 |
| 5812023 | Voltage offset compensation circuit A voltage offset compensation circuit for a high gain amplifier having a fixed input voltage offset, includes sample and hold circuitry for periodically sampling the offset voltage and gain error voltage of the amplifier, and holding the sampled voltage; ... | 09/22/1998 |
| 5793264 | LAN equalizer An equaliser circuit arrangement for compensating for the frequency-dependent characteristics of a transmission line such as an untwisted pair, for lines of lengths up to, say, 125 meters and at data rates up to, say, 155MBits/sec., in which signals from ... | 08/11/1998 |
| 5764070 | Structure for testing bare integrated circuit devices A test probe structure for making connections to a bare integrated circuit device or a wafer to be tested comprises a multilayer printed circuit probe arm which carries at its tip an MCM-D type substrate having a row of microbumps on its underside to make... | 06/09/1998 |
| 5760641 | Controllable filter arrangement A controllable filter arrangement comprises a filter network for filtering an input signal of the filter arrangement, and a transistor, the transistor being configured as a voltage-follower having a controllable current source in its output circuit for pr... | 06/02/1998 |
| 5757323 | Antenna arrangements A microstrip patch or slot radiating element is coupled to a dielectric rod antenna by way of a tapered tubular dielectric guide formed integrally with the rod. An array of radiating elements may be formed on a common substrate, and the dielectric guide/r... | 05/26/1998 |
| 5747870 | Multi-chip module inductor structure In a multichip module structure comprising a silicon, alumina or sapphire substrate carrying a plurality of layers of metallisation separated by polymer dielectric layers, with one or more inductors formed in the uppermost metallisation layer, a ferrite c... | 05/05/1998 |
| 5734440 | White clip circuit A white clip circuit, formed as an integrated circuit, includes a negative impedance converter which in use is operative to increase the sensitivity of an inverting long-tailed pair of transistors adapted to invert the signals and feed them back to the in... | 03/31/1998 |
| 5734273 | Phase lock detector A phase lock detector for a digital phase locked loop frequency synthesiser in which phase errors, represented by phase error pulses of a duration equal to the relative time displacement of synthesised and reference waveforms in the phase locked loop, are... | 03/31/1998 |
| 5717245 | Ball grid array arrangement A ball grid array arrangement comprises a dielectric multilayer substrate, in a lower metallization layer of which is disposed an array of solder balls. A passive circuit element is integrated into at least one of the metallization layers. The arrangement... | 02/10/1998 |
| 5684433 | Dual-feedback amplifier circuit arrangements In an amplifier circuit arrangement in which series resistive feedback is utilized in the main amplifier to minimize distortion, and a feedback amplifier is provided in a path from the output of the arrangement to the series feedback path effectively to b... | 11/04/1997 |
| 5684760 | Circuit arrangement for measuring a time interval A circuit arrangement for measuring a time interval by evaluating the number of complete cycles, and/or the fraction of a cycle, of a ring oscillator that occur(s) during the time interval to be measured, in which there are provided means to avoid a count... | 11/04/1997 |
| 5677698 | Slot antenna arrangement for portable personal computers An antenna arrangement is provided in which a slot antenna is attached to the surface of an equipment case made of a dielectric material, there being provided also a ground plane spaced a small distance apart from the case and behind the antenna. The equi... | 10/14/1997 |
| 5663989 | Control arrangements for digital radio receivers In a frequency modulated digital radio transmission system, frequency differences between transmitter and receiver which give rise to DC offsets at the output of the demodulator are countered for any one data transmission by establishing a frequency contr... | 09/02/1997 |
| 5661754 | Receiver arrangement An infrared remote-control receiver employs at its front end a gyrator-configured transistor operating as a current-to-voltage converter, but derives its data information from a negative-going gyrator output pulse in preference to the more conventionally ... | 08/26/1997 |
| 5619248 | Video signal distribution system microwave radio link for transmitting double sideband phase modulated carrier signal In a video signal distribution system in which a plurality of video signals are modulated onto individual carrier signals spaced over a band of frequencies to form a composite signal for transmission over cables of the system, a point-to-point radio link ... | 04/08/1997 |
| 5612976 | Detectors A direct conversion Binary FSK radio receiver has an AFC loop comprising an Exclusive-Or phase detector 104 responsive to the I3 and Q3 signals. I and Q filters 100, 101 are not identical but have different frequency-phase characteri... | 03/18/1997 |
| 5604658 | Trimmable capacitor In a multilayer metallisation/dielectric structure on a silicon substrate a trimmable capacitor is formed between two of the higher metallisation layers, with one layer being segmented and the individual segments connected by way of one or more vias and r... | 02/18/1997 |
| 5587713 | Radar transmitter/receivers A radar transmitter/receiver arrangement for use, for example, in automotive vehicle control in which R.F. energy from a frequency modulated oscillator is applied to an antenna for transmission and to one input of a mixer by way of a rat-race device, and ... | 12/24/1996 |
| 5587681 | DC restoration circuit In a D.C. restoration circuit for a digital FM radio receiver, in which demodulated signals may be presented at the output of the demodulator as low-level differential signals superimposed on a variable D.C. level, the differential signal paths are capaci... | 12/24/1996 |
| 5572165 | Amplifier arrangements An amplifier arrangement comprising a plurality of similar amplifier stages to which input signal voltages are applied in common, the output signal voltages being summed to retain bandwidth at the expense of gain compared with cascaded stages. The individ... | 11/05/1996 |
| 5568345 | Overvoltage protection circuit An overvoltage protection circuit employs a series of semiconductor switching elements, each element having a control terminal and two main conduction terminals, in a totem pole configuration and two potential dividers whose tapping points feed, respectiv... | 10/22/1996 |
| 5563617 | Doppler microwave sensor A Doppler microwave sensor for a vehicle alarm employs a mixer stage and a signal-processing stage on a printed circuit board, the printed circuit board having a ground plane containing a slot antenna which is coupled to the mixer stage. The ground plane ... | 10/08/1996 |
| 5557640 | Phase and amplitude equalization arrangement An equalisation arrangement compensates for multipath phase and amplitude distortion effects in a transmission channel by first measuring such distortion effects as they occur over time in a calibration phase, thereby obtaining phase and amplitude compens... | 09/17/1996 |
| 5555016 | Video signal distribution system In a video signal distribution system in which a plurality of video signals are modulated onto individual carrier signals spaced over a band of frequencies to form a composite signal for transmission over cables of the system, a point-to-point radio link ... | 09/10/1996 |
| 5543979 | Preamplifier circuit arrangements for common current flow in a transducer A preamplifier circuit arrangement for a magnetic or magneto resistive transducer, such as a record/replay head, in which a cascode preamplifier stage, and a stage providing a floating reference voltage for a following amplifier, are linked by an emitter ... | 08/06/1996 |
| 5530723 | Automatic frequency control arrangement An automatic frequency control (AFC) arrangement for use in a symmetrically modulated, homodyne FSK receiver or transceiver forms a value representing the baseband frequency for each of demodulated data states "1" and "0" by measuring the frequency (54, 5... | 06/25/1996 |
| 5508476 | Mounting arrangement for semiconductor devices An arrangement for making fatigue-free external connections to a device mounted on a direct copper bonded substrate, in which one or more connector tubes are brazed to respective copper areas on the substrate before the device is mounted on the substrate,... | 04/16/1996 |
| 5500823 | Memory defect detection arrangement In a static random access memory made up of six-transistor memory cells arranged in rows and columns, an arrangement for detecting open circuit or "soft" defects in the individual inverters of a memory cell includes lowering the supply voltage of a cell u... | 03/19/1996 |
| 5495382 | Contents addressable memory A contents addressable memory comprising an array of contents addressable memory cells arranged in rows and columns, each row of the array having a respective case between address bit values of a data word or words to be retrieved from the memory and bit ... | 02/27/1996 |
| 5469093 | Current mirror drive circuit with high breakdown voltage A drive circuit comprises a plurality of current mirrors connected in series at their output-current end with a load resistor between two power rails. The input halves of the mirrors are driven by respective groups of series-connected input transistors, t... | 11/21/1995 |
| 5469378 | Content addressable memory having match line transistors connected in series and coupled to current sensing circuit In a contents addressable memory for a fully associative cache memory in which address bit values in respect of data to be retrieved from cache are applied to the bit lines of respective columns of cells for comparison with the bit values held by the cell... | 11/21/1995 |
| 5469118 | Integrated oscillator circuits A stable sine wave oscillator circuit comprising two pairs of cross-coupled bipolar transistors in cascode, the collector electrodes of the transistors of each pair being interconnected by way of respective capacitors. Output signals in phase quadrature m... | 11/21/1995 |
| 5467093 | Logarithmic detector A logarithmic detector having a first input line linked to the base of the first transistor, a second line linked to the base of the second transistor, a third input line linked to the bases of third and fourth transistors, a fourth input line linked to t... | 11/14/1995 |
| 5467312 | Random access memory A current sensing read arrangement for a static random access memory in which critical nodes in the sensing arrangement are equalised before read-out commences, and in which differential outputs are applied to a gating arrangement which terminates the rea... | 11/14/1995 |
| 5463409 | Tracker balls A trackerball arrangement includes a ball rotatably mounted with respect to a housing; a plurality of supports arranged to locate the ball in a predetermined operable position relative to the housing, at least one of the supports being mounted for movemen... | 10/31/1995 |
