Patent application number | Description | Published |
20110163810 | Low distortion cascode amplifier circuit - An audio amplifier circuit has a first cascode stage configured as a voltage gain stage and having an input for an audio signal, and an output. The circuit has a second cascode stage configured as a unity gain or near unity gain stage and having an input to receive an output from the first cascode stage, and a low impedance output to drive an output stage of an audio power amplifier. The first cascode stage has a first, input transistor having an input biased to a predetermined bias voltage, and a second, output transistor arranged to drive the second cascode stage. The first, input transistor of the first cascode stage may have a common-emitter configuration, and the second, output transistor may have a common-base configuration. The invention extends to an audio amplifier which includes a circuit of the invention. | 07-07-2011 |
20110164766 | Ribbon loudspeaker module and amplifier therefore - A ribbon loudspeaker module includes a ribbon element of electrically conductive material and having a resistance of less than 1Ω and a magnetic system arranged to create a magnetic field about the ribbon element. A buffer amplifier having an input is arranged to receive a loudspeaker drive signal from an audio power amplifier and an output arranged to drive the ribbon element directly. The ribbon loudspeaker module is preferably a low frequency module, designed to handle audio signals below 5 kHz, and preferably in the range 20 Hz to 3 kHz or a part thereof. The ribbon element may have a resistance of less than 0.5Ω, less than 0.2Ω and even as little as 0.15Ω or less. | 07-07-2011 |
20110175583 | High voltage regulated power supply - A regulated power supply circuit includes a voltage reference circuit arranged to generate a reference voltage and an output device responsive to a control signal to supply a load from a voltage source. A control circuit is arranged to compare an output voltage at the load with the reference voltage. The control circuit includes a comparator comprising a long-tailed transistor pair having a first input to which the reference voltage is applied, a second input to which the output voltage is applied, and an output connected to an input terminal of the output device. The control circuit applies a correction signal to the output device via a single semiconductor junction to regulate the output voltage, thereby minimising propagation delay in the control circuit. The circuit may include a primary voltage regulator arranged to supply the control circuit at a lower voltage than that of the voltage source. | 07-21-2011 |
Patent application number | Description | Published |
20080250699 | Production of Near Zero Aromatics Containing Diesels - The invention provides a process for the production of synthetically derived diesel and diesel produced by the process. The process includes the steps of catalytic conversion of Fisher-Tropsch derived light olefins to distillates (COD) over a zeolite type catalyst at pressures of more than 50 barg, one step hydrotreating the COD product to simultaneously hydrogenate both olefins and aromatics, and collecting a hydrotreated fraction boiling between about 180° C. to 360° C. | 10-16-2008 |
20080250704 | Synthetically Derived Illuminating and Heating Paraffin Oil - The invention provides synthetically derived distillate kerosene produced by catalytic conversion of Fisher-Tropsch derived light olefins to distillates (COD) and hydrotreating thereof. The kerosene boils in the range of about 170 to 250° C. and includes less than 10% n-paraffins, more than 75% iso-paraffins and less than 1% aromatics. | 10-16-2008 |
20080257783 | Process for Catalytic Conversion of Fischer-Tropsch Derived Olefins to Distillates - The invention provides a low aromatic producing process for catalytical conversion of Fisher-Tropsch derived olefins to distillates (COD), which process includes the step of contacting Fisher-Tropsch derived olefins with a zeolyte type catalyst at pressures of more than 50 barg. | 10-23-2008 |
20090294329 | PROCESS FOR CATALYTIC CONVERSION OF FISCHER-TROPSCH DERIVED OLEFINS TO DISTILLATES - The invention provides a low aromatic producing process for catalytical conversion of Fisher-Tropsch derived olefins to distillates (COD), which process includes the step of contacting Fisher-Tropsch derived olefins with a zeolyte type catalyst at pressures of more than 50 barg. | 12-03-2009 |
20100210737 | SYNTHETICALLY DERIVED ILLUMINATING AND HEATING PARAFFIN OIL - The invention provides synthetically derived distillate kerosene produced by catalytic conversion of Fisher-Tropsch derived light olefins to distillates (COD) and hydrotreating thereof. The kerosene boils in the range of about 170 to 250° C. and includes less than 10% n-paraffins, more than 75% iso-paraffins and less than 1% aromatics. | 08-19-2010 |