Patent application number | Description | Published |
20090284304 | CIRCUIT FOR GENERATING A TEMPERATURE-COMPENSATED VOLTAGE REFERENCE, IN PARTICULAR FOR APPLICATIONS WITH SUPPLY VOLTAGES LOWER THAN 1V - An embodiment of a circuit is described for the generation of a temperature-compensated voltage reference of the type comprising at least one generator circuit of a band-gap voltage, inserted between a first and a second voltage reference and including an operational amplifier, having in turn a first and a second input terminal connected to an input stage connected to these first and second input terminal and comprising at least one pair of a first and a second bipolar transistor for the generation of a first voltage component proportional to the temperature. The circuit also comprises the control block connected to the generator circuit of a band-gap voltage in correspondence with at least one first control node which is supplied with a biasing voltage value comprising at least one voltage component which increases with the temperature for compensating the variations of the base-emitter voltage of the first and second bipolar transistors and ensure the turn-on of a pair of input transistors of the operational amplifier. The circuit has an output terminal suitable for supplying a temperature-compensated voltage value obtained by the sum of the first voltage component proportional to the temperature and of a second component inversely proportional to the temperature. | 11-19-2009 |
20110069554 | SENSE-AMPLIFIER CIRCUIT FOR NON-VOLATILE MEMORIES THAT OPERATES AT LOW SUPPLY VOLTAGES - A sense-amplifier circuit includes: a comparison stage that compares a cell current that flows in a memory cell and through an associated bitline, with a reference current, for supplying an output signal indicating the state of the memory cell; and a precharging stage, which supplies, during a precharging step prior to the comparison step, a precharging current to the bitline so as to charge a capacitance thereof. The comparison stage includes a first comparison transistor and by a second comparison transistor, which are coupled in current-mirror configuration respectively to a first differential output and to a second differential output, through which a biasing current flows. The precharging stage diverts, during the precharging step, the biasing current towards the bitline as precharging current, and allows, during the comparison step, passage of part of the biasing current towards the first differential output, enabling operation of the current mirror. | 03-24-2011 |
20110102049 | CIRCUIT FOR GENERATING A REFERENCE VOLTAGE WITH COMPENSATION OF THE OFFSET VOLTAGE - An embodiment of a circuit includes first and second branches, an amplifier, a compensation circuit, and a bias unit. The first and second branches are respectively operable to generate first and second currents. The amplifier has a first amplifier input node coupled to the first branch, a second amplifier input node coupled to the second branch, an amplifier output node coupled to the first and second branches, and a first compensation node. The compensation unit is operable to provide a first offset-compensation signal to the first compensation node. And the first bias unit is operable to provide first and second bias signals to the first and second input nodes, respectively, such that the amplifier is operable to cause the first current to approximately equal the second current. | 05-05-2011 |
20110102058 | CIRCUIT FOR GENERATING A REFERENCE VOLTAGE - An embodiment of a bandgap voltage reference circuit for generating a bandgap voltage reference. Said embodiment comprises a current generator controlled by a first driving voltage for generating a first current depending on the driving voltage, and a first reference circuit element coupled to the controlled current generator for receiving the first current and generating a first reference voltage in response to the first current. The circuit further comprises a second reference circuit element for receiving a second current corresponding to the first current; said second reference circuit element is adapted to generate a second reference voltage in response to the second current. Said circuit further comprises a third reference circuit element for receiving a third current corresponding to the first current and generating the bandgap reference voltage in response to the third current, and an operational amplifier. The operational amplifier has a first input terminal coupled to the first circuit element for receiving a first reference voltage input based on the first reference voltage, a second input terminal coupled to the second reference circuit element for receive a second input voltage based on the second reference voltage and an output terminal coupled to the controlled current generator to provide the first driving voltage to the current generator according to the difference between the first input voltage and the second input voltage. The circuit also comprises a control circuit comprising first capacitive means and second capacitive means. The first capacitive means have a first terminal coupled to the first reference circuit element to receive the first reference voltage and a second terminal coupled to the first input terminal to provide the first input voltage. The second capacitive means comprise a first terminal coupled to the second reference circuit element for receiving the second reference voltage and a second terminal coupled to the second input terminal to provide the second input voltage. The control circuit also comprises biasing means to selectively provide a common-mode voltage to the second terminals of the first and second capacitive means. | 05-05-2011 |
20120217947 | DC-DC DOWN-CONVERTER WITH TIME CONSTANT COMPARISON REGULATION SYSTEM - A voltage converter device includes a voltage regulator having a supply terminal for receiving a supply voltage and an output terminal for providing a regulated voltage. A voltage multiplier is for receiving the regulated voltage and providing a boosted voltage higher in absolute value than the regulated voltage. The voltage multiplier includes circuitry for providing a clock signal that switches periodically between the regulated voltage and a reference voltage, and a sequence of capacitive stages that alternately accumulate and transfer electric charge according to the clock signal for generating the boosted voltage from the regulated voltage. The voltage regulator includes a power transistor and a regulation transistor each having a first conduction terminal, a second conduction terminal and a control terminal. | 08-30-2012 |
20130272068 | MANAGING OF THE ERASING OF OPERATIVE PAGES OF A FLASH MEMORY DEVICE THROUGH SERVICE PAGES - A method for managing a flash memory device including pages of memory cells is described. The memory device may be erasable at the page level, and the pages may include operative pages for storing operative values and service pages for storing information relating to the erasing of the operative pages. In response to a request to erase selected operative pages, the method may include determining a service page in use among the service pages according to service information stored in the service pages, verifying the presence a service page to be erased, and applying an erasing pulse to each service page to be erased. The method may also include writing an address of the operative pages into the service page in use, erasing the selected operative pages, and writing a completion indication of the erasing of the selected operative pages into the service page in use. | 10-17-2013 |