Oberhuber

Lukas C. Oberhuber, San Francisco, CA US

Patent application number	Description	Published
20100049600	NETWORK-BASED SWEEPSTAKES SYSTEM AND METHOD - A system and method for automatically enrolling users of a website or other network-based service in sweepstakes. A user of	02-25-2010

Patent application number	Description	Published
20090015332	STARTUP CIRCUIT FOR SUBREGULATED AMPLIFIER - A multi-stage circuit has a first stage powered by the output voltage of a next stage. A current source within the first stage provides a tail current for a differential amplifier within the first stage. When the first stage has an operating voltage high enough for proper operation, this tail current is at a nominal level; if the voltage is too low for proper operation of the first stage, the tail current is below this nominal level. A comparator, which has one input coupled to a node within this current source, a second input coupled to a threshold voltage, and an output coupled to a control node within the next stage, provides an output indicative of whether or not the tail current is substantially at its nominal level. If tail current is too low, the comparator provides a forcing signal to the control node of the next stage which causes the output of the next stage to be at a substantially nominal level regardless of the voltage at its input, thus providing a suitably high voltage for the first stage to begin normal operation. When the tail current reaches its nominal level, the comparator output changes state to one which has little or no effect on the output voltage of the second stage, and normal operation of the overall circuit begins.	01-15-2009

Patent application number	Description	Published
20080290945	CLASS AB OUTPUT STAGE AND METHOD FOR PROVIDING WIDE SUPPLY VOLTAGE RANGE - A class AB output stage includes first (M	11-27-2008
20100033356	CIRCUITS AND METHODS TO MINIMIZE NONLINEARITY ERRORS IN INTERPOLATING CIRCUITS - Circuits and methods to minimize nonlinearity errors in interpolating circuits are described herein. A disclosed example circuit comprises first and second voltage-current converter circuits, each including a first transistor and a second transistor, each having a first electrode configured to receive a signal generated by a corresponding current source, a first current source providing a signal to the first voltage-converter circuit and comprising a first error correction circuit to minimize integral nonlinearity error in the interpolation circuit by setting a first current through the first current source to operate the first voltage-converter circuit in a nominal linear operating mode, and a second current source providing a signal to the second voltage-converter circuit and comprising a second error correction circuit to minimize integral nonlinearity error in the interpolation circuit by setting a second current through the second current source to operate the second voltage-converter circuit in the nominal linear operating mode.	02-11-2010