Snoeij
Martijn F. Snoeij, Nuremberg DE
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20110057718 | APPARATUS AND METHOD FOR OFFSET DRIFT TRIMMING - An apparatus is provided that includes a drift trimming stage that includes a first current source providing a current with a first temperature dependency and a second current source providing a current with a second temperature dependency. The first and the second current source are coupled at a first node and configured to have equal currents at a first temperature. There is further a third current source providing a current with a third temperature dependency and a fourth current source providing a current with a fourth temperature dependency. The third current source and the fourth current source are coupled at a second node and configured to have equal currents at the first temperature. There is a first resistor coupled between the first node and a third node, a second resistor coupled between the second node and the third node. The first node and the second node are coupled to provide a combined voltage drop across the first resistor and the second resistor for reducing the offset drift. | 03-10-2011 |
Martijn F. Snoeij, Delft NL
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20090195431 | SINGLE SLOPE ANALOG-TO-DIGITAL CONVERTER - A single-slope ADC, particularly suitable for use in a massive-parallel ADC architecture in a readout circuit of a CMOS imager. A plurality of ramp signals are generated which define non-overlapping sub-ranges of the full input range. For each ADC channel, the sub-range in which the voltage of the input signal falls is determined, and the corresponding ramp signal is selected for use in the A/D conversion. Thus, the speed of the A/D conversion process can be increased and the power consumption decreased. | 08-06-2009 |
Martijn F. Snoeij, Erding DE
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20140184340 | INTEGRATED CIRCUIT FOR USE IN A HYBRID OUTPUT STAGE - This invention generally relates to the technical field of integrated circuits. More specifically the invention relates to output stages for providing an output signal, into which an integrated circuit may be used. An aspect relates to an integrated circuit capable of driving an external class-B output stage in a manner that allows providing a continuous output signal over the full range of desired outputs. The integrated circuit may comprise a class-AB output stage working in conjunction with the class-B output stage so as to provide a hybrid output stage. The integrated circuit may prevent dead band problems commonly faced when employing a class-B output stage. The integrated circuit may also reduce the quiescent current of the hybrid output stage. This may have further advantages, such as for example, the output stage producing less heat/power than needs to be dissipated. | 07-03-2014 |
Martijn Fridus Snoeij, Nuremberg DE
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20120086509 | Amplifier Input Stage and Slew Boost Circuit - Various apparatuses, methods and systems for boosting an amplifier slew rate are disclosed herein. For example, some embodiments of the present invention provide an apparatus including a pair of inputs connected to a pair of differential input devices in an amplifier, a current source, a first current path connected to the current source, a second current path connected to the current source and to the pair of differential input devices, a switch in the first current path, and a voltage difference signal connected between the pair of inputs and the switch. The voltage difference signal represents the voltage difference between the pair of inputs. The conductance of the switch is inversely proportional to the voltage difference signal. | 04-12-2012 |
Martijn Fridus Snoeij, Erding DE
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20150042325 | HYBRID CLOSED-LOOP/OPEN-LOOP MAGNETIC CURRENT SENSOR - Hybrid magnetic current sensors and sensing apparatus are presented with closed-loop and open-loop circuitry employs first and second integrated magnetic sensors to sense a magnetic field in a magnetic core structure gap to provide high accuracy current measurement via a closed-loop magnetic circuit with the first sensor in a nominal current range as well as open-loop current measurement using the second sensor in an extended second range to accommodate over-current conditions in a host system as well as to provide redundant current sensing functionality. | 02-12-2015 |
20150048818 | INTEGRATED FLUXGATE MAGNETIC SENSOR AND EXCITATION CIRCUITRY - Improved magnetic sensor excitation circuitry is presented for providing a periodic bidirectional excitation waveform to a fluxgate magnetic sensor excitation coil using a bridge circuit connected to the excitation coil and having lower transistors for switched selective connection to a current mirror input transistor to mirror a current provided by pulsed current source, and with integrated filtering to control pulse rise times and slew rate. | 02-19-2015 |