摘要:
A new approach is disclosed concerning offset cancellation methods in analog to digital converters and analog to digital converters implementing the same. Such approach allows to efficiently cancel offset drifts in analog to digital converters.
摘要:
An energy-efficient capacitance-to-digital converter (CDC) is provided that utilizes a capacitance-domain successive approximation (SAR) technique. Unlike SAR analog-to-digital converters (ADCs), analysis shows that for SAR CDCs, the comparator offset voltage will result in signal-dependent and parasitic-dependent conversion errors, which necessitates an op-amp-based implementation. The inverter-based SAR CDC contemplated herein provides robust, energy-efficient, and fast operation. The inverter-based SAR CDC may include a hybrid coarse-fine programmable capacitor array. The design of example embodiments is insensitive to analog references, and thus achieves very low temperature sensitivity without the need for calibration. Moreover, this design achieves improved energy efficiency.
摘要:
Die Erfindung betrifft eine Messvorrichtung (1) mit wenigstens zwei Messkanälen (2a, 2b), jeder Messkanal (2a, 2b) umfassend einen A/D-Wandler (4a, 4b) für die Umwandlung einer analogen Spannung in einen digitalen Spannungswert, und eine Logikeinheit (5a, 5b), die mit dem A/D-Wandler (4a, 4b) verbunden ist, um den digitalen Spannungswert zu empfangen, wobei wenigstens ein Messkanal (2a, 2b) als sicherer Messkanal (2a, 2b) mit einem Multiplexer (3a, 3b) ausgeführt ist, wobei mit dem Multiplexer (3a, 3b) die analoge Spannung zwischen einer Messspannung (U Mess1 , U Mess2 ) und einer Referenzspannung (U Ref1 , U Ref2 ) umschaltbar ist, und die Logikeinheit (5a, 5b) wenigstens eines anderen Messkanals (2a, 2b) als Referenzerzeuger ausgeführt ist, um die Referenzspannung (U Ref1 , U Ref2 ) bereitzustellen und den Multiplexer (3a, 3b) zwischen der Messspannung (U Mess1 , U Mess2 ) und der Referenzspannung (U Ref1 , U Ref2 ) umzuschalten.
摘要:
Die vorliegende Erfindung betrifft eine Distanzmessmethode und ein elektronisches Laserdistanzmessmodul, insbesondere zur Verwendung in einem Distanzmessgerät, im Speziellen ausgebildet als Lasertracker, Tachymeter, Laserscanner, oder Profiler, zur schnellen Signalerfassung mit einem Analog-Digital-Wandler, wobei eine Kompensation einer Integralen Nichtlinearität des Analog-Digital-Wandlers erfolgt.
摘要:
The present disclosure relates to a method of calibrating a thermometer-code SAR-A/D converter, said thermometer-code SAR-A/D converter comprising a N bit -bit digital-to-analog converter (DAC) for outputting a N bit -bit output code, said digital-to-analog converter (DAC) comprising a first subconverter (C MSB ) having a plurality of N Th thermometer elements T j (1) and a second subconverter (C LSB ) having a plurality of N Bin binary-weighted elements (2), wherein said N bit output code is equal to the sum of N BitTh and N BitBin where N Th = 2^N BitTh and N BitBin is equal to N Bin = N BitBin . The calibration method includes the steps of determining (5) an Integral Non-Linearity error value (µ R ) of a R th thermometer-code level of said thermometer elements T j according to the formula: µ R = ˆ‘ j = 0 R - 1 E j - R N th ˆ‘ j = 0 N th - 1 E j where E j represents the relative differences between said plurality of thermometer elements T j and a reference thermometer element T ref selected from said plurality of thermometer elements T j of said digital-to-analog converter (DAC) - minimizing (6) the maximum of said error value µ R to obtain a minimized error value; - generating (7) said output code (OUTPUT) according to said minimized error.
摘要:
The invention relates to a method for determining a measurement variable (Q), characterized by the following steps: providing a model (M) of a circuit (DAC) having at least one parameter (tau, Imax); actuating the circuit (DAC) by way of a preset signal (H), and detecting values (l1, l2,l3) of a manipulated variable (I) generated by the circuit in n discrete points in time (t1, t2, t3), and determining a value (tauDAC, lmaxDAC) of the at least one Parameter (tau, lmax) on the basis of the detected values (I1, l2, l3) of the manipulated variable (I) generated by the circuit (DAC); detecting values (J1, J2) of a variable (J) influenced by the circuit (DAC) in m discrete points in time (T1, T2), and determining the measurement variable (Q) from the measurement values (J1, J2) of the variable (J) influenced by the circuit (DAC), taking into account the model (M) of the circuit (DAC).