Texas Instruments Corporation

Venkata Ramanan

Anand Ganesh Dabak

Nitin Kumar Agarwal

Kunal Suresh Karanjkar

A method of calculating a time difference is disclosed. The method includes sampling a first ultrasonic signal (r) to produce a first sampled signal (y(i)) and sampling a second ultrasonic signal (r) to produce a second sampled signal (y(i)). A first time (LEAD_LAG) is determined between a time the first sampled signal crosses a threshold () and a time the second sampled signal crosses the threshold. The first sampled signal is cross correlated with the second sampled signal to produce a second time (SAMP_OFFSET). The time difference is calculated in response to the first and second times.

Extended range ADC flow meter

Enhanced operational amplifier trim circuitry and techniques are presented herein. In one implementation, a circuit includes a reference circuit configured to produce a set of reference voltages, and a digital-to-analog conversion (DAC) circuit. The DAC circuit comprises a plurality of transistor pairs, where each pair among the plurality of transistor pairs is configured to provide portions of adjustment currents for an operational amplifier based at least on the set of reference voltages and sizing among transistors of each pair. The circuit also includes drain switching elements coupled to drain terminals of the transistors of each pair and configured to selectively couple one or more of the portions of the adjustment currents to the operational amplifier in accordance with digital trim codes.

Low power operational amplifier trim offset circuitry

A method of calculating a time difference is disclosed. The method includes sampling a first ultrasonic signal (r) to produce a first sampled signal (y1()) and sampling a second ultrasonic signal (r) to produce a second sampled signal (y2()). A first time (LEAD_LAG) is determined between a time the first sampled signal crosses a threshold (&#x3b8;1) and a time the second sampled signal crosses the threshold. The first sampled signal is cross correlated with the second sampled signal to produce a second time (SAMP_OFFSET). The time difference is calculated in response to the first and second times.

A method of calculating a time difference is disclosed. The method includes receiving a first ultrasonic signal (r) from a first transducer (UT) and receiving a second ultrasonic signal (r) from a second ultrasonic transducer (UT). The first and second ultrasonic signals are sampled to produce respective first and second sampled ultrasonic signals (). Points having a value greater than a first threshold are selected from the first and second sampled ultrasonic signals (). A difference in travel time between the first and second ultrasonic signals is calculated () in response to the selected points.

A method of calculating a time difference is disclosed. The method includes sampling a first ultrasonic signal (r) to produce a first sampled signal (y()) and sampling a second ultrasonic signal (r) to produce a second sampled signal (y()). A first time (LEAD_LAG) is determined between a time the first sampled signal crosses a threshold (&#x3b8;) and a time the second sampled signal crosses the threshold. The first sampled signal is cross correlated with the second sampled signal to produce a second time (SAMP_OFFSET). The time difference is calculated in response to the first and second times.

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Venkata Ramanan