Calibration of a resistor in a current mirror circuit
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United States of America Patent
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Jan 2, 2018
Grant Date -
Dec 14, 2017
app pub date -
Jun 13, 2016
filing date -
Jun 13, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A reference stage includes a first transistor, a second transistor and a resistor that are connected in series from a voltage rail to a reference load. The resistor has (i) a resistance that is a function of a digital resistance-controlling value, (ii) a first terminal coupled to a gate of the first transistor, and (iii) a second terminal that has a voltage VG2 and is coupled to a gate of the second transistor. A comparator has a first input that is coupled to the resistor's second terminal. A diode-connected reference transistor is connected from the voltage rail to the comparator's second input to apply a voltage VD at the second input. An adjusting circuit adjusts the digital resistance-controlling value to cause VG2 to approach VD until the comparator's output changes state when VG2 reaches VD.
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