Input current trim for chopper operational amplifier
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United States of America Patent
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Apr 16, 2024
Grant Date -
Apr 20, 2023
app pub date -
Oct 14, 2021
filing date -
Oct 14, 2021
priority date (Note) -
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Abstract
In examples of a chopper operational amplifier, a current control circuit comprises a pair of voltage sources, each of which may be varied to generate a voltage signal of a particular value, and multiple inverters, each of which is configured to receive either a clock signal or its complement signal and one of the voltage signals. Based on these inputs, each inverter generates a control signal that is delivered to a corresponding switch in the input stage of the chopper operational amplifier to control the gate voltage of that switch. Based on the difference between the values of the voltage signals, the current control circuit operates to reduce the amplitudes of base currents induced by charge injection at the input terminals of the chopper operational amplifier.
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