Current modulation circuit
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United States of America Patent
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Feb 14, 2017
Grant Date -
Nov 12, 2015
app pub date -
May 6, 2014
filing date -
May 6, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A modulated digital input signal is passed through a conditioning circuit to generate a first input signal. An error amplifier circuit receives the first input signal and a second input signal, and controls the operation of a MOS transistor to generate an output signal that is current modulated. The output signal is sensed to generate a feedback signal. A switching circuit selectively applies the feedback signal as the second input signal in response to a transition of the modulated digital input signal from a first logic state to a second logic state. The switching circuit alternatively selectively applies a fixed reference signal as the second input signal to the error amplifier in response to a transition of the modulated digital input signal from the second logic state to the first logic state.
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