Accurate current mirror circuit in low voltage headroom applied to laser drivers

This invention provides an accurate current mirror circuit in a low voltage headroom applied to common-anode laser drivers, including a reference current detection unit, a tail current source unit, and a control unit. The reference current detection unit generates a bias voltage and a reference volt...

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Bibliographic Details
Main Authors Zou, Hehong, Li, Zhuoyuan, Cao, Tianlin, Lou, Jie
Format Patent
LanguageEnglish
Published 25.08.2020
Subjects
BASIC ELECTRIC ELEMENTS
CONTROLLING
DEVICES USING STIMULATED EMISSION
ELECTRICITY
PHYSICS
REGULATING
SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
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Summary:This invention provides an accurate current mirror circuit in a low voltage headroom applied to common-anode laser drivers, including a reference current detection unit, a tail current source unit, and a control unit. The reference current detection unit generates a bias voltage and a reference voltage according to a reference current from the reference current source; the tail current source unit receives the bias voltage and generate a mirror current accordingly; the control unit receives the reference voltage and an output voltage corresponding to the mirror current and carry out a feedback regulation to the bias voltage accordingly. In this invention, the reference voltage and the output voltage are locked at same level, and then the bias voltage is mirrored to generate the mirror current outputted to the laser, thus avoiding the problem of inaccurate current output caused by the offset of the control unit in the low voltage headroom.
Bibliography:Application Number: US201916246572