System and method of automatic power control system and bias current control circuit
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United States of America Patent
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Feb 19, 2019
Grant Date -
Dec 21, 2017
app pub date -
Oct 31, 2016
filing date -
Jun 16, 2016
priority date (Note) -
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Abstract
A bias-current-control circuit is provided. The bias-current-control circuit includes a transconductance circuit, a constant-current source, and a current-mirror circuit. The transconductance circuit is connected to a node and detects a voltage signal to generate a first current. The constant-current source is connected to the node and generates a tail current. The current-mirror circuit includes a reference current terminal and a bias current terminal, and the reference current terminal is coupled to the node. A second current which flows through the reference current terminal is determined by a current difference between the tail current and the first current. A bias current which flows through the bias current terminal is generated based on the second current. Furthermore, the second current and the bias current are in a predetermined ratio.
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