Amplifying device with bias timing control circuit based on duty cycle
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United States of America Patent
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Nov 16, 2021
Grant Date -
Nov 19, 2020
app pub date -
Oct 16, 2019
filing date -
May 17, 2019
priority date (Note) -
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Abstract
A bias timing control circuit includes a current source, a bias switch circuit, a duty cycle sensing circuit, and a switching control circuit. The bias switch circuit includes a first path switch, connected between an output node of the current source and a bias amplifying circuit, and a second path switch, connected between the output node of the current source and a temperature compensation circuit. The duty cycle sensing circuit is configured to generate a timing control signal based on a duty cycle of a transmission enable signal. The switching control circuit is configured to control a first turn-on time of the first path switch during an initial startup period, and a second turn-on time of the second path switch during a normal driving period subsequent to the initial startup period to adjust a warm-up time of a power amplifying circuit based on the timing control signal.
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