IMPEDANCE DETECTING AND ADJUSTING CIRCUIT
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United States of America Patent
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Issued Date -
Nov 16, 2017
app pub date -
Nov 1, 2016
filing date -
May 10, 2016
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Abstract
An impedance detecting and adjusting circuit includes an impedance adjusting unit, a frequency band detection source and a controller. The impedance adjusting unit is disposed in a radio frequency front end device. The radio frequency front end device includes one or more than one transmission port. The frequency band detection source is selectively coupled to the target transmission port of the one or more than one transmission port for transmitting the scan signals having different frequencies to the target transmission port to detect a corresponding operating frequency band of the target transmission port. The controller is coupled to the impedance adjusting unit for adjusting the impedance adjusting unit according to the measured operating frequency band and making the target transmission port achieve impedance matching at least in the operating frequency band thereof.
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