Low noise amplifier
AssigneesSKAIChips Co., Ltd., Reseawrch & Business Foundation SUNGKYUNKWAN UNIVERSITY
InventorsKang Yoon Lee, Behnam Samadpoor Rikan, Young Gun Pu, Jong Wan Jo
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Abstract
Disclosed is a technology related to a low noise amplifier applied between an RF receiver and an RF switch. A phase difference matching circuit having the same phase difference as a positive gain amplifier is added to an output terminal of an attenuator of a low noise amplifier having a variable gain switching structure. In addition, a variable impedance circuit connected to an output terminal of the positive gain amplifier and an output terminal of a phase difference matching unit to finely adjust the phase difference of each output terminal may be further included.
Claims5
A low noise amplifier, comprising:
- a controller configured to detect a power level of an input RF signal and output a corresponding switching control signal;
- an RF switch configured to switch the input RF signal according to the switching control signal;
- a positive gain amplifier connected to the RF switch and configured to amplify the input RF signal and output the amplified RF signal;
- an attenuator connected to the RF switch and configured to attenuate the input RF signal and output the attenuated RF signal;
- and
- a phase difference matching unit connected to an output of the attenuator and implemented as a circuit having the same phase difference as the positive gain amplifier,
- wherein both the phase difference matching unit and the positive gain amplifier include a common source amplifier that generates a 180 degree phase difference.
Dependencies are inferred from the claim text.