Aspects of the disclosure relate to devices, wireless communication apparatuses, methods, and circuitry implementing a low noise amplifier (LNA) with phase-shifting circuitry to achieve a continuous phase at the output of the LNA. One aspect is an amplifier including a high gain active path comprising active circuitry, and a low gain path comprising passive circuitry and phase-shifting circuitry. In one or more aspects, the phase-shifting circuitry is configured to shift a phase of an input signal within the low gain path such that the phase of an output signal outputted from the low gain path approximately matches a phase of an output signal outputted from the high gain active path. In at least one aspect, a gain of the high gain active path is higher than a gain of the low gain passive path.

An amplification circuit includes a first switching circuit that includes input terminals and first and second output terminals and that puts the second output terminal into an open state with respect to the input terminals while selectively putting the first output terminal into a state of being connected to any of the input terminals or selectively puts the second output terminal into a state of being connected to any of input terminals while putting the first output terminal into a state of being open with respect to the input terminals, a matching network that is connected to the first output terminal, an amplifier that is connected to an output side of the matching network, a second switching circuit that is connected to an output side of the amplifier, and a bypass path that electrically connects the second output terminal and an output terminal of the second switching circuit.

An amplification circuit includes a first signal terminal, a second signal terminal, a first path, and a second path. The first path is coupled between the first signal terminal and the second signal terminal. The second path is coupled to be in parallel with at least a portion of the first path. The first path includes an input matching network, a first amplifier, and a first switch unit. A first terminal of the input matching network is coupled to the first signal terminal. An input terminal of the first amplifier is coupled to a second terminal of the input matching network. A first terminal of the first switch unit is coupled to a second terminal of the input matching network, and a second terminal of the first switch unit is coupled to a first reference voltage terminal. When the second path is enabled, the first switch unit is turned on.

A receiver front end amplifier capable of receiving and processing intraband non-contiguous carrier aggregate (CA) signals using multiple low noise amplifiers (LNAs) is disclosed herein. A cascode having a common source configured input FET and a common gate configured output FET can be turned on or off using the gate of the output FET. A first switch is provided that allows a connection to be either established or broken between the source terminal of the input FET of each LNA. Further switches used for switching degeneration inductors, gate capacitors, and gate to ground capacitors for each leg can be used to further improve the matching performance of the invention.

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.