An amplifier circuit has an amplification path including an amplifier and a bypass path configured to bypass at least the amplifier. The bypass path includes a switch coupled in series on the bypass path and another switch coupled in series between the bypass path and ground. The amplification path further includes an inductor coupled on an output side with respect to the amplifier and a switch coupled between the inductor and ground on a path between the inductor and the amplifier.

An amplifier includes a first circuitry, a second circuitry, and a plurality of amplifier circuitries. The first circuitry controls an enable signal. The second circuitry controls a bias signal. Circuitries which output signals are decided from among the plurality of circuitries based on the enable signal, and each of the circuitries which output the signals amplifies an input signal with a gain corresponding to the bias signal.

Methods and devices addressing design of reconfigurable wideband LNAs to meet stringent gain, noise figure, and linearity requirements with multiple gain modes are disclosed. The disclosed teachings can be used to reconfigure RF receiver front-end to operate in various applications imposing stringent and conflicting requirements, such as 5G NR radios. Wideband and narrowband input and output matching with gain modes using a combination of the same hardware and a switching network are also disclosed.

Circuits and methods for a radio frequency amplifier, such as an LNA, that include a wideband coupled input impedance matching network. One embodiment includes a first inductor coupled between a first terminal and a first node, the first terminal couplable to a degeneration terminal of an amplifier core; a second inductor coupled between a second terminal and either the first node or a second node, the second terminal couplable to an input terminal of the amplifier core; a third inductor coupled between the first node and a third terminal, the third terminal couplable to a reference potential; and, in a variant embodiment, a fourth inductor coupled between the second node and a fourth terminal, the fourth terminal couplable to the reference potential; wherein the first inductor and the second inductor are mutually coupled. Some embodiments allow multiple modes to allow tradeoffs of gain versus linearity and NF characteristics.

A power amplifier circuit includes N-stage power amplifiers connected in series, provided with an input end receiving a RF input signal and an output end outputting a RF output signal. In the N-stage power amplifiers, an output end of N-M stage power amplifiers and an output end of a final stage amplifier are grounded through their respective frequency doubling suppression circuits which are configured to suppress frequency doubling of the N-stage power amplifiers during operation, and N is an integer greater than or equal to 2.

A receiver circuit is disclosed. The receiver circuit includes an amplifier configured to generate an RF signal based on a received signal, where the RF signal includes an information signal and a blocker signal modulating an RF carrier frequency. The receiver circuit also includes an RF filter connected to the amplifier, where the RF filter is configured to selectively attenuate the blocker signal.

A transmitter device which transmits a first transmit signal and a second transmit signal having different wireless communication standards. The transmitter device includes a power amplifier that amplifies the first transmit signal in a first transmission mode. A first impedance circuit provides the amplified first transmit signal to a radio frequency output port. A second impedance circuit is connected to the first impedance circuit and provides an additional impedance to the first impedance circuit in the first transmission mode. A first switch provides the second transmit signal to the first impedance circuit in a second transmission mode. A second switch connects the second impedance circuit and a ground in the first transmission mode, and floats the second impedance circuit in the second transmission mode.

A front end module (FEM) integrated circuit (IC) architecture that uses the same LNA in each of several frequency bands extending over a wide frequency range. In some embodiments, switched impedance circuits distributed throughout the front end circuit allow selection of the frequency response and impedances that are optimized for particular performance parameters targeted for a desired device characteristic. Such switched impedance circuits tune the output and input impedance match and adjust the gain of the LNA for specific operating frequencies and gain targets. In addition, adjustments to the bias of the LNA can be used to optimize performance trade-offs between the total direct current (DC) power dissipated versus radio frequency (RF) performance. By selecting appropriate impedances throughout the circuit using switched impedance circuits, the LNA can be selectively tuned to operate optimally at a selected bias for operation within selected frequency bands.

Amplification device and processes capable of miniaturization in a device for performing linear amplification and switching amplification operations on incoming signals are provided. The amplifying device includes a first amplifying unit for amplifying an input signal and outputting a first output signal, the input switch unit connected in parallel with the first amplifying unit for performing a switching operation by an input signal and outputting a switch output signal, and a second amplifying unit for amplifying a first output signal or a switch output signal and outputting a second output signal, and the first amplifying unit or the input switch unit operates based on the type of the input signal.

A radio-frequency circuit includes a first switch which includes a common terminal, a first selection terminal, and a second selection terminal, and switches between connecting the common terminal and the first selection terminal and connecting the common terminal and the second selection terminal; a first low-noise amplifier including an input terminal connected to the first selection terminal, and a second low-noise amplifier including an input terminal connected to the second selection terminal. The frequency band in which the first low-noise amplifier amplifies a radio-frequency signal by at least a predetermined gain includes the frequency band in which the second low-noise amplifier amplifies a radio-frequency signal by at least a predetermined gain.