The disclosed technology is related to a radio-frequency (RF) amplifier having a bypass circuit and a resonant structure to improve performance in a bypass mode (e.g., a low gain mode). The disclosed amplifiers have a resonant structure that effectively isolates an amplifier core from a bypass circuit. For example, in a bypass mode, the resonant structure is configured to create an open impedance looking into the amplifier core input. This effectively removes any loading from the amplifier core to the bypass circuit. The disclosed amplifiers with resonant structures improve linearity performance in bypass modes due at least in part to the open impedance to the amplifier core provided by the resonant structure.

Regulating voltages at inputs of an electronic device by performing at least the following: receiving, at a voltage monitoring circuit, a monitoring voltage corresponding to a power system, determining, at the voltage monitoring circuit, whether the monitoring voltage is equal to or exceeds a monitoring threshold voltage, receiving, at the voltage monitoring circuit, an output indicating whether an inputted reference voltage and an inputted feedback voltage at a comparator circuit differs, regulating, at the voltage monitoring circuit, a feedback voltage to match the inputted reference voltage based on the output and a determination that the monitoring voltage is equal to or exceeds the monitoring threshold voltage, and providing, from the voltage monitoring circuit, the feedback voltage as an updated inputted feedback voltage for the comparator circuit.

Regulating voltages at inputs of an electronic device by performing at least the following: receiving, at a voltage monitoring circuit, a monitoring voltage corresponding to a power system, determining, at the voltage monitoring circuit, whether the monitoring voltage is equal to or exceeds a monitoring threshold voltage, receiving, at the voltage monitoring circuit, an output indicating whether an inputted reference voltage and an inputted feedback voltage at a comparator circuit differs, regulating, at the voltage monitoring circuit, a feedback voltage to match the inputted reference voltage based on the output and a determination that the monitoring voltage is equal to or exceeds the monitoring threshold voltage, and providing, from the voltage monitoring circuit, the feedback voltage as an updated inputted feedback voltage for the comparator circuit.

A method for adjusting the clarity of an audio output in a changing environment, including: receiving a content signal; applying a customized gain to the content signal; and outputting the content signal with the customized gain to at least one speaker for transduction to an acoustic signal, wherein the customized gain is applied on a per frequency bin basis such that frequencies of a lesser magnitude are enhanced with respect to frequencies of a greater magnitude and an intelligibility of the acoustic signal is set approximately at a desired level, wherein the customized gain is determined according to at least one of a gain applied to the content signal, a bandwidth of the content signal, and a content type encoded by the content signal.

The detection matrix for an Orthogonal Differential Vector Signaling code is typically embodied as a transistor circuit with multiple active signal inputs. An alternative detection matrix approach uses passive resistor networks to sum at least some of the input terms before active detection.

A PA module includes a previous stage amplification element to amplify a high-frequency signal, a posterior stage amplification element to amplify the high-frequency signal amplified by the previous stage amplification element, and a variable filter circuit arranged between the previous stage amplification element and the posterior stage amplification element and to vary a pass band and an attenuation band in accordance with a frequency band of the high-frequency signal, in which the variable filter circuit includes a filter portion and switches, the previous stage amplification element, the switches, and the posterior stage amplification element are arranged on a mounting surface of a substrate, the filter portion is stacked and arranged so as to overlap with at least one of the previous stage amplification element, the switches, and the posterior stage amplification element when the substrate is viewed in a plan view.

A PA module includes a previous stage amplification element to amplify a high-frequency signal, a posterior stage amplification element to amplify the high-frequency signal amplified by the previous stage amplification element, and a variable filter circuit arranged between the previous stage amplification element and the posterior stage amplification element and to vary a pass band and an attenuation band in accordance with a frequency band of the high-frequency signal, in which the variable filter circuit includes a filter portion and switches, the previous stage amplification element, the switches, and the posterior stage amplification element are arranged on a mounting surface of a substrate, the filter portion is stacked and arranged so as to overlap with at least one of the previous stage amplification element, the switches, and the posterior stage amplification element when the substrate is viewed in a plan view.

According to one embodiment, a low noise amplifier (LNA) circuit includes a first stage which includes: a first transistor; a second transistor coupled to the first transistor; a first inductor coupled in between an input port and a gate of the first transistor; and a second inductor coupled to a source of the first transistor, where the first inductor and the second inductor resonates with a gate capacitance of the first transistor for a dual-resonance. The LNA circuit includes a second stage including a third transistor; a fourth transistor coupled between the third transistor and an output port; and a passive network coupled to a gate of the third transistor. The LNA circuit includes a capacitor coupled in between the first and the second stages, where the capacitor transforms an impedance of the passive network to an optimal load for the first amplifier stage.

An aspect includes a filtering method including operating a first filter to filter a first input signal to generate a first output signal; operating a second filter to filter a second input signal to generate a second output signal; and selectively coupling at least a portion of the second filter with the first filter to filter a third input signal to generate a third output signal. Another aspect includes a filtering method including operating switching devices to configure a filter with a first set of pole(s); filtering a first input signal to generate a first output signal with the filter configured with the first set of pole(s); operating the switching devices to configure the filter with a second set of poles; and filtering a second input signal to generate a second output signal with the filter configured with the second set of poles.

Embodiments of linear equalizers are disclosed. In an embodiment, a linear equalizer includes sets of transistors, a resistor, and first and second impedance elements. The sets of transistors are connected between at least one input terminal of the linear equalizer and at least one output terminal of the linear equalizer. The resistor is connected to a supply voltage, to the at least one output terminal, and to the sets of transistors. The first and second impedance elements are connected between emitter terminals or source terminals of the sets of transistors and at least one fixed voltage. A peaking gain of the linear equalizer is programmable by adjusting a direct current (DC) component of at least one input signal that is received at the at least one input terminal and that is applied to the sets of transistors.