A self-oscillating amplifier system is disclosed. The system comprises a pulse modulator, a switching power amplification stage and a demodulation filter. Moreover, the system comprises a compensator including a forward filter which is a high order filter including a second order pole pair and a second order zero pair. Hereby it is possible to decrease the phase turn at low frequencies for better stability and increasing the gain of the control loop within the desired bandwidth.

A filter device configured to directly connect to a differential power amplifier of a transmit chain circuit. The filter device may include a transformer and a filter configured as a half lattice equivalent topology and having a single-ended output. The filter may be a lattice filter configured as a full lattice topology or a lattice equivalent filter configured as a half lattice equivalent topology. The filter includes a first branch having a first impedance network of one or more first impedance elements and a second branch having a second impedance network of one or more second impedance elements. The single-ended output of the filter device may connect to an antenna switch that is in turn connected to an antenna.

A amplifier device includes an amplifier, a coupling circuit, and a filter circuit. The amplifier amplifies a high frequency signal, and outputs to signal output ports the high frequency signal. The coupling circuit is provided side-by-side with the amplifier in a first direction on a substrate, connected to the signal output ports, and configured to couple output signals and output one output signal to an output terminal. The filter circuit is provided on the substrate and connected to the coupling circuit, and configured to reduce third-order IMD included in the one output signal. The one output signal is output from a middle of the substrate in a second direction intersecting with the first direction, and the filter circuit is arranged next to an edge of the substrate in the second direction, and arranged next to an edge of the substrate on the output terminal side in the first direction.

An analog front-end circuit capable of dynamically adjusting gain includes a programmable gain amplifier (PGA) circuit, a sensor, a calculation circuit, a gain coarse control circuit and a gain fine control circuit. The PGA circuit includes an amplifier, a gain coarse adjustment circuit and a gain fine adjustment circuit. The gain coarse adjustment circuit is controlled by a coarse control signal, and a gain is adjusted in a coarse step according to an initial gain. The gain fine adjustment circuit is controlled by a fine control signal in a data mode, and the gain is adjusted in a fine step. The calculation circuit calculates a primary gain adjustment and a secondary gain adjustment. The gain coarse control circuit generates the coarse control signal according to the primary gain adjustment, and the gain fine control circuit generates the fine control signal according to the secondary gain adjustment.

An integrated circuit can include an amplifier coupled to receive an analog input signal, an anti-aliasing filter (AAF) coupled to an output of the amplifier, a buffer circuit coupled to an output of the AAF, a sigma-delta modulator configured to generate a digital data stream in response to an output of the buffer, and a plurality of chopping circuits nested within one another, including a first pair of chopping circuits having at least the amplifier disposed therebetween and configured to remove offset in the analog input signal, and a second pair of chopping circuit having at least the first pair of chopping circuits disposed therebetween. The amplifier, AAF, sigma-delta modulator, and chopping circuits can be formed with the same integrated circuit substrate. Corresponding methods and systems are also disclosed.

The present invention relates to circuitry comprising: interpolation filter circuitry configured to receive a digital input signal and to output an interpolated digital signal; amplifier circuitry configured to generate an output signal based on the interpolated digital signal; and protection circuitry. The protection circuitry is configured to activate in response to detection of a fault condition at an output of the amplifier circuitry. The circuitry further comprises first detection circuitry configured to output a control signal to disable the protection circuitry on detection of a transient signal at an output of the interpolation filter circuitry that is unrelated to a fault.

A radio-frequency module includes a mounting substrate including a ground electrode layer formed by a planar wiring pattern; multiple ground terminals, which are multiple external connection terminals that are arranged on a first main surface of the mounting substrate and that are set to ground potential; and a first radio-frequency component (for example, a reception filter and/or a low noise amplifier) mounted on the first main surface. The multiple ground terminals are arranged at an outer periphery side of the first main surface with respect to the first radio-frequency component and are connected to the ground electrode layer. In a plan view of the mounting substrate, at least part of the first radio-frequency component is overlapped with the ground electrode layer.

Disclosed herein is a voltage gain amplifier for use in an automotive radar receiver chain. The voltage gain amplifier utilizes pole-zero cancelation to yield a desired transfer function without gain peaking at a bandwidth in which attenuation is desired, and utilizes a low pass filter effectively formed by a feedback loop including a high pass filter and a differential amplifier to ensure the desired level of attenuation at the desired bandwidth. In some instances, a chopper may be utilized in the feedback loop prior to the high pass filter, and after the differential amplifier, so as to reduce the bandwidth of the differential amplifier in the feedback loop.

A radio frequency module includes a switch circuit that includes selection terminals, a filter that allows the signal in the first frequency band to pass therethrough, a filter that allows the signal in the second frequency band to pass therethrough, a phase adjustment circuit that is connected to the selection terminal and the filter, and a phase adjustment circuit that is connected to the selection terminal and the filter. The filter includes an acoustic wave resonator that is formed on a substrate that has piezoelectricity. The filter includes an acoustic wave resonator that is formed on a substrate that has piezoelectricity. At least one of circuit elements that are included in the phase adjustment circuit is formed on the substrate. At least one of circuit elements that are included in the phase adjustment circuit is formed on the substrate.

A high-frequency module includes an antenna terminal, a transmission signal terminal, a reception signal terminal, a plurality of earth terminals, a switch, a transmission filter, a reception filter, and a multilayer board. The multilayer board includes a ground electrode arranged between the transmission filter and the reception filter. The plurality of earth terminals include a first earth terminal and a second earth terminal. When the high-frequency module is viewed in a direction perpendicular to a principal surface of the multilayer board, the reception signal terminal is provided between the antenna terminal and the transmission signal terminal, the first earth terminal is provided between the antenna terminal and the reception signal terminal, and the second earth terminal is provided between the reception signal terminal and the transmission signal terminal.