A filter includes an input terminal, an output terminal, a ground terminal, a first capacitor and a second capacitor that are connected in series between the input terminal and the output terminal, a capacitive element that is connected in parallel to the first capacitor and the second capacitor between the input terminal and the output terminal, and has a Q factor that is smaller than a Q factor of the first capacitor and is smaller than a Q factor of the second capacitor, and an inductor that has a first end and a second end, the first end being coupled to a node that is provided between the first capacitor and the second capacitor and that is coupled to the capacitive element through the first capacitor and the second capacitor, the second end being coupled to the ground terminal.

A current transformer (CT) for the purpose of, for example, current measurement, that uses a power line as a first coil and a second coil for measurement purposes, is further equipped with a third coil. Circuitry connected to the third coil is adapted to inject a known reference signal to the third coil of the CT. The injected reference signal, i.e., current, generates signals in the first and second coils of the CT. The signal generated in the second coil is compared using circuitry attached thereto to the reference signal. Based on the results, and the difference between the expected results and the actual results, updated calibration parameters are determined. These provide improved accuracy when using the CT, for example for measurement of the like of current or phase of the primary coil when measurements are adjusted using the newly determined calibration parameters.

A current transformer (CT) for the purpose of, for example, current measurement, that uses a power line as a first coil and a second coil for measurement purposes, is further equipped with a third coil. Circuitry connected to the third coil is adapted to inject a known reference signal to the third coil of the CT. The injected reference signal, i.e., current, generates signals in the first and second coils of the CT. The signal generated in the second coil is compared using circuitry attached thereto to the reference signal. Based on the results, and the difference between the expected results and the actual results, updated calibration parameters are determined. These provide improved accuracy when using the CT, for example for measurement of the like of current or phase of the primary coil when measurements are adjusted using the newly determined calibration parameters.

Disclosed is a radio frequency integrated circuit (RFIC) chip that includes an integrated circuit (IC) area and a crackstop laterally surrounding the IC area. The crackstop includes a metallic barrier (or, alternatively, concentric metallic barriers) electrically isolated from the IC area. One or more noise suppressors and, particularly, one or more passive filters (e.g., low pass filter(s), high pass filter(s), band pass filter(s), and/or band stop filter(s)) are integrated into the structure of the metallic barrier(s) to inhibit propagation, through the crackstop, of noise signals within a specific RF range. The specific RF range can be a customer-specified operating parameter. By embedding customized noise suppressor(s) into the crackstop, local signal interference unique to the customer-specified operating parameters can be minimized while also avoiding or at least minimizing the risk of moisture ingress to the IC area. Also disclosed is a method of forming the chip.

A liquid ejecting apparatus includes a drive circuit that outputs a drive signal, wherein the drive circuit includes a modulation circuit that modulates a base drive signal to output a modulation signal, an amplifier circuit that amplifies the modulation signal to output an amplified modulation signal, a demodulation circuit that demodulates the amplified modulation signal to output the drive signal, and a substrate on which the modulation circuit, the amplifier circuit, and the demodulation circuit are provided, wherein the substrate includes a first face and a second face opposite to the first face, wherein the demodulation circuit includes a first coil and a second coil electrically coupled in parallel with the first coil, and wherein the first coil is positioned so as to overlap at least part of the second coil in a direction normal to the first face.

A radio frequency filtering circuitry includes a first inductor, a second inductor, and a conductive loop. The first inductor receives a first current that induces a second current in the second inductor upon receiving the first current. The first inductor and/or the second inductor induce a third current in the conductive loop. The conductive loop adjusts the third current to reduce a first gain peak of an output signal to correlate to a second gain peak of the output signal.

A radio frequency filtering circuitry includes a first inductor, a second inductor, and a conductive loop. The first inductor receives a first current that induces a second current in the second inductor upon receiving the first current. The first inductor and/or the second inductor induce a third current in the conductive loop. The conductive loop adjusts the third current to reduce a first gain peak of an output signal to correlate to a second gain peak of the output signal.

The present disclosure relates to devices and methods for programming one-time programmable fuses of microphone assemblies. One microphone assembly includes a housing, a transducer, a filter circuit, and an integrated circuit. The integrated circuit has a fuse block having a one-time programmable (OTP) fuse configurable in a programming mode of operation during which a voltage applied to the supply voltage contact is increased relative to a voltage applied to a supply voltage contact in a normal mode of operation. The microphone assembly further includes a protection circuit configured to regulate a voltage at the voltage input terminal of the integrated circuit during the programming mode of operation based on a comparison of a voltage at the voltage input terminal with a reference voltage. The voltage on the voltage input terminal of the integrated circuit tracks the reference voltage during the programming mode of operation.

The present disclosure relates to devices and methods for programming one-time programmable fuses of microphone assemblies. One microphone assembly includes a housing, a transducer, a filter circuit, and an integrated circuit. The integrated circuit has a fuse block having a one-time programmable (OTP) fuse configurable in a programming mode of operation during which a voltage applied to the supply voltage contact is increased relative to a voltage applied to a supply voltage contact in a normal mode of operation. The microphone assembly further includes a protection circuit configured to regulate a voltage at the voltage input terminal of the integrated circuit during the programming mode of operation based on a comparison of a voltage at the voltage input terminal with a reference voltage. The voltage on the voltage input terminal of the integrated circuit tracks the reference voltage during the programming mode of operation.

A method for simple measurement of phase shift between a first clock signal and a second clock signal is described, each clock signal having a period T.sub.0. The method includes: feeding the first clock signal into a first input of a mixer; feeding the second clock signal into a second input of the mixer; feeding the output signal of the mixer into a low pass filter; and measuring the output signal of the low pass filter, with the aid of an output voltage that is normalized to operating voltage of the mixer. A circuit for implementing the method includes a mixer and a low pass filter. The mixer includes a first input for feeding in the first clock signal, and a second input for feeding in the second clock signal. The output of the mixer is connected to the input of the low pass filter.