Abstract: A bias compensation circuit that receives a detection signal from a detection circuit is provided. The detection circuit is configured to detect a radio frequency signal in an amplifier circuit. The bias compensation circuit includes a conversion circuit and a bias circuit. The conversion circuit is coupled to the detection circuit, and is used to adjust a phase or an amplitude of the detection signal to generate an injection signal, wherein the injection signal is a current signal. The bias circuit is coupled to the conversion circuit, and is used to generate a bias signal to the amplifier circuit based on the injection signal, wherein the bias signal varies with the detection signal.

Abstract: A bias compensation circuit includes a power detection circuit and a bias circuit. The power detection circuit includes first and second power distribution circuits, first and second detection circuits, first and second conversion circuits, and a summing circuit. The first and second power distribution circuits respectively generate first and second input signals according to an input signal. The first and second detection circuits generate first and second power signals according to first and second input signals, respectively. The first and second conversion circuits generate first and second power currents according to first and second power signals, respectively. The summing circuit receives the first and second power signals to generate a power signal. The bias circuit receives the power signal to adjust a bias signal and provide the bias signal to the amplifier circuit. An amount of variation of the bias signal per power unit is adjustable.

Abstract: In an amplification device, a signal input terminal receives an input signal. A signal output terminal outputs an amplified signal. An amplification circuit is coupled between the signal input terminal and the signal output terminal, and includes a first transistor and a second transistor coupled in a cascode manner. A third transistor receives a first reference current. A fourth transistor receives a second reference current. A fifth transistor receives a third reference current and is coupled to the fourth transistor. An operational amplifier is coupled to the third transistor and the amplification circuit. A distance from the fourth transistor to a transistor in the amplification circuit is less than a distance from the fifth transistor to the same transistor. The fourth transistor is used to detect temperature changes for compensation.

Abstract: Disclosed is a temperature sensing structure configured to sense a temperature of an object to be tested. The temperature sensing structure includes a temperature sensing element and a thermal conductive component. The thermal conductive component is coupled between the temperature sensing element and the object to be tested for thermal conduction. The thermal conductive component includes a first metal body, a second metal body, and a metal-insulator-metal structure. The first metal body is coupled to the temperature sensing element, the second metal body is coupled to the object to be tested, and the metal-insulator-metal structure is connected between the first metal body and the second metal body.

Abstract: An electrostatic discharge (ESD) protection circuit is coupled between first and second voltage terminals, and further includes first and second bipolar junction transistors (BJTs). First terminals of the first and second BJTs are coupled to the first voltage terminal and the second voltage terminal respectively. Second terminals of the first and second BJTs are coupled to each other. Control terminals of the first and second BJTs are coupled to each other. A breakdown voltage of a junction between the first terminal and the control terminal of the first BJT is greater than a breakdown voltage of a junction between the second terminal and the control terminal of the first BJT. A breakdown voltage of a junction between the first terminal and the control terminal of the first BJT is greater than a breakdown voltage of a junction between the second terminal and the control terminal of the first BJT.

Abstract: An acoustic wave device and a manufacture method thereof are provided. The acoustic wave device comprises a first substrate, a plurality of first electrodes, a second substrate, a plurality of second electrodes and a film. The first substrate comprises a first surface and a second surface. The plurality of first electrodes are disposed on the second surface of the first substrate. The second substrate comprises a third surface and a fourth surface. The plurality of second electrodes are disposed on the third surface of the second substrate. The second surface of the first substrate faces the third surface of the second substrate, such that the plurality of first electrodes and the plurality of second electrodes are arranged between the first substrate and the second substrate. The film is disposed between the plurality of first electrodes and the plurality of second electrodes.

Abstract: An oscillation circuit includes an oscillator and a buffer coupled to the oscillator. The oscillator is used to provide at least one oscillation signal according to an analog control signal. The buffer includes at least one input terminal, at least one output terminal, a buffer unit, a first capacitor array and a second capacitor array. The at least one input terminal is used to receive the at least one oscillation signal. The at least one output terminal is used to provide at least one buffered signal. The buffer unit is coupled between the at least one input terminal and the at least one output terminal. The first capacitor array is used to change a first equivalent capacitance value according to at least one first digital signal. The second capacitor array is used to change a second equivalent capacitance value according to at least one second digital signal.

Abstract: A radio-frequency circuit can include a power amplifier, a first bias circuit and a second bias circuit. The power amplifier can include an input terminal used to receive a radio-frequency signal, and an output terminal used to output an amplified radio-frequency signal. The first bias circuit can include a first output terminal coupled to the input terminal of the power amplifier through a common node. The second bias circuit can include a second output terminal and a current adjustment circuit, where the second output terminal can be coupled to the common node, and the current adjustment circuit can include a transistor. The transistor can include a first terminal coupled to the second output terminal, a second terminal used to receive a reference voltage, and a control terminal.

Abstract: A mixed radio frequency filter includes a first transceiving terminal, a second transceiving terminal, a first series capacitor, a second series capacitor, a first series resonator, and a second series resonator. The first series capacitor, the first series resonator, the second series resonator, and the second series capacitor are coupled in series and in the order listed between the first transceiving terminal and the second transceiving terminal.

Abstract: An amplifier includes a signal input terminal, a signal output terminal, an amplification circuit, and at least one variable voltage generation circuit. The signal input terminal may receive an input signal. The signal output terminal may output an amplified signal. An transistor of the amplification circuit includes a first terminal, a second terminal, a control terminal, and a body terminal, where the control terminal is coupled to the signal input terminal, the second terminal is coupled to the signal output terminal, and the body terminal is floating. The at least one variable voltage generation circuit is coupled to the transistor of the amplification circuit. During a transition period, a first voltage difference presents between the second terminal and the first terminal of the transistor, and during a steady period, a second voltage difference presents therebetween. The first voltage difference is greater than the second voltage difference.

Abstract: A radio frequency filter includes a first transceiving terminal, a second transceiving terminal, a first series resonator, at least one first parallel resonator, at least one second parallel resonator, a first capacitor, a second capacitor, a first inductor, a second inductor and a third inductor. The at least one first parallel resonator is coupled in parallel with the first capacitor and couples the first series resonator to a first node. The at least one second parallel resonator is coupled in parallel with the second capacitor and couples the first series resonator to a second node. The first inductor is coupled to the first transceiving terminal. The second inductor is coupled to the second transceiving terminal. The third inductor is coupled between the first inductor and a reference node and between the second inductor and the reference node.

Abstract: An amplifying circuit includes a first transistor, a second transistor, and a switching circuit. A control terminal of the first transistor is coupled to an input terminal of the amplifying circuit, and a first terminal of the first transistor is coupled to a first reference end. The input terminal of the amplifying circuit receives a first radio frequency (RF) signal. A first terminal of the second transistor is coupled to a second terminal of the first transistor, and a second terminal of the second transistor is coupled to an output terminal of the amplifying circuit. The output terminal of the amplifying circuit outputs an amplified signal. The first transistor amplifies the first RF signal to generate a second RF signal. The switching circuit performs a switching operation to transmit the second RF signal to one of the first terminal and the control terminal of the second transistor.

Abstract: A wireless signal apparatus and a wireless signal detection are provided. The wireless signal apparatus comprises an antenna apparatus. The antenna apparatus comprises a transmitting antenna array and a receiving antenna array arranged in a first plane. The antenna apparatus forms a narrow-beamwidth antenna radiation pattern, the narrow-beamwidth antenna radiation pattern forms a flattened detection area, and the flattened detection area forms a second plane substantially perpendicular to the first plane. The wireless signal apparatus is configured to detect spatial information of an external object within the flattened detection area, and the spatial information comprises only two-dimensional spatial information in the second plane.

Abstract: A method of fabricating an acoustic wave device includes providing a first substrate, the first substrate comprising a first bulkplate and a first frame, and further comprising a first electrode, a piezoelectric layer, and a second electrode stacked in sequence. The first frame is disposed on the first bulkplate and at least partially surrounds the first electrode. The first substrate is thinned such that the first electrode is exposed from a first surface of the first substrate. A second substrate comprises a second bulkplate and a recess, and the recess is recessed from a second surface of the second substrate. The first surface of the first substrate and the second surface of the second substrate are bonded together, and the recess, the first electrode, the piezoelectric layer, and the second electrode at least partially overlap when viewed along a vertical direction to form an overlapping area.

Abstract: An impedance adjustment circuit and an amplifier circuit are provided. The impedance adjustment circuit includes an input terminal, an output terminal, and an impedance adjustment sub-circuit. The impedance adjustment sub-circuit includes a metal-oxide-semiconductor capacitor (MOSCAP) and a switch circuit. A first terminal of the MOSCAP is coupled to the input terminal. A control terminal of the MOSCAP receives a control signal. A control terminal of the switch circuit receives a switch control signal. A base terminal of the MOSCAP is coupled to the output terminal. A capacitance value of the impedance adjustment sub-circuit is changed by changing the switch control signal.

Abstract: An acoustic wave device includes a piezoelectric substrate, a plurality of transducers, and a film. The piezoelectric substrate includes a recess, and the plurality of transducers are positioned in the recess. At least one of the plurality of transducers includes a first bus bar disposed in parallel to a first direction, a plurality of first electrodes extended in parallel to a second direction from the first bus bar, a second bus bar disposed in parallel to the first direction, and a plurality of second electrodes extended in parallel to the second direction from the second bus bar. The film covers the recess of the piezoelectric substrate.

Abstract: An amplification circuit includes an input terminal, an output terminal, a first path circuit and a second path circuit. The input terminal would receive an input signal. The output terminal would output an output signal corresponding to the input signal. The first path circuit includes a co-design circuit, an amplifier circuit, a second matching element, and an electrical overstress circuit. The co-design circuit includes a first matching element. A first terminal of the co-design circuit is coupled to the input terminal. The electrical overstress circuit and the second matching element are coupled to a second terminal of the co-design circuit. The amplifier circuit is coupled between the second terminal of the co-design circuit and the output terminal. The second path circuit is coupled between the input terminal and the output terminal. The co-design circuit provides a first impedance in a first mode and a second impedance in a second mode.

Abstract: An oscillation signal generating circuit and an oscillation signal generating method are provided. The oscillation signal generating circuit includes a first circuit and a second circuit. The first circuit is configured to generate an output signal according to a reference clock signal and a feedback clock signal. The first circuit includes a voltage-controlled oscillator (VCO). The VCO is configured to output the output signal, and a frequency of the output signal is controlled by a control voltage. The second circuit includes a voltage compensation circuit and a maximum phase difference detector. When a maximum phase difference is detected by the maximum phase difference detector, the maximum phase difference detector controls the voltage compensation circuit to compensate the control voltage to a target voltage.

Abstract: The disclosure provides a microwave sensor including a local frequency circuit, an echo path circuit and a processing circuit. In a power saving mode, the processing circuit disables the local frequency circuit, wherein the echo path circuit transmits a first radar signal to an antenna and receives a first echo signal from the antenna. In response to the processing circuit determining that an object has been detected, the microwave sensor enters a normal mode from the power saving mode. In the normal mode, the processing circuit enables the local frequency circuit, wherein the local frequency circuit transmits a second radar signal to the antenna and output a local frequency signal to the echo path circuit. The echo path circuit receives a second echo signal from the antenna. In response to the processing circuit determining that no object has been detected, the microwave sensor enters the power saving mode from the normal mode.

Abstract: A transceiver includes an antenna configured to transmit a first wireless signal based on a transmission signal and receive a second wireless signal, the second wireless signal including a reflected first wireless signal from an object and the antenna transmitting the first wireless signal and receiving the second wireless signal at the same time. A transmission circuit is configured to generate the transmission signal and output the transmission signal to a first side of the antenna. A reception circuit is configured to receive a reception signal from a second side of the antenna, the antenna outputting the reception signal based on the second wireless signal. The first side is different from the second side.