Abstract: A coupler structure includes a main signal line, a first coupling line, a second coupling line and a spacer element. The main signal line is located on a first plane, the first coupling line is located on a second plane, and the second coupling line is located on a third plane, wherein the second plane and the third plane are both in parallel with the first plane, and the second plane and the third plane are both different from the first plane. The spacer element is connected to the main signal line. The projection of the spacer element on the first plane is located between the projection of the first coupling line on the first plane and the projection of the second coupling line on the first plane. The main signal line, the first coupling line and the second coupling line extend along a virtual line.

Abstract: An amplification circuit includes a signal input terminal, a signal output terminal, a first transistor, a variable impedance element, and a voltage adjustment circuit. The signal input terminal receives a radio frequency signal, and the signal output terminal outputs an amplified radio frequency signal. The first transistor has a first terminal coupled to a reference voltage terminal and a control terminal coupled to the signal input terminal. The variable impedance element is coupled between the first transistor and the signal output terminal and includes a second transistor. A first terminal of the second transistor is coupled to the first transistor, the second terminal of the second transistor is coupled to the signal output terminal, and the control terminal of the second transistor receives a bias signal. The voltage adjustment circuit is coupled to the variable impedance element to adjust the voltage at the second terminal of the second transistor.

Abstract: An amplifier device is provided. The amplifier device includes an inductor, a capacitor, an amplifier, a biasing circuit, and a driving circuit. The inductor and the capacitor are connected in series between a bias point and a first reference voltage terminal. The amplifier is coupled to the bias point to receive a bias signal. The biasing circuit generates a first benchmark voltage according to a bias reference signal and generates the bias signal at the bias point. The driving circuit includes a charging circuit and is coupled to the biasing circuit. The driving circuit controls the charging circuit according to the first benchmark voltage to provide a driving signal for charging the capacitor.

Abstract: An amplifier device, including an inductor, a capacitor, an amplifier, a drive circuit, and a bias circuit, is provided. The inductor and the capacitor are connected in series between a bias point and a first reference voltage terminal. The amplifier is coupled to the bias point to receive a bias signal. The drive circuit receives a start signal and provides a charging signal. The bias circuit is coupled to the bias point and the drive circuit. In a first mode, the start signal has a first level, and the bias circuit provides the bias signal at the bias point according to a bias reference signal and the charging signal. In a second mode, the start signal has a second level, and the bias circuit provides the bias signal at the bias point according to the bias reference signal.

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 signal generation device and a frequency calibration circuit are provided. The signal generation device includes a voltage controlled oscillator (VCO) and the frequency calibration circuit. The VCO provides an oscillation signal according to a first control signal and a second control signal. The frequency calibration circuit compares the first control signal to at least one threshold voltage to generate at least one comparison signal, and generates the second control signal according to the at least one comparison signal. A shift direction of a voltage level of the at least one threshold is the same as a shift direction of a voltage level of a direct current (DC) component of the oscillation signal.

Abstract: A power amplifier and a circuit protection method are provided. The power amplifier includes an input end, an output end, a first amplification circuit, a second amplification circuit, a bias circuit, a current detection circuit, and a first protection circuit. The first amplification circuit includes a first signal input end coupled to the input end and a first signal output end. The first amplification circuit amplifies a radio frequency signal received from the input end. The second amplification circuit amplifies the radio frequency signal received from the first signal output end. The bias circuit outputs a bias current to the second amplification circuit. The current detection circuit generates a digital control signal according to the bias current. The first protection circuit selectively reduces the radio frequency signal input to the first signal input end according to the digital control signal.

Abstract: A switch device and a control method thereof are provided. The switch device includes a receiving circuit. The receiving circuit includes a receiving series circuit. The receiving series circuit includes multiple receiving series transistors coupled in series with each other. The receiving series transistors includes at least one first receiving series transistor and at least one second receiving series transistor. When the switch device executes a first mode, the at least one first receiving series transistor is turned on, and the at least one second receiving series transistor is cut off. When the switch device executes a second mode, the at least one first receiving series transistor is turned on, and the at least one second receiving series transistor is turned on.

Abstract: A radar system is provided. The radar system includes transmitting antennas and receiving antennas. The transmitting antennas includes two transmitting antennas. The two transmitting antennas are configured to transmit transmission signals at different times. The receiving antennas includes two receiving antennas. The two receiving antennas are configured to receive reflected signals at different times. There is a vertical spacing in a certain direction and a horizontal spacing in another direction between the two transmitting antennas. There is another vertical spacing in the certain direction and another horizontal spacing in the another direction between the two receiving antennas. The two directions are perpendicular to each other. The vertical spacing between the two transmitting antennas is equal to the vertical spacing between the two receiving antennas. The horizontal spacing between the two transmitting antennas is equal to the horizontal spacing between the two receiving antennas.

Abstract: A signal processing device and a signal transcciving device are provided. The signal processing device includes a first amplifier, two first choppers, a second chopper, and a third chopper. The first amplifier is configured to generate a second signal according to a first signal. The two first choppers are embedded between an input end and an output end of the first amplifier and respectively configured to perform a shifting operation of a first frequency and a shifting back operation of the first frequency. The second chopper is coupled to the input end of the first amplifier and configured to perform a shifting operation of a second frequency. The third chopper is coupled to the output end of the first amplifier and configured to perform a shifting back operation of the second frequency. The first frequency and the second frequency are different.

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.