Abstract: An operational amplifier includes a single-stage amplifier and a current controller. The single-stage amplifier receives an input signal, and amplifies the input signal to generate an output signal, wherein the single-stage amplifier includes a voltage controlled current source circuit that operates in response to a bias voltage input. The current controller receives the input signal, and generates the bias voltage input according to the input signal.

Abstract: An inspection equipment is used for inspecting an antenna, and includes a testing device having a first circuit structure, a carrier, a supporting part and a second circuit structure detachably stacked on one another sequentially. Therefore, the carrier, the first circuit structure, the second circuit structure or the supporting part can be detached when different devices under test are inspected, without replacing the whole testing device, thereby achieving effects of modular replacing and cost saving.

Abstract: An electronic package includes an antenna structure and an adjustment structure arranged on a carrier structure. The antenna structure includes an antenna body and a feed line that are disposed on different layers and a conductive pillar that interconnects the layers to electrically connect the antenna body and the feed line. The adjustment structure extends from the feed line to improve the bandwidth of the antenna body.

Abstract: An electronic package is provided. A functioning member having a concave portion and a second antenna portion is disposed on a carrier having a first antenna portion. The concave portion and the carrier form a functioning space. The first antenna portion and the second antenna portion are disposed in a projection space of the functioning space. The first antenna portion induces the second antenna portion.

Abstract: An oscillation device includes an oscillator and a logic circuit. The oscillator generates an output oscillation signal. The logic circuit controls the oscillator according to the output oscillation signal, such that the output oscillation signal includes two different oscillation periods. The oscillation device may be used as a temperature-to-frequency converter without any bandgap reference circuit.

Abstract: An electronic package is provided with a first substrate having a first antenna portion that is stacked on a second substrate having a second antenna portion via an antenna component. During a packaging process, a gap between the first substrate and the second substrate is held constantly by the antenna component. At the same time, the antenna component is regarded as a third antenna portion of the electronic package. The performance of the antennae is not adversely affected by the antenna component despite the fact that the antenna component is in close proximity to the first and second antenna portions.

Abstract: A testing system includes: a bilinear polarized antenna for receiving and dividing a circularly polarized radio wave associating with a horizontal and a vertical polarization path of an object-to-be-tested into a first and a second high frequency signal; a phase retarder for delaying a phase of the first high frequency signal by 90 degrees to form a first high frequency signal with a phase delay of 90 degrees; a power splitter for receiving or synthesizing the first high frequency signal with the phase delay of 90 degrees and the second high frequency signal; and a high frequency signal transceiver for measuring power of the first high frequency signal with the phase delay of 90 degrees and the second high frequency signal and determining states of the horizontal and vertical polarization paths of the object-to-be-tested based on the power. Therefore, the testing system can speed up testing of the object-to-be-tested.

Abstract: A multi-stage amplifier with a high signal-to-noise ratio is introduced. Multiple amplification stages are cascaded between an input terminal and an output terminal of the amplifier. A controller switches the output stage among the multiple amplification stages from a normal mode to an attenuation mode in response to the amplifier input being lower than the threshold. In the attenuation mode, the output stage provides an attenuation resistor coupled in series with the load resistor of the amplifier. Noise is successfully attenuated by the attenuation-mode output stage.

Abstract: The present invention provides a device including a sound detector and a noise cancellation component. In the operations of the device, the sound detector is configured to receive an environment sound obtained from a microphone, and determine if the environment sound has a meaningful signal or not to generate a detection result; and the noise cancellation component is configured to perform a noise cancellation operation based on the detection result to generate an output signal to a speaker.

Abstract: A testing fixture used in an antenna testing process is provided. A cover unit having a second antenna portion is arranged on a base unit configured for an electronic structure having a first antenna portion to be placed thereon. The cover unit includes a non-metal interposing portion configured for pressing the electronic structure to separate the second antenna portion from the first antenna portion. Therefore, when the antenna testing process is performed on the electronic structure, a metal shielding effect is avoided, and an over the air testing environment is provided.

Abstract: A testing system includes: a bilinear polarized antenna for receiving and dividing a circularly polarized radio wave associating with a horizontal and a vertical polarization path of an object-to-be-tested into a first and a second high frequency signal; a phase retarder for delaying a phase of the first high frequency signal by 90 degrees to form a first high frequency signal with a phase delay of 90 degrees; a power splitter for receiving or synthesizing the first high frequency signal with the phase delay of 90 degrees and the second high frequency signal; and a high frequency signal transceiver for measuring power of the first high frequency signal with the phase delay of 90 degrees and the second high frequency signal and determining states of the horizontal and vertical polarization paths of the object-to-be-tested based on the power. Therefore, the testing system can speed up testing of the object-to-be-tested.

Abstract: A digital-to-analog conversion circuit is used for converting a first digital input into a first analog output, and includes a segmentation circuit, a plurality of multi-bit dynamic element matching digital-to-analog converters (DEM DACs), and a combination circuit. The segmentation circuit applies segmentation to the first digital input to generate a plurality of code segments. The multi-bit DEM DACs convert the code segments into a plurality of DAC outputs, respectively, wherein the multi-bit DEM DACs include at least a first multi-bit DEM DAC and a second multi-bit DEM DAC, and the first multi-bit DEM DAC and the second multi-bit DEM DAC employ different DEM techniques. The combination circuit combines the DAC outputs to generate the first analog output.

Abstract: A wire fixing device adapted for gripping at least one wire in a machine includes a positioning seat having at least one first cavity, and a first gripping seat disposed at one side of the positioning seat. The first gripping seat includes a first body and at least one first gripping member. The first gripping member has a first connection end portion connected to the first body, a first terminal end portion being resilient and opposite to the first connection end portion and inserted into the first cavity, and a first through hole adapted for extension of the wire therethrough. The first terminal end portion is constricted by the first cavity to grip securely the wire.

Abstract: A testing system includes: a bilinear polarized antenna for receiving and dividing a circularly polarized radio wave associating with a horizontal and a vertical polarization path of an object-to-be-tested into a first and a second high frequency signal; a phase retarder for delaying a phase of the first high frequency signal by 90 degrees to form a first high frequency signal with a phase delay of 90 degrees; a power splitter for receiving or synthesizing the first high frequency signal with the phase delay of 90 degrees and the second high frequency signal; and a high frequency signal transceiver for measuring power of the first high frequency signal with the phase delay of 90 degrees and the second high frequency signal and determining states of the horizontal and vertical polarization paths of the object-to-be-tested based on the power. Therefore, the testing system can speed up testing of the object-to-be-tested.

Abstract: A testing fixture used in an antenna testing process is provided. A cover unit having a second antenna portion is arranged on a base unit configured for an electronic structure having a first antenna portion to be placed thereon. The cover unit includes a non-metal interposing portion configured for pressing the electronic structure to separate the second antenna portion from the first antenna portion. Therefore, when the antenna testing process is performed on the electronic structure, a metal shielding effect is avoided, and an over the air testing environment is provided.

Abstract: An electronic package is provided with a first substrate having a first antenna portion that is stacked on a second substrate having a second antenna portion via an antenna component. During a packaging process, a gap between the first substrate and the second substrate is held constantly by the antenna component. At the same time, the antenna component is regarded as a third antenna portion of the electronic package. The performance of the antennae is not adversely affected by the antenna component despite the fact that the antenna component is in close proximity to the first and second antenna portions.

Abstract: A wire fixing device adapted for gripping at least one wire in a machine includes a positioning seat having at least one first cavity, and a first gripping seat disposed at one side of the positioning seat. The first gripping seat includes a first body and at least one first gripping member. The first gripping member has a first connection end portion connected to the first body, a first terminal end portion being resilient and opposite to the first connection end portion and inserted into the first cavity, and a first through hole adapted for extension of the wire therethrough. The first terminal end portion is constricted by the first cavity to grip securely the wire.

Abstract: A digital-to-analog conversion circuit is used for converting a first digital input into a first analog output, and includes a segmentation circuit, a plurality of multi-bit dynamic element matching digital-to-analog converters (DEM DACs), and a combination circuit. The segmentation circuit applies segmentation to the first digital input to generate a plurality of code segments. The multi-bit DEM DACs convert the code segments into a plurality of DAC outputs, respectively, wherein the multi-bit DEM DACs include at least a first multi-bit DEM DAC and a second multi-bit DEM DAC, and the first multi-bit DEM DAC and the second multi-bit DEM DAC employ different DEM techniques. The combination circuit combines the DAC outputs to generate the first analog output.

Abstract: An impedance circuit includes a first poly-resistor and a second poly-resistor. The first poly-resistor has a first terminal coupled to a first node, and a second terminal coupled to a second node. The second poly-resistor has a first terminal coupled to the first node, and a second terminal coupled to the second node. The resistance between the first terminal and the second terminal of the first poly-resistor is determined according to a first control voltage. The resistance between the first terminal and the second terminal of the second poly-resistor is determined according to a second control voltage. The first control voltage and the second control voltage are determined according to a first voltage at the first node and a second voltage at the second node.

Abstract: An impedance circuit includes a poly-resistor and a controller. The poly-resistor has a first terminal and a second terminal. The controller generates a first control voltage and a second control voltage. The resistance between the first terminal and the second terminal of the poly-resistor is determined according to the first control voltage and the second control voltage. The second control voltage is different from the first control voltage. The proposed impedance circuit can improve the linearity of the poly-resistor.