An oscillation circuit design support method is provided for designing an oscillation circuit condition in a circuit board equipped with an integrated circuit (IC) chip for oscillation and an oscillator. The method includes receiving an input of IC chip information about an IC chip for oscillation, providing sample oscillator data and sample oscillation circuit condition data that are determined in accordance with the IC chip information, receiving an input of frequency measurement information measured based on the sample oscillation circuit condition data when an oscillator corresponding to the sample oscillator data is installed at a circuit board, and a providing information relating to matched oscillation circuit condition data determined based on at least the frequency measurement information.

An oscillation circuit design support method is provided for designing an oscillation circuit condition in a circuit board equipped with an integrated circuit (IC) chip for oscillation and an oscillator. The method includes receiving an input of IC chip information about an IC chip for oscillation, providing sample oscillator data and sample oscillation circuit condition data that are determined in accordance with the IC chip information, receiving an input of frequency measurement information measured based on the sample oscillation circuit condition data when an oscillator corresponding to the sample oscillator data is installed at a circuit board, and a providing information relating to matched oscillation circuit condition data determined based on at least the frequency measurement information.

A switch drive circuit is provided with a surge detecting unit that detects a surge voltage produced in response to a change in a switching state of the switch; an adjusting unit that adjusts, based on the surge voltage detected by the surge detecting unit, a switching speed of the switch when changing the switching state of the switch; and a mask processing unit that prevents a voltage, detected by the surge voltage detecting unit in a period other than a period where the surge voltage is assumed to be produced in response to a change in the switching state of the switch, from being used by the adjusting unit for adjusting the switching speed.

A pedestal on which a beveled blank is mounted is provided with a recess portion and an edge portion. The recess portion is provided in a central part of a surface of a pedestal body of the pedestal. The edge portion is adjacent to the recess portion to which the blank is fixed. The recess portion has a length in the short side direction of the pedestal body longer than that of the short side of the blank.

A pedestal on which a beveled blank is mounted is provided with a recess portion and an edge portion. The recess portion is provided in a central part of a surface of a pedestal body of the pedestal. The edge portion is adjacent to the recess portion to which the blank is fixed. The recess portion has a length in the short side direction of the pedestal body longer than that of the short side of the blank.

In some examples, a circuit is configured to control an anti-series switch comprising a first transistor and a second transistor coupled in an anti-series configuration. The circuit comprises one or more driver circuits configured to control gates of the first transistor and the second transistor, and a detection circuit configured to detect whether both the first transistor and the second transistor are in an OFF state. The detection circuit is configured to deliver a signal to the anti-series switch, detect the signal in the anti-series switch, and determine whether the both the first transistor and the second transistor are in an OFF state based on the detected signal.

Provided is a semiconductor device exemplified by an inverter circuit and a shift register circuit, which is characterized by a reduced number of transistors. The semiconductor device includes a first transistor, a second transistor, and a capacitor. One of a source and a drain of the first transistor is electrically connected to a first wiring, and the other thereof is electrically connected to a second wiring. One of a source and a drain of the second transistor is electrically connected to the first wiring, a gate of the second transistor is electrically connected to a gate of the first transistor, and the other of the source and the drain of the second transistor is electrically connected to one electrode of the capacitor, while the other electrode of the capacitor is electrically connected to a third wiring. The first and second transistors have the same conductivity type.

Provided is a semiconductor device exemplified by an inverter circuit and a shift register circuit, which is characterized by a reduced number of transistors. The semiconductor device includes a first transistor, a second transistor, and a capacitor. One of a source and a drain of the first transistor is electrically connected to a first wiring, and the other thereof is electrically connected to a second wiring. One of a source and a drain of the second transistor is electrically connected to the first wiring, a gate of the second transistor is electrically connected to a gate of the first transistor, and the other of the source and the drain of the second transistor is electrically connected to one electrode of the capacitor, while the other electrode of the capacitor is electrically connected to a third wiring. The first and second transistors have the same conductivity type.

A broadband terahertz fourth-harmonic mixer circuit, a mixer and a method wherein the broadband terahertz fourth-harmonic mixer circuit includes a radio frequency signal coupled transmission unit, nonlinear device, local oscillator filter, local oscillator signal coupled transmission unit and intermediate frequency filter unit which are sequentially connected; and further includes a radio frequency input port, local oscillator input port and intermediate frequency output port, where the radio frequency input port is connected to the radio frequency signal coupled transmission unit, the local oscillator input port is connected to the local oscillator signal coupled transmission unit, the intermediate frequency output port is connected to an output end of the intermediate frequency filter unit, and the local oscillator filter is of a two-level cascaded filter structure.

A broadband terahertz fourth-harmonic mixer circuit, a mixer and a method wherein the broadband terahertz fourth-harmonic mixer circuit includes a radio frequency signal coupled transmission unit, nonlinear device, local oscillator filter, local oscillator signal coupled transmission unit and intermediate frequency filter unit which are sequentially connected; and further includes a radio frequency input port, local oscillator input port and intermediate frequency output port, where the radio frequency input port is connected to the radio frequency signal coupled transmission unit, the local oscillator input port is connected to the local oscillator signal coupled transmission unit, the intermediate frequency output port is connected to an output end of the intermediate frequency filter unit, and the local oscillator filter is of a two-level cascaded filter structure.