摘要:
A turn-off feedback unit (23OFF) of a semiconductor device driving unit generates a feedback voltage as part of a voltage of a drive signal for establishing electrical continuity or disconnection in a bus according to a temporal variation of a collector current of a first semiconductor device (11U) when the first semiconductor device (11U) is turned off from on. A turn-on feedback unit (23ON) generates the feedback voltage according to a commutation current flowing through a free wheeling diode (12D) connected to a second semiconductor device (11D) when the first semiconductor device (11U) is turned on from off.
摘要:
While a dielectric film is set to have a ground potential, a fixed electrode is set to have a different potential from the ground potential. Thereafter, ions produced by corona discharge are allowed to pass through a plurality of acoustic holes formed in the fixed electrode and reach the dielectric film, thereby electretizing the dielectric film.
摘要:
A new electretization technology for a silicon microphone capable of reasonably electretizing a dielectric film of a condenser microphone formed by micromachining a silicon substrate and also capable of taking measures against variations in the microphone sensitivity caused by manufacturing variations and characteristic variations in parts is provided.A silicon microphone chip is completed and is implemented on an printed-circuit board and in this state, electretization processing is executed separately for a dielectric film in one silicon microphone chip by executing corona discharge using one needle electrode 51. More than one electretization is executed and the second or later electretization quantity is determined adaptively based on the actual measurement result of the microphone sensitivity, whereby electretization of the dielectric film is executed precisely and efficiently.
摘要:
While a dielectric film is set to have a ground potential, a fixed electrode is set to have a different potential from the ground potential. Thereafter, ions produced by corona discharge are allowed to pass through a plurality of acoustic holes formed in the fixed electrode and reach the dielectric film, thereby electretizing the dielectric film.
摘要:
Disclosed is a DMA controller incorporated in a data processor, comprising a plurality of channels and a control circuit for overseeing these channels. Each of these channels has registers for storing transfer parameters (address and byte count), registers for storing control parameters (status and command), data assembler circuit, and a channel control circuit that controls these registers and data assembler circuits. The channel control circuit in each channel simultaneously processes transfer parameters for an increased data transmission rate and a reduction of the internal processing unit work load.
摘要:
A turn-off feedback unit (23OFF) of a semiconductor device driving unit generates a feedback voltage as part of a voltage of a drive signal for establishing electrical continuity or disconnection in a bus according to a temporal variation of a collector current of a first semiconductor device (11U) when the first semiconductor device (11U) is turned off from on. A turn-on feedback unit (23ON) generates the feedback voltage according to a commutation current flowing through a free wheeling diode (12D) connected to a second semiconductor device (11D) when the first semiconductor device (11U) is turned on from off.
摘要:
A MEMS device, including: a substrate having a first principal plane and a second principal plane opposite to the first principal plane; a through hole formed in the substrate; and a vibrating film formed over the first principal plane so as to cover the through hole. The first principal plane and the second principal plane are both a (110) crystal face; and the through hole has a substantially rhombic shape on the second principal plane.
摘要:
A turn-off feedback unit (23OFF) of a semiconductor device driving unit generates a feedback voltage as part of a voltage of a drive signal for establishing electrical continuity or disconnection in a bus according to a temporal variation of a collector current of a first semiconductor device (11U) when the first semiconductor device (11U) is turned off from on. A turn-on feedback unit (23ON) generates the feedback voltage according to a commutation current flowing through a free wheeling diode (12D) connected to a second semiconductor device (11D) when the first semiconductor device (11U) is turned on from off.
摘要:
Provided is a microphone device, i.e., an acoustic sensor, with high reliability for reducing noise caused by light. A microphone device includes: a condenser including a first electrode, and a second electrode opposite to the first electrode, the first electrode and the second electrode are provided on a semiconductor substrate; an amplifier which is electrically connected to the condenser. Each of the first electrode and the second electrode has the same conductivity type as the semiconductor substrate.