Ntt Electronics Corporation

Yazaki Corporation

Nihon Dempa Kogyo Co., Ltd.

Yukio Akazawa

Masaki Hirose

Atsushi Nakata

Masatoshi Tobayashi

Shigeru Nakajima

Takehito Ishii

Chiemi Yamagata

Noritoshi Kimura

Tsuneo Mano

Hiroki Hamaguchi

Kengo Noguchi

Yasuhiko Takeo

Hiroshi Inokawa

Masayuki Ino

Nobuaki Ieda

Tetsushi Sakai

An oscillator circuit includes a first resonator, a second resonator, and a frequency adjusting unit. The second resonator has a frequency characteristic different from a frequency characteristic of the first resonator. The frequency adjusting unit is configured to change a ratio between a contribution of the first resonator and a contribution of the second resonator so as to adjust an output frequency.

Oscillator circuit

A signal transmission device drives a light-emitting element and outputs an optical signal depending on a data signal from an electronic device. The device includes an element driving portion which supplies a driving current to the light-emitting element, wherein the driving current is obtained by superimposing a modulation current on a bias current, the modulation current being dependent on the data signal indicating emitting information of the light-emitting element. A temperature compensation portion of the device controls the bias current and the modulation current depending on the temperature so that a temperature-current characteristic of the light-emitting element is reproduced based on the voltage which is dependent on the temperature and the voltage which is independent from the temperature, thereby performing current control depending on the temperature.

Signal transmission device

A phase detector circuit that prevents a significant loss of lock during input of CIDs (Consecutive Identical Digits) and has a high linearity of a phase to voltage conversion characteristic around a phase-locked point in an operation of comparing phases of random NRZ signals in a phase. By using the phase detector circuit having a circuit configuration containing a delay circuit and a combination of leapt a multiplier circuit and a subtractor circuit, a capability as the PLL circuit of preventing the significant loss of lock can be realized. In addition, since a duty cycle of a pulse appearing at an output terminalof a multiplier circuitapproaches 50% as a phase-locked state is approached, a distortion in the phase to voltage conversion characteristic does not appear, and thus high linearity of the phase to voltage conversion characteristic around thus phase-locked point can be realized.

Phase comparator circuit

This invention provides a semiconductor device including a silicon layer, an insulating layer formed on the silicon layer, a first semiconductor device formed on the insulating film to convert light into an electric signal, and a second semiconductor device formed on the insulating film, wherein a silicon region is formed in the silicon layer to shield the second semiconductor device from light, and a through hole extending through the silicon layer except for the silicon region to input light to the first semiconductor device is formed in that portion of the silicon layer corresponding to the lower portions of the first and second semiconductor devices.

Semiconductor device

Growing community of inventors

Kanagawa, Japan

Yukio Akazawa