Fujitsu Corporation

Cypress Semiconductor Corporation

Fujitsu Semiconductor Limited

Spansion LLC.

Masaya Mizutani

Takahiro Watai

Koju Aoki

Koji Takekawa

Hiroyuki Sakima

Katashi Hasegawa

Takuya Okajima

Katsuya Shimizu

A voltage adjustment circuit for adjusting a voltage to be supplied to scanning lines of a display device includes a slope adjustment circuit configured to adjust a slope of a decrease in the voltage based on data that is externally input, and a clamp voltage adjustment circuit configured to adjust a voltage value at which the voltage is clamped based on the data.

Voltage adjustment circuit and display device driving circuit

A method and circuit for preventing an output signal, which has been corrected through digital correction or analog correction, from deviating from a target value and for preventing power supply noise and power consumption from increasing. A sensor amplification circuit receives output of a sensor as an input signal. Correction points are set at predetermined temperature intervals. The sensor amplification circuit performs digital correction for correcting the input signal with correction data set for each correction point. Further, the sensor amplification circuit performs a second correction for correcting the input signal between the correction points with gradient data calculated from the correction data for two of the correction points that are adjacent to each other.

Method and circuit for correcting sensor temperature dependency characteristic

An amplifier circuit which is connected to a sensor and variably sets an amplification property and a control method thereof are disclosed, the circuit having the capability of restricting the influence of change with time and temperature change. The amplifier circuit, which receives, as an input, a detection signal from the sensor and variably sets an amplification property, comprises: (1) a first reference value retaining unitfor retaining a first reference value Kfor setting an amplification property which makes an output signal be a specified detection reference output voltage when a reference input condition KJ is detected; (2) a correction signal generation unitfor generating a correction signal HS which reduces the difference between an amplification property actual measurement value and an amplification property set value; and (3) a first amplification property correction unitfor correcting the first reference value Kbased on the correction signal HS.

Amplifier circuit and control method thereof

This invention provides a comparator circuit which outputs a stable waveform without oscillation even if a gradient of a change of a comparison input signal is small and determines a magnitude of the comparison input signal within a predetermined threshold value regardless of the increase/decrease direction of the comparison input signal. A comparator circuitcomprises a capacitative elementwhich is charged or discharged corresponding to a difference of potential between a comparison input signal IN and a reference input signal REF, an analog buffer portionwhich outputs high level if the voltage is above a threshold voltage Vth and low level if it is less than the threshold voltage Vth, an edge detecting portionwhich detects leading and trailing edges of the analog buffer portionso as to output an up signal UP and a down signal DOWN and a charge pump portionwhich charges a capacitative portion corresponding to the up signal UP and discharges the capacitative portion corresponding to the down signal DOWN.

Comparator circuit and control method thereof

Provided are two monitor circuits for monitoring two input signals of an input stage differential amplifier, respectively, and two monitor circuit for monitoring two output signals of the input stage differential amplifier, respectively. When failure occurs at the bridge circuit of a sensor element or at the input stage differential amplifier, the monitoring units or the monitoring units detect abnormality, which makes it possible to detect the failure of the sensor element or the input stage differential amplifier. Therefore it is possible to detect failure such as a disconnection or a short circuit of the bridge circuit of the sensor element and failure which has occurred at the amplifier for amplifying outputs of the sensor element.

Growing community of inventors

Kasugai, Japan

Masaya Mizutani