Sharp Kabushiki Kaisha Corporation

Shinji Amano

Mutsumi Hamaguchi

Narakazu Shimomura

Mitsuhiro Noboru

Hiroshi Isoda

Yusuke Kishino

Eiji Nakaue

Shohji Sakurai

The present invention provides a touch panel controller for controlling even a large touch panel with little EMI. The touch panel controller of the present invention includes a plurality of driving circuits (DCthrough DCm) for driving respective drive lines (DLthrough DLm) of a capacitive touch panel unitby supplying driving signals (Ds) to the respective drive lines (DLthrough DLm), and a rise/fall time of each of the driving signals (Ds) is variable.

Touch panel controller, touch panel device, and electronic information device

Dispersing directions of oscillation frequency variable ranges of all voltage controlled oscillators provided in an integrated circuit are uniformed, and not only a range covering a frequency regardless of whether a dispersion occurs or not, but also a range covering the frequency only in a case where the dispersion occurs is used as the frequency variable range of the voltage controlled oscillator, and the frequency variable ranges of the voltage controlled oscillators are set so as to be successive with respect to each other, so that a small number of voltage controlled oscillators can cover a wide frequency variable range. Thus, the integrated circuit having voltage controlled oscillators therein is miniaturized.

Integrated circuit and receiving device

An FM signal receiver for use in receiving a burst signals as in a Bluetooth system includes a BPF and a frequency-demodulation circuit, each having, for example, a phase shifter, which is constructed from similar or related circuitry so as to enable adjustment of the frequency characteristics of the BPF and frequency-demodulation circuit through an identical control signal. A short-circuit switch is disposed linking the input and output terminals of an amplifier. A control circuit opens the switch in a receiving operation and closes the switch in an adjusting operation. Thus, adjustment is carried out without using the amplifier. Therefore, an amplifier offset does not affect the frequency-to-voltage conversion by the frequency-demodulation circuit in the adjusting of the frequency-demodulation circuit and similar adjusting of the BPF. Thus, the BPF is prevented from being incorrectly adjusted due to the offset. The BPF characteristics are suitably adjusted.

FM signal receiver and wireless communications device using same

A demodulator includes a reference signal generator for generating a reference signal, an FM demodulation circuit for demodulating a modulated signal, and a control circuit for controlling demodulation sensitivity of the FM demodulation circuit. The control circuit controls the demodulation sensitivity of the FM demodulation circuit so that an output signal, obtained when the reference signal from the reference signal generator is inputted to the FM demodulation circuit, becomes a specified value. This structure can stabilize the demodulation sensitivity of the demodulation circuit while restraining increases in circuit scale and current consumption, and can adjust dispersions in the demodulation sensitivities of the respective ICs due to relative errors of a resistance value of a resistor and a capacity value of a condenser in an IC, the resistor and the condenser constituting the demodulator.

Growing community of inventors

Nara, Japan

Shinji Amano