Abstract: A biosensor includes a working electrode 101, a counter electrode 102 opposing the working electrode 101, a working electrode terminal 103 and a working electrode reference terminal 10 connected to the working electrode 101 by wires, and a counter electrode terminal 104 connected to the counter electrode 102 by a wire. By employing a structure with at least three electrodes, it is possible to assay a target substance without being influenced by the line resistance on the working electrode side.

Abstract: There is provided a filter characteristic adjusting apparatus and a filter characteristic adjusting method which can avoid an increase in circuit scale of the filter characteristic adjusting apparatus, and can speedily adjust a characteristic frequency of the filter to a desired frequency. When performing characteristic adjustment for the filter, the test signal generation unit (31) generates a test signal (s14) which is a pulse signal having the same frequency as the characteristic frequency of the filter (10) on the basis of a reference signal (s17), and a phase-shifted test signal (s14?) that is obtained by shifting the phase of the test signal (s14) by a predetermined amount with a phase shift unit (32) in a control signal generation unit (33) is compared with a filter output signal (s16) that is obtained by inputting the test signal (s14) into the filter (10) to obtain a phase difference between the signals, and then the phase difference is subjected to a binary search to generate a control signal (s11).

Abstract: A pseudo-image signal producing section produces a pseudo-image signal imitating an actual image signal. An amplitude detection section detects the amplitude of the pseudo-image signal having passed through a complex filter circuit. A filter control section controls an element value control section in the complex filter circuit so as to decrease the detected amplitude. The element value control section performs an element value adjustment so that absolute element values of a pair of elements corresponding to each other in two filter circuits in the complex filter circuit increase/decrease in opposite directions.

Abstract: A biosensor includes a working electrode 101, a counter electrode 102 opposing the working electrode 101, a working electrode terminal 103 and a working electrode reference terminal 10 connected to the working electrode 101 by wires, and a counter electrode terminal 104 connected to the counter electrode 102 by a wire. By employing a structure with at least three electrodes, it is possible to assay a target substance without being influenced by the line resistance on the working electrode side.

Abstract: The reset function incorporated microcomputer of the present invention, capable of suppressing a variation in reset voltage with a simple configuration, includes a reset decision section. In the reset decision section, a band gap reference circuit generates a predetermined reference voltage VA. A voltage dividing resistance generates a reset voltage VR from the reference voltage VA. A comparator compares the supply voltage VDD applied to the microcomputer with the reset voltage VR, and outputs a reset signal SR.

Abstract: The reset function incorporated microcomputer of the present invention, capable of suppressing a variation in reset voltage with a simple configuration, includes a reset decision section. In the reset decision section, a band gap reference circuit generates a predetermined reference voltage VA. A voltage dividing resistance generates a reset voltage VR from the reference voltage VA. A comparator compares the supply voltage VDD applied to the microcomputer with the reset voltage VR, and outputs a reset signal SR.

Abstract: For the realization of a unipolar analog input range, in addition to the provision of an analog input sampling circuit having an input capacitor, a charge transfer circuit, an integrator having an integrating capacitor, a comparator, and a D-type flip-flop, there is further provided a reference voltage sampling circuit for selectively adding either of a subtraction and addition voltages which are different from each other to a sampled analog input voltage in response to a delayed comparator output. The reference voltage sampling circuit has a subtraction and addition capacitors differing in capacitance value from each other.

Abstract: A &Dgr;&Sgr;-type analog-digital (A-D) converter is used for A-D conversion of a blood sugar level measured by a blood sugar sensor. This enables an accurate measurement result to be obtained with improved resolution. Using the measurement result of an offset voltage in a current-voltage converter enables compensation for the offset voltage. Moreover, using the measurement result of a blood sugar level obtained with a current being applied to a dummy resistor, i.e., an element that simulates electric characteristics of the blood sugar level sensor, enables compensation for variation in the measured value between individual devices resulting from manufacturing variation. As a result, a more precise blood sugar level measuring device having higher measurement accuracy can be implemented.

Abstract: A control unit includes sample-and-hold circuits, their associated switching circuits and a switch controller. Each of the sample-and-hold circuits includes a switch. The switch controller sequentially outputs switch control signals one after another to the sample-and-hold circuits. For example, at a point in time data has been sampled and held in a first one of the sample-and-hold circuits, a first one of the switching circuits outputs a CLOSED signal to a second one of the switching circuits via a signal line. The second switching circuit does not output the switch control signal, received from the switch controller, to a second one of the sample-and-hold circuits until the second switching circuit receives the CLOSED signal from the first switching circuit. Accordingly, while one of the sample-and-hold circuits is sampling and holding the data, none of the other sample-and-hold circuits is allowed to open its switch.

Abstract: For the realization of a unipolar analog input range, in addition to the provision of an analog input sampling circuit having an input capacitor, a charge transfer circuit, an integrator having an integrating capacitor, a comparator, and a D-type flip-flop, there is further provided a reference voltage sampling circuit for selectively adding either of a subtraction and addition voltages which are different from each other to a sampled analog input voltage in response to a delayed comparator output. The reference voltage sampling circuit has a subtraction and addition capacitors differing in capacitance value from each other.