Abstract: A synchronous detection circuit includes: an offset compensation circuit which generates an offset compensation voltage to compensate an offset voltage superposed on a direct current voltage signal; and a temperature compensation circuit which generates a temperature compensation voltage to compensate variation of a direct current reference voltage that depends on a temperature in a signal path of a sensing circuit. In the circuit, the synchronous detection circuit synchronously detects an alternating current signal, the offset compensation voltage and the temperature compensation voltage are respectively superposed on the alternating current signal which is input into the synchronous detection circuit, and the synchronous detection circuit synchronously detects the alternating current signal on which the offset compensation voltage and the temperature compensation voltage have been superposed.

Abstract: A temperature compensation circuit performing temperature compensation of an analog reference voltage, includes: a first reference voltage generating circuit generating a first voltage of which a voltage level varies depending on a temperature; a second reference voltage generating circuit generating a second voltage of which a voltage level is independent of a temperature and having a circuit configuration that is same as a circuit configuration of the first reference voltage generating circuit; an inverting amplifier having a gain of 1, which inverts and amplifies a voltage difference between the first voltage and the second voltage so as to generate a third voltage; and a differential amplifier amplifying a voltage difference between the third voltage and the first voltage so as to generate a fourth voltage In the temperature compensation circuit, the differential amplifier includes: a first operational amplifier; a first resistor coupled between a first node and a second node that is an inverting input te

Abstract: A synchronous detection circuit includes: an offset compensation circuit which generates an offset compensation voltage to compensate an offset voltage superposed on a direct current voltage signal; and a temperature compensation circuit which generates a temperature compensation voltage to compensate variation of a direct current reference voltage that depends on a temperature in a signal path of a sensing circuit. In the circuit, the synchronous detection circuit synchronously detects an alternating current signal, the offset compensation voltage and the temperature compensation voltage are respectively superposed on the alternating current signal which is input into the synchronous detection circuit, and the synchronous detection circuit synchronously detects the alternating current signal on which the offset compensation voltage and the temperature compensation voltage have been superposed.

Abstract: A temperature compensation circuit performing temperature compensation of an analog reference voltage, includes: a first reference voltage generating circuit generating a first voltage of which a voltage level varies depending on a temperature; a second reference voltage generating circuit generating a second voltage of which a voltage level is independent of a temperature and having a circuit configuration that is same as a circuit configuration of the first reference voltage generating circuit; an inverting amplifier having a gain of 1, which inverts and amplifies a voltage difference between the first voltage and the second voltage so as to generate a third voltage; and a differential amplifier amplifying a voltage difference between the third voltage and the first voltage so as to generate a fourth voltage In the temperature compensation circuit, the differential amplifier includes: a first operational amplifier; a first resistor coupled between a first node and a second node that is an inverting input te

Abstract: A novel star block copolymer which can be made to have a high molecular weight and gives a solution having a lower viscosity than solutions of linear polymers having the same molecular weight as the copolymer and which is expected to be used as a resist material; and a process for producing the copolymer. The star block copolymer having alkenylphenol skeletons is obtained by homopolymerizing by living anion polymerization an alkenylphenol compound in which the hydroxyl group of the phenol moiety has been protected by a saturated aliphatic protective group or copolymerizing the alkenylphenol compound with a vinylaromatic compound by living anion polymerization, subsequently copolymerizing the resultant polymer using a polyfunctional coupling agent such as divinylbenzene to obtain a star block copolymer, and eliminating the saturated aliphatic protective groups with an acid reagent.