Abstract: Drive device includes first housing, second housing configured to move relatively with respect to first housing, drive section, spindle member, nut member, moving member, coil spring, and spring guide member. First housing includes inner peripheral surface, housing portion housing drive section, and protruding portion protruding toward the center from inner peripheral surface. Spring guide member includes spring support portion and flange portion protruding outward in the radial direction of spring support portion. Flange portion of spring guide member is held between protruding portion and drive section in the axis X direction of spindle member.

Abstract: A design supporting apparatus of a semiconductor integrated circuit includes an input device configured to receive data of a transient current waveform, a first modeling part configured to model the semiconductor integrated circuit as a current source for generating the transient current waveform and to connect the current source and an equivalent circuit of an evaluation board to generate an evaluation circuit model, a first calculation part configured to calculate electromagnetic interference of the evaluation circuit model, a first correction part configured to correct a portion of the equivalent circuit of the evaluation board, a second modeling part configured to add an additional circuit to a corrected evaluation circuit model to generate a countermeasure circuit model, a second calculation part configured to calculate electromagnetic interference of the countermeasure circuit model, and a second correction part configured to correct the additional circuit.

Abstract: A design supporting apparatus of a semiconductor integrated circuit includes an input device configured to receive data of a transient current waveform, a first modeling part configured to model the semiconductor integrated circuit as a current source for generating the transient current waveform and to connect the current source and an equivalent circuit of an evaluation board to generate an evaluation circuit model, a first calculation part configured to calculate electromagnetic interference of the evaluation circuit model, a first correction part configured to correct a portion of the equivalent circuit of the evaluation board, a second modeling part configured to add an additional circuit to a corrected evaluation circuit model to generate a countermeasure circuit model, a second calculation part configured to calculate electromagnetic interference of the countermeasure circuit model, and a second correction part configured to correct the additional circuit.

Abstract: A switching power supply device includes: a positive voltage output circuit connected to a direct-current power supply, the positive voltage output circuit including a first switching element, a voltage boosting inductor, a first rectifying element and a first capacitor; a negative voltage output circuit connected to the power supply, the negative voltage output circuit including a second switching element, a voltage dropping inductor, a second rectifying element and a second capacitor; and an adder circuit configured to add switching currents flowing when the first and the second switching elements are operated. The circuit elements of the positive voltage output circuit are symmetrical with those of the negative voltage output circuit. The first switching current of the positive voltage output circuit and the second switching current of the negative voltage output circuit are generated in mutually opposite directions and are inputted to the adder circuit.

Abstract: A reference power supply is built into a semiconductor integrated circuit, receives an input voltage VDD, and supplies an internal power supply voltage VREG to a second power supply line. The reference power supply comprises (i) a current source which generates a bias current, and (ii) a reference voltage circuit including a Zener diode arranged on a path of the bias current, configured to output a first voltage according to a voltage generated at the Zener diode, which are arranged in series between a first power supply line and a ground line. An emitter-follower or source-follower buffer circuit includes a first transistor having its base/gate receiving the first voltage and its emitter/source connected to the second power supply line. The buffer circuit outputs, as the internal power supply voltage, a voltage generated at the emitter/source of the first transistor.

Abstract: A switching power supply device includes: a positive voltage output circuit connected to a direct-current power supply, the positive voltage output circuit including a first switching element, a voltage boosting inductor, a first rectifying element and a first capacitor; a negative voltage output circuit connected to the power supply, the negative voltage output circuit including a second switching element, a voltage dropping inductor, a second rectifying element and a second capacitor; and an adder circuit configured to add switching currents flowing when the first and the second switching elements are operated. The circuit elements of the positive voltage output circuit are symmetrical with those of the negative voltage output circuit. The first switching current of the positive voltage output circuit and the second switching current of the negative voltage output circuit are generated in mutually opposite directions and are inputted to the adder circuit.

Abstract: In the present invention, in parallel with a resistor which determines an amplification rate being fed back from an output to an input of an output stage OP amp in an audio amplifier circuit, providing a first diodes connected bi-directionally together with a first switch circuit, the output voltage of the output stage OP amp is limited to a voltage, when the first diodes are turned ON. The limit voltage of the first diodes corresponds to a speaker having a low withstand voltage. Accordingly, through ON/OFF of the first switch circuit, a power output from the output stage OP amp can be selected depending on the withstand voltage of a speaker to be connected.

Abstract: The present invention is provided with a first, a second and a third differential amplifier which operate at a source voltage with respect to a reference voltage or a voltage between these; an output stage having a first and a second transistor driven complimentarily; a first resistor connected to an input terminal; a second resistor connected to an output of the first differential amplifier circuit; and a first and a second feed back resistor connected to an output terminal of the output stage circuit.

Abstract: An audio signal output device that suppresses the effect of noise from the digital IC via the power supply and that permits reduced costs is provided. The audio signal output device comprises a regulator capable of a stabilized supply of power regardless of the noise from the digital IC. The first input stage amplifier, to which an audio signal is inputted and the second input stage amplifier, which inverts the output of the first output stage amplifier, employ the output of the regulator as a power supply source, while the first and second output stage amplifiers, which drive the speaker and consume a large amount of electrical power, employ the power supply voltage (Vdd) directly as a power supply source.

Abstract: In the present invention, a BTL circuit formed in an IC is constituted in such a manner that a second output stage amplifier receives an output of a first output stage amplifier and generates an inverted output and a switch circuit is provided between any one of the outputs of the first and second output stage amplifier and a speaker, wherein through effecting a muting by making use of a delay time of BTL operation of the second output stage amplifier or alternatively, by making use of switches of respective push-pull structured transistors in place of the switch circuit, an early muting from the time of power source turning ON can be realized.

Abstract: In the present invention, in parallel with a resistor which determines an amplification rate being fed back from an output to an input of an output stage OP amp in an audio amplifier circuit, providing a first diodes connected bi-directionally together with a first switch circuit, the output voltage of the output stage OP amp is limited to a voltage, when the first diodes are turned ON. The limit voltage of the first diodes corresponds to a speaker having a low withstand voltage. Accordingly, through ON/OFF of the first switch circuit, a power output from the output stage OP amp can be selected depending on the withstand voltage of a speaker to be connected.

Abstract: The present invention is provided with a first, a second and a third differential amplifier which operate at a source voltage with respect to a reference voltage or a voltage between these; an output stage having a first and a second transistor driven complimentarily; a first resistor connected to an input terminal; a second resistor connected to an output of the first differential amplifier circuit; and a first and a second feed back resistor connected to an output terminal of the output stage circuit.

Abstract: This temperature compensation circuit comprising: a bipolar transistor having a base for receiving thereon an input voltage; a series third resistor connected between a supply and said bipolar transistor; a first resistor connector between said base of said bipolar transistor and the output end of said temperature compensation circuit; and a second resistor connected between the node of said bipolar transistor and said third resistor and said output end. The combination of the temperature characteristics of the base emitter junction of the bipolar transistor and the first and the second resistors may cancel out an arbitrary temperature characteristic of a given electronic device.

Abstract: A video cassette recorder has a plurality of filters for separating a reproduced audio signal into a left channel component and a right channel component. The plurality of filters are provided to each of the left and right channels. A phase comparator compares phases of input and output signals of one of the plurality of filters in at least one of the left and right channels, so that an error signal is produced. The error signal is supplied to each of the plurality of filters to control a frequency characteristic of each of the plurality of filters.

Abstract: A first filter the group delay of which in the pass band contains a ripple is connected to a second filter so as to cancel the ripple. The second filter has a pass band at least within the pass band of the first filter. The gain of the second filter is reduced gradually from the frequency of the minimum attenuation into the lower and higher frequency regions and the group delay thereof is reduced gradually from the frequency of the minimum attenuation into the lower and higher frequency regions.

Abstract: A filter equipment comprises a plurality of filters, which are connected in cascade or in parallel. Characteristics of each filter are controlled according to an applied current. Desired characteristics can be realized by a relatively simple circuit configuration. The filter is controlled to adapt to PAL or NTSC standards, for example.