摘要:
A bias current source generates a constant current Iref by applying to a current-generating resistor a voltage proportional to a thermal voltage Vt. A first bipolar transistor and a second bipolar transistor are disposed in series on the path of the constant current which is generated by the bias current source. A third bipolar transistor forms a current mirror circuit with the second bipolar transistor. A fourth bipolar transistor has a base connected to the base of the first bipolar transistor and has an emitter connected to a temperature-compensating resistor. The constant current circuit outputs a sum of the collector currents of the third bipolar transistor and the fourth bipolar transistor.
摘要:
Trimming by disconnecting a fuse connected in parallel to a feedback resistor of an amplifier circuit would cause a variation in voltage value due to a remaining resistance component. A voltage generator circuit is provided therein with a D/A converter circuit of an R-2R ladder resistor network type circuit. The D/A converter circuit is provided with a first switch circuit to an eighth switch circuit, corresponding to each bit, which are switched to set a digital value. Each switch circuit, which is provided with a fuse for providing a fixed voltage value, allows the fuse to be disconnected to fix the voltage value to a value obtained by inverting the initial value. The setting circuit controls the switching operation of each switch circuit, thereby simulating an electrical state of a fuse being disconnected before the fuse is actually disconnected.
摘要翻译:通过断开与并联的保险丝与放大器电路的反馈电阻的切断将导致由于剩余电阻分量导致的电压值的变化。 电压发生器电路中设置有R-2R梯形电阻网络型电路的D / A转换器电路。 D / A转换器电路具有对应于每个位的第八开关电路的第一开关电路,其被切换以设置数字值。 设置有用于提供固定电压值的熔丝的每个开关电路允许断开熔丝以将电压值固定为通过反转初始值而获得的值。 设置电路控制每个开关电路的开关操作,从而模拟保险丝实际断开之前断开的保险丝的电气状态。
摘要:
The present invention provides a charging device that makes it possible to prevent a current control element supplying current from an AC adapter from being turned OFF and to prevent the light emission of a light-emitting element indicating that charging is in progress from being terminated even when there is a reflux current from the secondary cell. The charging circuit constituting the charging device comprises a current control element that supplies current from the output of the AC adapter to the load and secondary cell; a current detection resistor that detects the charging current from the current control element to the secondary cell; a termination current detection circuit that detects a termination current for the completion of charging from the current flowing to the current detection resistor; a charging-current direction detection circuit that detects the direction of the current flowing to the current detection resistor; a charging current control circuit that controls the current control element, a light-emitting element control circuit that controls the light-emitting element, and a light-emitting element driving element that drives the light-emitting element.
摘要:
Trimming by disconnecting a fuse connected in parallel to a feedback resistor of an amplifier circuit would cause a variation in voltage value due to a remaining resistance component. A voltage generator circuit is provided therein with a D/A converter circuit of an R-2R ladder resistor network type circuit. The D/A converter circuit is provided with a first switch circuit to an eighth switch circuit, corresponding to each bit, which are switched to set a digital value. Each switch circuit, which is provided with a fuse for providing a fixed voltage value, allows the fuse to be disconnected to fix the voltage value to a value obtained by inverting the initial value. The setting circuit controls the switching operation of each switch circuit, thereby simulating an electrical state of a fuse being disconnected before the fuse is actually disconnected.
摘要翻译:通过断开与并联的保险丝与放大器电路的反馈电阻的切断将导致由于剩余电阻分量导致的电压值的变化。 电压发生器电路中设置有R-2R梯形电阻网络型电路的D / A转换器电路。 D / A转换器电路具有对应于每个位的第八开关电路的第一开关电路,其被切换以设置数字值。 设置有用于提供固定电压值的熔丝的每个开关电路允许断开熔丝以将电压值固定为通过反转初始值而获得的值。 设置电路控制每个开关电路的开关操作,从而模拟保险丝实际断开之前断开的保险丝的电气状态。
摘要:
A current-voltage conversion circuit which converts a current to be detected into a voltage, includes a detection resistor, amplifier circuit having a first operational amplifier, and an offset adjusting current source having a third resistor and a fourth resistor which are capable of trimming. The offset adjusting current source causes an offset adjustment current to flow in the offset resistor. The current value of the offset adjustment current is controlled by adjusting the resistance of the third resistor and the fourth resistor. A voltage at a node between the first transistor and the second resistor is output.
摘要:
A current-voltage conversion circuit which converts a current to be detected into a voltage, includes a detection resistor, amplifier circuit having a first operational amplifier, and an offset adjusting current source having a third resistor and a fourth resistor which are capable of trimming. The offset adjusting current source causes an offset adjustment current to flow in the offset resistor. The current value of the offset adjustment current is controlled by adjusting the resistance of the third resistor and the fourth resistor. A voltage at a node between the first transistor and the second resistor is output.
摘要:
An equalizer includes first and second differential amplifiers which have a common output and respective separate current sources, a first negative feed back circuit which feeds back a voltage signal extracted from the common output to the first differential amplifier, a second negative feed back circuit which feeds back the voltage signal to the second differential amplifier, and a filter circuit which is provided at either the first or the second negative feed back circuit and which differentiates frequency characteristics during signal amplification in the first and second differential amplifiers. A frequency characteristic is selected through selection of one of the current values of the respective current sources in response to a sound quality adjusting signal.
摘要:
A pharmaceutical composition for dental use which comprises a strontium compound, a zinc compound, tannin and, optionally, a fluorine compound in such a weight proportion that strontium, zinc, tannin and fluorine is 1 to 3:2 to 4:1 to 3:0 to 4.
摘要:
An equalizer includes first and second differential amplifiers which have a common output and respective separate current sources, a first negative feed back circuit which feeds back a voltage signal extracted from the common output to the first differential amplifier, a second negative feed back circuit which feeds back the voltage signal to the second differential amplifier, and a filter circuit which is provided at either the first or the second negative feed back circuit and which differentiates frequency characteristics during signal amplification in the first and second differential amplifiers. Frequency characterstic is selected through selection of one of the current values of the respective current sources in response to a sound quality adjusting signal.
摘要:
A DC/DC converter is provided with a DC power source; a reference voltage generating circuit; an amplifier which receives an electric power from the DC power source and outputs an electric power of which voltage is controlled so as to assume a target voltage value by stepping down the voltage of the electric power from the DC power source depending on a difference between the reference voltage and a detection voltage; an oscillation circuit which generates signals having a specific frequency; a voltage boosting circuit which receives the output of the amplifier and the output of the oscillation circuit, causes switching of the output of the amplifier at the specific frequency to charge a first capacitor, and performs voltage boosting by transferring the electric charges-charged in the first capacitor through complementary ON/OFF switching with respect to the former switching into a second capacitor after raising substantially upto n/m time voltage (wherein n>m and n and m are integers equal to or more than 2) and charging the same therewith; and an output voltage detection circuit which generates the detection voltage depending on the output voltage of the boosting circuit, whereby a voltage of substantially n/m times of the target voltage value is generated from the voltage boosting circuit.