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21. 发明专利

JPS59228404A AMPLIFIER CIRCUIT 失效
公开(公告)号：JPS59228404A
公开(公告)日：1984-12-21
申请号：JP10257883
申请日：1983-06-10
申请人： HITACHI LTD
发明人： TAKESHITA RITSUJI , SEKI KUNIO , HORIUCHI KENJI
IPC分类号： H03F1/30
摘要： PURPOSE:To allow a midpoint voltage to be set to a half of a power supply voltage corresponding to its fluctuation by supplying respectively a current changed in response to the fluctuation of the power supply voltage and a current independently of the fluctuation of the power supply voltage to an input and an output of a current mirror circuit. CONSTITUTION:A current I1 becomes a constant current by a constant voltage Zener diode ZD, and a resistor R5 and a transistor (TR)Q3, a resistor R6 and a TRQ4, and a resistor R7 and a TRQ5 act respectively like a constant current circuit by using a resistor R3, a diode D1 and a resistor R4. Since a current I0 applied to a collector of an input TRQ11 of a current mirror circuit comprising TRs Q11, Q14 is the sum of currents I11 and I12, the current I0 consists of an element corresponding to the voltage fluctuation of a voltage +VCC and an element not corresponding thereto. Further, a constant current I12 independently of the fluctuation of the voltage +VCC is applied to the collector of the output TRQ14 of the current mirror circuit comprising the TRs Q11, Q14. Thus, the midpoint voltage VQ is changed at a value of nearly VCC/2 in response to the voltage change in the power supply voltage +VCC.

22. 发明专利

JPS59117314A Transistor circuit 失效
标题翻译：晶体管电路
公开(公告)号：JPS59117314A
公开(公告)日：1984-07-06
申请号：JP22615182
申请日：1982-12-24
申请人： Hitachi Ltd
发明人： SEKI KUNIO , HORIUCHI KENJI
IPC分类号： H03K3/2893 , H03K3/295
CPC分类号： H03K3/2893
摘要： PURPOSE:To turn on a transistor (TR) even with an input signal voltage corresponding to a base-emitter voltage or below of the TR of an input stage by providing a feedback circuit to a Schmitt circuit to flow a feedback current to the input. CONSTITUTION:When the input signal voltage VIN reaches almost the same level as the base-emitter voltage VBE of a TRQ1, the TRQ1 is turned on, a TRQ2 is turned off and a current Ic flows to a current mirror circuit 1. When each collector area of a multicollector TRQ3 is the same, the relation of IO=IF=Ic/2 is obtained. Then, even if the voltage VIN is decreased, while the relation of VIN>VBE1-R1.IF is established, the TRQ1 is turned on by flowing the current IF to the resistor R1, and when the voltage VIN is lower than the value, the TRQ1 is turned off. Thus, the hysteresis width is decided by the R1.IF, and the Schmitt circuit operated surely is obtained even with a low input signal voltage.
摘要翻译：目的：即使通过向施密特电路提供反馈电路来使反馈电流流向输入，甚至通过对应于基极 - 发射极电压或低于输入级的TR的输入信号电压来接通晶体管（TR）。构成：当输入信号电压VIN达到与TRQ1的基极 - 发射极电压VBE几乎相同的电平时，TRQ1导通，TRQ2截止，电流Ic流向电流镜电路1.当每个收集器多集电极TRQ3的面积是相同的，获得了IO = IF = Ic / 2的关系。然后，即使电压VIN下降，VIN> VBE1-R1.IF的关系成立，通过将电流IF流向电阻R1，导通TRQ1，当电压VIN低于该值时， TRQ1关闭。因此，滞后宽度由R1.IF决定，即使在低输入信号电压下也可以获得施密特电路。

23. 发明专利

JPS58157205A AUDIO AMPLIFIER 失效
公开(公告)号：JPS58157205A
公开(公告)日：1983-09-19
申请号：JP3954582
申请日：1982-03-15
申请人： HITACHI LTD
发明人： SEKI KUNIO , HORIUCHI KENJI
IPC分类号： H03F1/00
摘要： PURPOSE:To decrease the start time and to prevent pop noise from being generated in advance, by branching an output of a start circuit and applying the branched outputs to a control terminal of a bias circuit and a bias control terminal of an input amplifying circuit. CONSTITUTION:Since a start transistor (TR)Q12 is conductive just after the application of power supply and a TRQ35 is conducted by a current C from the 1st collector P1, a current of the 2nd collector P2 toward the C does not flow to a speaker SP. A current from the P2 toward the B flows to a capacitor C13 and also to each base of TRs Q13, Q15 of a current mirror circuit. As a result, the leading of the current mirror circuit is accelerated and a prescribed bias voltage is given to TRs Q17, Q18 via a TRQ16 in a short time. Thus, the TRQ35 is operated quickly just after the application of power supply and the start time is quickened.

24. 发明专利

JPS58157204A AUDIO AMPLIFIER 失效
公开(公告)号：JPS58157204A
公开(公告)日：1983-09-19
申请号：JP3954482
申请日：1982-03-15
申请人： HITACHI LTD
发明人： SEKI KUNIO , HORIUCHI KENJI
IPC分类号： H03F1/00
摘要： PURPOSE:To prevent the generation of pop noise, by making one of an active element of an output amplifying circuit conductive with an output of a start circuit started at the application of power supply. CONSTITUTION:When the power supply is applied to a terminal 1', a charging current flows to a capacitor C10 via a resistor R15 at the transient state where the power supply voltage is increased to Vcc', and a bias current 1 makes normal gradually at the same time. Thus, a starting transistor (TR)Q12 is conductive just after the application of power supply, a TRQ35 turns on, the charging current of a capacitor C12 flows to the TRQ35 and no pop noise is given to a speaker SP. Further, when the power supply voltage Vcc' becomes the steady- state, a base voltage is applied to the TRQ35 by the output of the bias circuit 1 possible for the amplification of audio signals.

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