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31. 发明授权

US5680074A Tube amplifier having specific configuration with four tubes 失效
标题翻译：管放大器具有特定配置，四个管
公开(公告)号：US5680074A
公开(公告)日：1997-10-21
申请号：US436542
申请日：1995-05-08
申请人： Fujio Yamasita
发明人： Fujio Yamasita
IPC分类号： H03F1/33 , H03F3/181 , H03F3/34 , H03F3/52
CPC分类号： H03F3/181 , H03F3/34
摘要： There is provided a tube amplifier comprising a first vacuum tube K3 having a plate applied with a positive voltage and a cathode applied with a negative voltage by a first resistor, a second vacuum tube K4 having a grid connected to the cathode of the first vacuum tube and a cathode or a heater applied with a voltage close to a potential of zero in relation to a plate voltage, and an output transformer TF1 having a first coil and a second coil which is connected to a loud-speaker, said first coil having a terminal connected to the plate of the second vacuum tube and another terminal applied with a positive voltage. Also, timer means is used to optimally maintain the grid voltage of the second vacuum tube when the power source is turned on, and the plate voltage of another vacuum tube K1 provided in a preceding stage of the first vacuum tube is controlled to maintain the negative voltage applied to the grid of the second vacuum tube at a desired value.
摘要翻译：提供了一种管放大器，其包括具有施加正电压的板的第一真空管K3和通过第一电阻施加负电压的阴极，具有连接到第一真空管的阴极的栅极的第二真空管K4 以及施加有相对于板电压接近零电压的阴极或加热器，以及具有连接到扬声器的第一线圈和第二线圈的输出变压器TF1，所述第一线圈具有端子连接到第二真空管的板，另一个端子施加正电压。此外，当电源接通时，定时器装置用于最佳地维持第二真空管的电网电压，并且控制设置在第一真空管的前一级中的另一个真空管K1的板电压以维持负施加到第二真空管的栅极上的电压处于期望值。

32. 发明授权

US4247825A Transistor amplifier 失效
标题翻译：晶体管放大器
公开(公告)号：US4247825A
公开(公告)日：1981-01-27
申请号：US17983
申请日：1979-03-07
申请人： Hermann Berger
发明人： Hermann Berger
IPC分类号： H03F3/343 , H03F1/32 , H03F3/34 , H03F3/347 , H03F3/45
CPC分类号： H03F3/4521 , H03F1/3211 , H03F3/34 , H03F3/45085 , H03F2203/45362 , H03F2203/45366 , H03F2203/45458 , H03F2203/45508 , H03F2203/45596 , H03F2203/45621 , H03F2203/45702 , H03F2203/45712
摘要： A transistor amplifier comprising two transistor pairs, connected in parallel at their bases and collectors and with interconnected emitter electrodes of one transistor pair receiving an essentially constant direct current and the interconnected emitter electrodes of the other transistor pair an essentially constant direct voltage. The amplifier extends the upper range of input voltages at which the difference of the collector currents of these transistor pairs varies as a linear function of the voltage between the bases. As a result, larger input voltages can now be amplified with low distortion.
摘要翻译：晶体管放大器包括两个晶体管对，在它们的基极和集电极处并联连接，并且具有一个晶体管对的互连的发射极接收基本上恒定的直流电流，而另一个晶体管对的互连的发射极电极基本上是恒定的直流电压。放大器扩展了输入电压的上限范围，在该范围内，这些晶体管对的集电极电流的差值作为基极之间的电压的线性函数而变化。因此，现在可以以较低的失真放大较大的输入电压。

33. 发明授权

US4169996A Operational amplifier with slew recovery enhancement 失效
标题翻译：具有SLEW恢复增强功能的操作放大器
公开(公告)号：US4169996A
公开(公告)日：1979-10-02
申请号：US909095
申请日：1978-05-24
申请人： George A. Cavigelli
发明人： George A. Cavigelli
IPC分类号： G01R13/22 , H03F1/48 , H03F3/34 , H03F1/36
CPC分类号： H03F1/486 , G01R13/22 , H03F3/34
摘要： Improved slew recovery in a composite driving amplifier for driving a substantially reactive load including a feedback loop to the operational amplifier from the load for regulating the output of the amplifier, the composite amplifier has a predetermined resistance R1 in the feedback loop and includes a second feedback loop having a predetermined resistance R2. The second feedback loop extends from the output of the operational amplifier to the negative input and is substantially parallel with the first-mentioned feedback loop. To maximize the recovery of the amplifier from a slew condition, the relationship of R1-R2 should be as follows: ##EQU1## wherein: V.sub.o is the output voltage in the amplifier.Slope, is the slope of the load voltage curve during the overload condition, andDelay represents the period of time it takes the overload operational amplifier to respond to a feedback signal at a given overload condition.

34. 发明授权

US3383612A Integrated circuit biasing arrangements 失效
标题翻译：集成电路偏置装置
公开(公告)号：US3383612A
公开(公告)日：1968-05-14
申请号：US51030765
申请日：1965-11-29
申请人： RCA CORP
发明人： HARWOOD LEOPOLD A
IPC分类号： G05F1/56 , H03F1/30 , H03F3/34 , H03F3/347 , H03F3/45 , H03G3/30 , H03K19/018
CPC分类号： H03K19/01806 , G05F1/562 , H03F1/302 , H03F3/34 , H03F3/347 , H03F3/45479 , H03G3/3052

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