公开(公告)号：US06525601B2

公开(公告)日：2003-02-25

申请号：US10170067

申请日：2002-06-11

申请人： Barrie Gilbert

发明人： Barrie Gilbert

IPC分类号： G06G712

CPC分类号： G01R19/02 ,  G05F3/222 ,  G05F3/265 ,  H03G1/0088

摘要： An input system for a variable gain amplifier using a continuously interpolated attenuator includes a plurality of gm stages in which the collector current from one transistor in each gm stage is diverted to AC ground, thereby eliminating a feedforward path and providing flat frequency response at very high frequencies. An additional feedforward path through the parasitic emitter capacitances in each gm stage is eliminated by a filter capacitor coupled the common emitter node of each gm stage. A compensation transistor included in each gm stage provides a differential output signal which can be used to cancel common mode feedforward signals which are coupled to the output through the collector-junction capacitances of the gm stages. The effects of parasitic capacitances are further reduced by reverse biasing the gm stages that are off.

公开(公告)号：US06437630B1

公开(公告)日：2002-08-20

申请号：US09473309

申请日：1999-12-28

申请人： Barrie Gilbert

发明人： Barrie Gilbert

IPC分类号： G06G7556

CPC分类号： H03G1/0088 ,  G01R19/02 ,  G05F3/222 ,  G05F3/265

摘要： An RMS-DC converter generates a series of progressively amplified signal pairs which are then multiplied and weighted in such a way as to cancel uncorrelated noise while still providing true square-law response. The converter includes two series of gain stages for generating the amplified signal pairs, and a series of four-quadrant multipliers for multiplying and weighting the amplified signal pairs in response to a series of weighting signals. The outputs from the multipliers are summed and averaged, and a final output signal is generated by integrating the difference between the averaged signal and a reference signal. To preserve the square-law response over a wide range of input voltages, the system is servoed by feeding the final output signal back to an interpolator which generates the weighting signals as a series of continuously interpolated, overlapping, Gaussian-shaped current pulses having a centroid that moves along the length of the interpolator as the final output signal varies. An embodiment can also be implemented with a single series of gain stages that generate a series of amplified signals which are squared, weighted, and averaged.

摘要翻译： RMS-DC转换器产生一系列逐渐放大的信号对，然后将其相乘并加权，以便在仍然提供真正的平方律响应的同时取消不相关的噪声。 该转换器包括用于产生放大信号对的两个增益级系列和一系列四象限乘法器，用于响应一系列加权信号对放大的信号对进行乘法和加权。 来自乘法器的输出被相加和平均，并且通过对平均信号和参考信号之间的差进行积分来产生最终的输出信号。 为了在宽范围的输入电压中保持平方律响应，系统通过将最终输出信号馈送回内插器进行伺服，该内插器产生加权信号作为一系列连续内插，重叠的高斯形电流脉冲，其具有 随着最终输出信号变化，沿着内插器的长度移动的质心。 一个实施例也可以用生成一系列被平方，加权和平均的放大信号的单个增益级来实现。

公开(公告)号：US20010045862A1

公开(公告)日：2001-11-29

申请号：US09556938

申请日：2000-04-21

发明人： Yasuyuki Mizu

IPC分类号： G05F001/10

CPC分类号： G05F1/56 ,  G05F3/222 ,  Y10T307/593

摘要： A current control circuit is provided which is capable of maintaining a constant DC current flowing in a load resistor irrespective of the resistance value of a load resistor connected to a connection terminal. To this end, a constant current circuit (21) is connected to a RING terminal (2), which acts as the connection terminal. The constant current circuit (21) controls a current drive circuit (6) in response to a voltage at the RING terminal (2) to ensure that a DC current flowing in a power feed resistor (4) is kept constant. Due to the fact that DC current flowing in the load resistor irrespective of the resistance value of the load resistor is kept constant, the burden placed on a power supply of a subscriber line interface in a telecommunications network is no longer increased. Also, there no longer arises a need for increasing a power feed resistance and the rating of a power feed transistor, which, in turn, leads to a reduction in manufacturing cost.

摘要翻译： 提供一种电流控制电路，其能够保持在负载电阻器中流动的恒定的直流电流，而与连接到连接端子的负载电阻器的电阻值无关。 为此，恒流电路（21）连接到用作连接端子的RING端子（2）。 恒流电路（21）响应于RING端子（2）处的电压来控制电流驱动电路（6），以确保在馈电电阻器（4）中流动的直流电流保持恒定。 由于负载电阻器中流过的直流电流与负载电阻器的电阻值无关，所以不再增加电信网络中的用户线接口的供电的负担。 此外，不再需要增加馈电电阻和馈电晶体管的额定值，这又导致制造成本的降低。

公开(公告)号：US06201377B1

公开(公告)日：2001-03-13

申请号：US09239605

申请日：1999-01-29

申请人： Don R. Sauer

发明人： Don R. Sauer

IPC分类号： G05F320

CPC分类号： G05F3/222

摘要： A match-insensitive low current bias circuit uses a transistor arrangement which takes advantage of the transistors' collector current degeneration, current gain through emitter sizing, and voltage gain to minimize any errors caused by stage mismatches created during production. The bias circuit of the present invention is particularly suited to integrated circuit applications where a low biasing current is required.

摘要翻译： 不匹配的低电流偏置电路使用晶体管布置，其利用晶体管的集电极电流退化，通过发射极尺寸的电流增益和电压增益来最小化在生产期间产生的阶段错配引起的任何误差。 本发明的偏置电路特别适用于要求低偏置电流的集成电路应用。

公开(公告)号：US6051960A

公开(公告)日：2000-04-18

申请号：US922936

申请日：1997-09-03

申请人： Takashi Ito ,  Misao Furuya

发明人： Takashi Ito ,  Misao Furuya

IPC分类号： H02M3/155 ,  G05F3/22 ,  H02M3/156 ,  H03F3/45 ,  H03K7/08 ,  G05F1/00

CPC分类号： H02M3/156 ,  G05F3/222

摘要： A switching regulator includes an oscillation circuit for generating a triangular waveform signal having a predetermined frequency, a comparator compares the triangular waveform signal generated by the oscillation circuit with a voltage control signal commensurate with a voltage to be output so as to generate a pulse signal which goes high or low depending on a result of the comparison, and a driving circuit for selecting a portion of the triangular waveform signal generated by the oscillation responsive to the pulse signal generated by the comparator, so as to generate the drive signal for driving the switching element.

摘要翻译： 开关调节器包括用于产生具有预定频率的三角形波形信号的振荡电路，比较器将由振荡电路产生的三角形波形信号与与要输出的电压相称的电压控制信号进行比较，以产生脉冲信号， 根据比较结果，变为高或低;以及驱动电路，用于根据由比较器产生的脉冲信号选择由振荡产生的三角波形信号的一部分，以产生用于驱动开关的驱动信号 元件。

公开(公告)号：US5994887A

公开(公告)日：1999-11-30

申请号：US982648

申请日：1997-12-02

申请人： Naoshi Tokuda

发明人： Naoshi Tokuda

IPC分类号： G05F3/30 ,  G05F3/22 ,  G05F3/16

CPC分类号： G05F3/222

摘要： A constant-current generating circuit, a power-source voltage being applied thereto, generates a constant current. A voltage generating circuit element is connected between the constant-current generating circuit and a fixed voltage point, is supplied with the constant current which is generated by the constant-current generating circuit, and generates a constant voltage. A control circuit detects the current generated by the constant-current generating circuit, and, using the detected current, controls the constant-current generating circuit so that the current to be supplied to the voltage generating circuit element is the constant current.

摘要翻译： 恒定电流产生电路施加电源电压产生恒定电流。 在恒流产生电路和固定电压点之间连接有电压产生电路元件，由恒流产生电路产生的恒定电流供给，并产生恒定电压。 控制电路检测由恒流产生电路产生的电流，并使用检测电流来控制恒流产生电路，使得提供给电压发生电路元件的电流为恒定电流。

公开(公告)号：US5963082A

公开(公告)日：1999-10-05

申请号：US930104

申请日：1997-11-10

申请人： Burkhard Dick ,  Andreas Wichern

发明人： Burkhard Dick ,  Andreas Wichern

IPC分类号： G05F3/26 ,  G05F3/22 ,  H04Q7/06 ,  H04Q7/08 ,  H04Q7/12 ,  G05F1/10

CPC分类号： G05F3/222

摘要： A circuit arrangement (16) for producing a D.C. current, includes a feedback loop for producing a reference current from an output terminal (27) with a negative temperature coefficient. The feedback loop includes a current-source stage (17, 18) which feeds a current mirror stage (19, 20, 21) in response to a measuring current supplied from a current bank (24, 25, 28, 29), which also produces the output reference current. The output of the current mirror stage (19, 20, 21) drives a working impedance formed by the main current path of a transistor 22, across which a control voltage is developed which is applied to a control input (23) of the current bank (24, 25, 28, 29). The circuit arrangement is advantageously combined with a reference current source (1) arranged as a bandgap circuit for producing a reference current on an output terminal (2) with a positive temperature coefficient, by enabling the user to select a current reference with either a positive or negative temperature coefficient. Further, the respective reference current outputs with positive and negative temperature coefficients, properly dimensioned, may be combined to provide an output current from a common output terminal (35) which is independent of temperature in a predefined temperature range.

摘要翻译： PCT No.PCT / IB97 / 00238 Sec。 371日期：1997年11月10日 102（e）日期1997年11月10日PCT 1997年3月11日PCT公布。 公开号WO97 / 34211 日期1997年9月18日用于产生直流电流的电路装置（16）包括用于从具有负温度系数的输出端子（27）产生参考电流的反馈回路。 反馈回路包括电流源级（17,18），其响应于从当前组（24,25,28,29）提供的测量电流馈送电流镜级（19,20,21），该电流源级 产生输出参考电流。 电流镜级（19,20,21）的输出驱动由晶体管22的主电流路径形成的工作阻抗，通过该晶体管22的主电流路径产生施加到当前银行的控制输入端（23）的控制电压 （24,25,28,29）。 电路装置有利地与布置成带隙电路的参考电流源（1）组合，用于通过使用户能够以正的温度系数来选择电流参考来产生具有正温度系数的输出端子（2）上的参考电流 或负温度系数。 此外，具有适当尺寸的正和负温度系数的相应参考电流输出可以被组合以提供来自与预定温度范围内的温度无关的公共输出端子（35）的输出电流。

公开(公告)号：US5883504A

公开(公告)日：1999-03-16

申请号：US47345

申请日：1998-03-25

申请人： Hiroyuki Okada

发明人： Hiroyuki Okada

IPC分类号： H02J1/00 ,  G05F1/56 ,  G05F3/22 ,  G05F3/24 ,  H02H9/00 ,  G05F1/569 ,  H02H7/00

CPC分类号： G05F3/222 ,  H02H9/001 ,  G05F3/247

摘要： A power supply unit has a transistor and a resistor circuit connected in series between a power source line and a reference potential point. The node between the transistor and the resistor circuit is connected to an output terminal. A capacitor is connected between the output terminal and the reference potential point. In response to the activation of a starting switch, the transistor is turned on. The power supply unit further has a delay circuit for delaying a rise in the voltage at a predetermined point in the resistor circuit, a current limiting circuit for limiting the current flowing through the transistor, and a current limiting level control circuit for controlling, in accordance with the output of the delay circuit, the level to which the current limiting circuit limits the current. Thus, output of an unduly large current is suppressed when the power supply unit is started up in response to the activation of the starting switch.

摘要翻译： 电源单元具有在电源线和参考电位之间串联连接的晶体管和电阻电路。 晶体管和电阻电路之间的节点连接到输出端。 电容器连接在输出端子和参考电位点之间。 响应于启动开关的激活，晶体管导通。 电源单元还具有用于延迟电阻器电路中预定点处的电压上升的延迟电路，用于限制流过晶体管的电流的限流电路，以及用于根据控制电流限制电平控制电路 随着延迟电路的输出，限流电路限制电流的电平。 因此，当电源单元响应于启动开关的启动而启动时，抑制了过大电流的输出。

公开(公告)号：US5739680A

公开(公告)日：1998-04-14

申请号：US698021

申请日：1996-08-15

申请人： Chang-Sik Lim ,  Young-Gi Ryou

发明人： Chang-Sik Lim ,  Young-Gi Ryou

IPC分类号： G05F3/22 ,  G05F3/16

CPC分类号： G05F3/222

摘要： The present invention relates to a constant voltage control device for preventing parasitic transistors from operating, which comprises a constant voltage generating section, an undervoltage lock-out section, an operation control section, and a supply voltage control section. According to the present invention, parasitic transistors induced during the operation of a switching transistor made of a lateral transistor are prevented from operating by feedback of a signal derived from the Vref signal output from the constant voltage generating section to the operation control section. Unwanted power consumption by the parasitic transistors is reduced and malfunction resulting therefrom is prevented.

摘要翻译： 本发明涉及一种用于防止寄生晶体管工作的恒压控制装置，其包括恒压产生部分，欠压锁定部分，操作控制部分和电源电压控制部分。 根据本发明，由横向晶体管构成的开关晶体管的工作期间感应到的寄生晶体管通过从从恒压产生部输出的Vref信号得到的信号反馈到操作控制部来进行工作。 寄生晶体管的不需要的功率消耗减少，并且防止了由此产生的故障。

公开(公告)号：US5712555A

公开(公告)日：1998-01-27

申请号：US600578

申请日：1996-02-13

申请人： Thomas Jackson ,  Stephen H. Jones

发明人： Thomas Jackson ,  Stephen H. Jones

IPC分类号： G05F3/22 ,  G05F1/40 ,  G05F1/44

CPC分类号： G05F3/222

摘要： The present invention relates to an apparatus and method for voltage regulation. The apparatus includes an error amplifier circuit in communication with an external reference voltage input. The error amplifier circuit produces an error voltage that is proportional to the difference between an external reference input voltage and an output voltage. A series pass circuit is in communication with the error amplifier circuit and is responsive to the error voltage. The method comprises the steps of comparing an external reference voltage to an output voltage, generating an error voltage proportional to the difference between the external reference voltage and the output voltage, and regulating the output voltage based upon the error voltage.

摘要翻译： 本发明涉及一种用于电压调节的装置和方法。 该装置包括与外部参考电压输入通信的误差放大器电路。 误差放大器电路产生与外部参考输入电压和输出电压之间的差成比例的误差电压。 串联电路与误差放大器电路通信并响应误差电压。 该方法包括以下步骤：将外部参考电压与输出电压进行比较，产生与外部参考电压和输出电压之间的差成比例的误差电压，并根据误差电压调节输出电压。