公开(公告)号：US6037732A

公开(公告)日：2000-03-14

申请号：US63072

申请日：1998-04-21

申请人： Donald E. Alfano ,  Joseph J. Judkins, III ,  Quoi V. Huynh ,  Sang T. Ngo

发明人： Donald E. Alfano ,  Joseph J. Judkins, III ,  Quoi V. Huynh ,  Sang T. Ngo

IPC分类号： G05D23/19 ,  G05B5/00

CPC分类号： G05D23/1912 ,  Y10S388/903

摘要： A method for controlling the operation of a brushless DC fan for cooling heat generating components of a system is provided. The method includes providing a system temperature signal indicative of a system temperature and providing an intelligent shutdown enable signal. The system temperature signal is compared with a shutdown temperature signal if the intelligent shutdown enable signal has a first value. The shutdown temperature signal is representative of a shutdown temperature value. The fan is operated at a generally temperature proportional speed after comparing the system temperature signal with the shutdown temperature signal if the system temperature as indicated by the system temperature signal is greater than the shutdown temperature value as indicated by the shutdown temperature signal. A shutdown mode is entered by the fan after comparing the system temperature signal with the shutdown temperature signal if the system temperature as indicated by the system temperature signal is less than the shutdown temperature value as indicated by the shutdown temperature signal. The system temperature signal is compared with the shutdown temperature signal after entering the shutdown mode by the fan. Operation of the fan is initiated if the system temperature as indicated by the system temperature signal is greater than the shutdown temperature value as indicated by the shutdown temperature signal and the fan is in the shutdown mode.

摘要翻译： 提供了一种用于控制用于冷却系统的发热部件的无刷DC风扇的操作的方法。 该方法包括提供指示系统温度并提供智能关机使能信号的系统温度信号。 如果智能关机使能信号具有第一值，则将系统温度信号与停机温度信号进行比较。 停机温度信号代表关机温度值。 如果由系统温度信号指示的系统温度大于关闭温度信号所指示的关机温度值，则将系统温度信号与停机温度信号进行比较后，风扇以大致温度比例速度运行。 如果系统温度信号指示的系统温度低于关机温度信号所示的关机温度值，则将风扇信号与关机温度信号进行比较后，风扇进入关机模式。 系统温度信号与风扇进入关机模式后的关机温度信号进行比较。 如系统温度信号所示的系统温度大于关机温度信号所示的关机温度值，风扇处于关机模式，则开始运行风扇。

公开(公告)号：US6005374A

公开(公告)日：1999-12-21

申请号：US832580

申请日：1997-04-02

申请人： Ali Tasdighi

发明人： Ali Tasdighi

IPC分类号： G05F3/30 ,  G05F1/44

CPC分类号： G05F3/30

摘要： A programmable low dropout regulator includes an operational amplifier which is used both to provide a bandgap voltage and to drive an output load. In one embodiment implemented in an integrated circuit, external resistors are provided by the user to achieve a user-selected regulated voltage. In that embodiment, an input pin allows the user to select also internal resistors which provide a predetermined regulated voltage.

摘要翻译： 可编程低压差稳压器包括运算放大器，其用于提供带隙电压并驱动输出负载。 在集成电路中实现的一个实施例中，用户提供外部电阻以实现用户选择的调节电压。 在该实施例中，输入引脚允许用户也选择提供预定调节电压的内部电阻器。

公开(公告)号：US6122284A

公开(公告)日：2000-09-19

申请号：US889109

申请日：1997-07-07

申请人： Ali Tasdighi ,  Joseph J. Judkins, III ,  Chuong Nguyen ,  Donald E. Alfano

发明人： Ali Tasdighi ,  Joseph J. Judkins, III ,  Chuong Nguyen ,  Donald E. Alfano

IPC分类号： H04Q11/00

CPC分类号： H04Q11/04

摘要： In the preferred embodiment, the outputs of a plurality of analog signal generators are connected to a single wire (the analog bus). Each analog signal generator is addressable by a unique code provided to its respective address input terminals. A host controller selectively addresses only one of the analog signal generators such that an output of only one of the analog signal generators is applied to the analog bus at a time. In this manner, a single wire may be used to transmit a plurality of analog signals to a receiver. In one embodiment, the receiver is a MUX having an output connected to an ADC.

摘要翻译： 在优选实施例中，多个模拟信号发生器的输出端连接到单线（模拟总线）。 每个模拟信号发生器可通过提供给其相应地址输入端的唯一代码寻址。 主机控制器仅选择性地仅寻址模拟信号发生器中的一个，使得仅一个模拟信号发生器的输出一次被施加到模拟总线。 以这种方式，可以使用单根线将多个模拟信号发送到接收机。 在一个实施例中，接收器是具有连接到ADC的输出的MUX。

公开(公告)号：US5814995A

公开(公告)日：1998-09-29

申请号：US713575

申请日：1996-09-12

申请人： Ali Tasdighi

发明人： Ali Tasdighi

IPC分类号： G01R17/16 ,  G01R31/36 ,  G01N27/416

CPC分类号： G01R19/16542 ,  G01R17/16 ,  G01R15/04

摘要： A voltage detector is described herein which eliminates an entire operational amplifier or comparator from conventional voltage detectors. In one embodiment of such a voltage detector, a band gap reference generator is connected so as not to incorporate any feedback mechanism and where an off balance in the band gap reference generator is used to detect whether an input voltage falls below a threshold voltage. By eliminating the feedback path in the band gap reference generator, a comparator is eliminated. Other types of voltage detectors which provide a highly stable operation over a wide range of temperatures are described.

摘要翻译： 本文描述了一种电压检测器，其消除了来自常规电压检测器的整个运算放大器或比较器。 在这种电压检测器的一个实施例中，带隙参考发生器被连接成不包含任何反馈机构，并且其中使用带隙基准发生器中的关闭平衡来检测输入电压是否低于阈值电压。 通过消除带隙参考发生器中的反馈路径，消除了比较器。 描述了在宽范围的温度下提供高度稳定的操作的其他类型的电压检测器。

公开(公告)号：US20020109535A1

公开(公告)日：2002-08-15

申请号：US09780066

申请日：2001-02-09

申请人： TelCom Semiconductor, Inc.

发明人： Amado Caliboso

IPC分类号： H03L007/00

CPC分类号： H03K17/223

摘要： A power on reset circuit continuously asserts a reset output signal to a reset logic state (e.g., RESET) during the recovery of a power supply voltage from an inoperative voltage level, e.g., zero volts, to an operative minimum voltage level. The reset circuit continues to assert the reset output to the reset Logic State for an additional, active reset interval after the power supply voltage is above the minimum operative level. At the end of the additional active reset interval, the reset output is released to an operational logic level (e.g, NOT-RESET or RESETnull). Operative logic circuits receiving the reset output signal are thus provided with the active reset interval in which to perform their built-in reset functions after the power supply level is at or above the minimum operative level. At the expiration of the active reset interval, the power on reset circuit provides the subsequent operative circuits with the NON-RESET logic state to indicate normal operation can be resumed. The power on reset circuit has no continuous current paths between power supplies (other than negligible leakage currents) other than during the recovery time.

摘要翻译： 在将电源电压从不工作电压电平（例如零伏）恢复到操作最小电压电平期间，上电复位电路将复位输出信号连续地置为复位逻辑状态（例如，RESET）。 在电源电压高于最低工作电平之后，复位电路继续将复位输出置于复位逻辑状态，以获得额外的有效复位间隔。 在额外的有效复位间隔结束时，复位输出被释放到操作逻辑电平（例如NOT-RESET或RESET \）。 因此，接收复位输出信号的操作逻辑电路具有在电源电平处于或高于最低操作电平之后执行其内置复位功能的有效复位间隔。 在有效复位间隔期满时，上电复位电路为后续的操作电路提供NON-RESET逻辑状态，以指示正常操作可以恢复。 上电复位电路在恢复时间之外没有电源之间的连续电流路径（除可忽略的漏电流之外）。

公开(公告)号：US5734260A

公开(公告)日：1998-03-31

申请号：US703231

申请日：1996-08-26

申请人： Ali Tasdighi ,  Phong Nguyen

发明人： Ali Tasdighi ,  Phong Nguyen

IPC分类号： G05F3/30 ,  G05F3/16 ,  H02H7/20

CPC分类号： G05F3/30

摘要： A short-circuit protection circuit senses the output current of an output transistor to provide a control signal to a control transistor. The control transistor, in response to the control signal, varies an input voltage to an internal stage of an amplifier driving the output transistor, so as to cause the output transistor is switched off. A hysteresis resistor is coupled in series with an input terminal of the short circuit protection circuit, so as to prevent transient noise from switching off said output transistor.

摘要翻译： 短路保护电路检测输出晶体管的输出电流以向控制晶体管提供控制信号。 控制晶体管响应于控制信号，将输入电压改变为驱动输出晶体管的放大器的内部级，从而使输出晶体管截止。 滞后电阻与短路保护电路的输入端串联，以防止瞬态噪声关断所述输出晶体管。

公开(公告)号：US5719524A

公开(公告)日：1998-02-17

申请号：US540816

申请日：1995-10-11

申请人： Zhong Heng Mo ,  Brian Gillings

发明人： Zhong Heng Mo ,  Brian Gillings

IPC分类号： G05F3/26 ,  G05F1/10

CPC分类号： G05F3/262

摘要： An integrated circuit providing two output functions from a single output controlled by an input with a single switch responsive to an input level.

摘要翻译： 一个集成电路，通过一个输入控制的单个输出提供两个输出功能，一个响应输入电平的单个开关。

公开(公告)号：US5640084A

公开(公告)日：1997-06-17

申请号：US678013

申请日：1996-07-10

申请人： John P. Tero ,  Ali Tasdighi

发明人： John P. Tero ,  Ali Tasdighi

IPC分类号： G05F1/575 ,  G05F3/16

CPC分类号： G05F1/575

摘要： A fixed and a user adjustable voltage reference is alternatively provided by an integrated switch which switches between two current sources according to an input voltage. A fixed reference voltage is achieved by amplifying the current of one of the two current sources according to a predetermined voltage difference between the output terminal and an internal reference voltage. An adjustable reference voltage is achieved by amplifying the current of other of the two current sources according to a voltage difference between the internal reference voltage and an user adjustable voltage. In one embodiment, the user adjustable voltage is achieved by a user adjustable voltage divider circuit.

摘要翻译： 固定和用户可调参考电压由集成开关替代地提供，该开关根据输入电压在两个电流源之间切换。 通过根据输出端子和内部参考电压之间的预定电压差放大两个电流源之一的电流来实现固定的参考电压。 通过根据内部参考电压和用户可调节电压之间的电压差放大两个电流源中的其他电流的电流来实现可调参考电压。 在一个实施例中，用户可调电压由用户可调分压器电路实现。

公开(公告)号：US5576628A

公开(公告)日：1996-11-19

申请号：US316598

申请日：1994-09-30

申请人： Amado A. Caliboso ,  S. Fred Dabney, Jr.

发明人： Amado A. Caliboso ,  S. Fred Dabney, Jr.

IPC分类号： G01R27/26

CPC分类号： G01R27/2605

摘要： A capacitance measuring device incorporates the integrating analog-digital converter circuit of a handheld meter. The capacitance measuring device charges an unknown capacitance with a constant current until the voltage across the unknown capacitor reaches a predetermined voltage. At the same time, a reference voltage is applied to the input lead of an integrating circuit of the integrating analog-digital converter such that a corresponding proportional charge is stored in the feedback capacitor of the integrating circuit. The negative of the reference voltage is then applied to the integrating circuit so that charge is removed from the feedback capacitor at the same rate as the feedback capacitor was charged. A counter is used to determine the number of clock pulses it took to completely discharge the feedback capacitor and hence a reading of the unknown capacitance can be determined from the equation C.sub.X =I.sub.CHARGE *T.sub.2 /V.sub.TRIP.

摘要翻译： 电容测量装置包括手持式电表的集成模数转换电路。 电容测量装置以恒定电流对未知电容充电，直到未知电容器两端的电压达到预定电压。 同时，对积分模数转换器的积分电路的输入引线施加参考电压，使得对应的比例电荷存储在积分电路的反馈电容器中。 然后将参考电压的负值施加到积分电路，使得以与反馈电容器充电相同的速率从反馈电容器去除电荷。 计数器用于确定完全放电反馈电容器所需的时钟脉冲数，因此可以从等式CX = ICHARGE * T2 / VTRIP确定未知电容的读数。

公开(公告)号：US5512850A

公开(公告)日：1996-04-30

申请号：US316161

申请日：1994-09-30

申请人： Zhong H. Mo

发明人： Zhong H. Mo

IPC分类号： H03F3/72 ,  H03B1/00

CPC分类号： H03F3/72

摘要： A buffer circuit having both high gain and high slew rate is implemented using a high gain-low slew rate amplifier and a switch network. The buffer circuit's operation is divided into three periods. During the first period, the output of the amplifier is isolated from the load to allow the amplifier's output voltage to more quickly reaches its final voltage level. During the second period, the switch network couples the amplifier output lead to the load input lead where the amplifier drives the voltage at the load's input lead to a voltage substantially equal to the voltage of the input signal. During the third period, the switch network isolates the amplifier from the load and couples the load's input lead to a source of ground potential to quickly slew the load's input lead to ground potential.

摘要翻译： 具有高增益和高转换速率的缓冲电路使用高增益 - 低压摆率放大器和开关网络来实现。 缓冲电路的操作分为三个时期。 在第一阶段，放大器的输出与负载隔离，以使放大器的输出电压更快地达到其最终的电压电平。 在第二时段期间，开关网络将放大器输出引线耦合到负载输入引线，其中放大器驱动负载输入端的电压，导致电压基本上等于输入信号的电压。 在第三阶段，开关网络将放大器与负载隔离，并将负载的输入引线耦合到地电位，以快速将负载的输入引脚接地。