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：US6054823A

公开(公告)日：2000-04-25

申请号：US81309

申请日：1998-05-19

申请人： Jerry Collings ,  Chuong Nguyen ,  Joseph James Judkins, III ,  Donald E. Alfano ,  Ali Tasdighi ,  Quoi V. Huynh ,  Sang T. Ngo

发明人： Jerry Collings ,  Chuong Nguyen ,  Joseph James Judkins, III ,  Donald E. Alfano ,  Ali Tasdighi ,  Quoi V. Huynh ,  Sang T. Ngo

IPC分类号： F04D27/02 ,  H02H7/093 ,  H01R39/46

CPC分类号： H02H7/093 ,  F04D27/008

摘要： An apparatus for sensing the rotation of a brushless DC fan includes the fan and a sense/driver circuit and a capacitance. The sense/driver circuit is coupled to the fan to receive a sense input signal including a fluctuating electrical effect caused by fan commutation events. The sense/driver circuit processes the sense input signal to generate a sense output signal indicative of fan operation. The sense/driver circuit includes an integrated circuit. The integrated circuit includes a sense input pin, a ground return pin, a driver circuit, an integrated filter portion, a filter pin and a level detecting circuit. The capacitance is coupled to the filter pin to provide a filter with the integrated filter portion. The driver circuit includes a control terminal, a first current handling terminal coupled to the sense input pin and a second current handling terminal coupled to provide a ground return pat. The integrated filter portion includes a filter input coupled to at least one of the first and second current handling terminals of the driver circuit, and a filter output for providing a filter output signal to the level detecting circuit. The level detecting circuit generates the sense output signal from the filter output signal. The filter derives the filter output signal indicative of the fan commutation events responsive to receiving a signal at the sense input pin.

摘要翻译： 用于感测无刷直流风扇的旋转的装置包括风扇和感测/驱动器电路和电容。 感测/驱动器电路耦合到风扇以接收包括由风扇换向事件引起的波动电效应的感测输入信号。 感测/驱动电路处理感测输入信号以产生指示风扇操作的感测输出信号。 感测/驱动电路包括集成电路。 集成电路包括感测输入引脚，接地返回引脚，驱动器电路，集成滤波器部分，滤波器引脚和电平检测电路。 电容耦合到滤波器引脚以提供具有集成滤波器部分的滤波器。 驱动器电路包括控制端子，耦合到感测输入引脚的第一电流处理端子和耦合以提供接地回路的第二电流处理端子。 集成滤波器部分包括耦合到驱动器电路的第一和第二电流处理终端中的至少一个的滤波器输入和用于向电平检测电路提供滤波器输出信号的滤波器输出。 电平检测电路从滤波器输出信号产生感测输出信号。 响应于在感测输入引脚处接收到信号，滤波器导出指示风扇换向事件的滤波器输出信号。

公开(公告)号：US5923208A

公开(公告)日：1999-07-13

申请号：US713574

申请日：1996-09-12

申请人： Ali Tasdighi ,  Chuong Nguyen

发明人： Ali Tasdighi ,  Chuong Nguyen

IPC分类号： G01K7/01 ,  H01L35/00 ,  H03K3/42

CPC分类号： G01K7/01

摘要： A temperature-to-voltage converter includes a first circuit for developing a signal having a positive temperature coefficient and a second circuit for developing a signal having a voltage offset and a negative temperature coefficient. The converter also includes an adder circuit configured to subtract the negative-temperature-coefficient signal from the positive-temperature-coefficient signal. The resulting difference signal is a low voltage that exhibits linear temperature-to-voltage conversion, allowing the converter to be powered by a low operating voltage.

摘要翻译： 温度 - 电压转换器包括用于显影具有正温度系数的信号的第一电路和用于显影具有电压偏移和负温度系数的信号的第二电路。 该转换器还包括一个加法器电路，配置为从正温度系数信号中减去负温度系数信号。 所产生的差分信号是呈现线性温度 - 电压转换的低电压，允许转换器由低工作电压供电。

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：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：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：US5283579A

公开(公告)日：1994-02-01

申请号：US847458

申请日：1992-03-06

申请人： Ali Tasdighi ,  Roger A. Levinson ,  Quoi V. Huynh ,  John M. Caruso

发明人： Ali Tasdighi ,  Roger A. Levinson ,  Quoi V. Huynh ,  John M. Caruso

IPC分类号： H03M1/68 ,  H03M1/76 ,  H03M1/80 ,  H03M1/66

CPC分类号： H03M1/687 ,  H03M1/765 ,  H03M1/808

摘要： A digital to analog converter (DAC) incorporates a novel subranging voltage output DAC that delivers high multiplying bandwidth while consuming low power and requires small silicon area. The higher order digital input bits (MSBS) select a voltage range (VMSB) from a first resistor divider DAC network. The VMSB is then applied to the input of a small high speed low power differential input single ended output LSB programmable attenuator amplifier. Transistor follower devices effectively buffer the MSB section to the LSB section and increase bandwidth and speed of operation as well as permitting multichannel sharing of a single precision MSB voltage divider network.

摘要翻译： 数模转换器（DAC）集成了一种新颖的基极电压输出DAC，可在消耗低功耗的同时提供高倍增带宽，并需要较小的硅面积。 高阶数字输入位（MSBS）从第一个电阻分压器DAC网络中选择一个电压范围（VMSB）。 然后将VMSB应用于小型高速低功耗差分输入单端输出LSB可编程衰减放大器的输入。 晶体管跟随器件有效地将MSB部分缓冲到LSB部分，并增加了带宽和运行速度，并允许单个精度MSB分压器网络的多通道共享。

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：US5294927A

公开(公告)日：1994-03-15

申请号：US868070

申请日：1992-04-13

申请人： Roger A. Levinson ,  John M. Caruso ,  Ali Tasdighi

发明人： Roger A. Levinson ,  John M. Caruso ,  Ali Tasdighi

IPC分类号： H03M1/68 ,  H03M1/76

CPC分类号： H03M1/682 ,  H03M1/765

摘要： A digital to analog converter employs an operational amplifier as an active summing device for summing a first analog voltage corresponding to most significant bits of a digital value and a second analog voltage corresponding to least significant bits of the digital value. In a multi-channel application, a single MSB DAC can be shared by all channels through first MUXs in each channel with each channel having an independent LSB DAC. Alternatively, a single LSB DAC can be shared by all channels through second MUXs in each channel. Gain of the voltage summing operational amplifier in each channel is determined by values of a resistor connecting the output of the LSB DAC to the inverting negative input of the operational amplifier and of a feedback resistor connecting the amplifier output to the inverting negative input.

摘要翻译： 数模转换器采用运算放大器作为有源求和装置，用于将对应于数字值的最高有效位的第一模拟电压与对应于数字值的最低有效位的第二模拟电压相加。 在多通道应用中，单个MSB DAC可以通过每个通道中的第一个MUX通过所有通道共享，每个通道具有独立的LSB DAC。 或者，单个LSB DAC可以通过每个通道中的第二MUX由所有通道共享。 每个通道中电压求和运算放大器的增益由连接LSB DAC的输出到运算放大器的反相负输入的电阻值以及将放大器输出连接到反相负输入的反馈电阻决定。

公开(公告)号：US4677369A

公开(公告)日：1987-06-30

申请号：US778444

申请日：1985-09-19

申请人： Derek F. Bowers ,  Ali Tasdighi

发明人： Derek F. Bowers ,  Ali Tasdighi

IPC分类号： H01L27/04 ,  G05F1/56 ,  G05F3/18 ,  H01L21/822 ,  H01L29/864 ,  H01L29/866 ,  H03K3/26 ,  G05F3/16 ,  H01L27/02 ,  H01L29/90

CPC分类号： G05F3/18 ,  Y10S323/907

摘要： A temperature insensitive voltage reference is described which can advantageously be implemented using standard CMOS processing techniques. A pair of parasitic bipolar transistors are coupled with appropriate resistors to produce a voltage with a temperature coefficient that is equal in value but of opposite polarity to a zener diode voltage-temperature coefficient. This voltage is then combined with a zener diode voltage to yield the desired output reference voltage.

摘要翻译： 描述了温度不敏感的电压参考，其可以有利地使用标准CMOS处理技术来实现。 一对寄生双极晶体管与适当的电阻器耦合以产生具有与齐纳二极管电压 - 温度系数相反的值但与极性相反的温度系数的电压。 然后将该电压与齐纳二极管电压组合以产生所需的输出参考电压。