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公开(公告)号：US06885247B2
公开(公告)日：2005-04-26
申请号：US10013214
申请日：2001-12-07
Applicant: Michael J. Callahan, Jr.
Inventor： Michael J. Callahan, Jr.
CPC classification number: H03F3/082
Abstract: A current amplifier comprising an amplifier circuit with overall negative feedback and an output current amplification circuit. In one embodiment, a photodiode provides a current to be amplified and the amplifier circuit and the output current amplification circuit are implemented using MOS technology.
Abstract translation: 一种电流放大器，包括具有总体负反馈的放大器电路和输出电流放大电路。 在一个实施例中，光电二极管提供待放大的电流，并且使用MOS技术来实现放大器电路和输出电流放大电路。
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2.发明授权公开(公告)号：US06411159B1
公开(公告)日：2002-06-25
申请号：US09620786
申请日：2000-07-21
Applicant: Michael J. Callahan, Jr.
Inventor： Michael J. Callahan, Jr.
IPC: G06G726
CPC classification number: G05F3/242
Abstract: A method and circuit are disclosed for controlling the current level of a differential logic circuit having a current source, input transistors which perform current steering based upon the input to the differential logic circuit, and load transistors. The circuit includes a first transistor that forms a current mirror with the current source, a second transistor coupled to the load transistors so that the operating characteristics of the load transistors substantially match the operating characteristics of the second transistor, and current source circuitry coupled between the first and second transistors. The current level selected in the current source circuitry sets the current level in the differential logic circuit and the resistance of the load transistors so that the output voltage swing of the differential logic circuit stays within an acceptable range of voltages, regardless of the selected current level.
Abstract translation: 公开了一种用于控制具有电流源的差分逻辑电路的电流电平的方法和电路，基于对差分逻辑电路的输入和负载晶体管执行电流转向的输入晶体管。 电路包括与电流源形成电流镜的第一晶体管，耦合到负载晶体管的第二晶体管，使得负载晶体管的工作特性基本上与第二晶体管的工作特性相匹配，并且电流源电路 第一和第二晶体管。 在电流源电路中选择的电流电平设置差分逻辑电路中的电流电平和负载晶体管的电阻，使得差分逻辑电路的输出电压摆幅保持在可接受的电压范围内，而与所选电流水平无关 。
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公开(公告)号：US07420763B2
公开(公告)日：2008-09-02
申请号：US11391185
申请日：2006-03-27
Applicant: Michael J. Callahan, Jr.
Inventor： Michael J. Callahan, Jr.
CPC classification number: G11B5/59605
Abstract: A servo control circuit provides seamless transition between seek and track modes while enabling both rapid seek mode operation and accurate tracking. The control circuit includes an analog-to-digital converter having a non-linear characteristic. The non-linear characteristic provides disproportionately large control voltages to derive speed and settling in the seek mode and essentially linear control voltages in the track mode to provide low noise and accurate tracking operation.
Abstract translation: 伺服控制电路提供搜索和跟踪模式之间的无缝转换，同时实现快速寻道模式操作和精确跟踪。 控制电路包括具有非线性特性的模数转换器。 非线性特性提供不成比例的大的控制电压，以在寻轨模式下导出速度和稳定，并且在轨道模式中提供基本上线性的控制电压，以提供低噪声和精确的跟踪操作。
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公开(公告)号：US06900672B2
公开(公告)日：2005-05-31
申请号：US10401623
申请日：2003-03-28
Applicant: Michael J. Callahan, Jr.
Inventor： Michael J. Callahan, Jr.
CPC classification number: H03K17/166 , H03K4/502 , H03K5/08 , H03K5/13
Abstract: Methods and structures for ensuring the highly linear discharge of a capacitor used for slew rate control of a power driving stage from a maximum voltage to a minimum supply voltage, such as ground. A voltage ramp generator uses a single cascoded current source to achieve the linear ramp-down.
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公开(公告)号：US5852359A
公开(公告)日：1998-12-22
申请号：US889816
申请日：1997-07-08
Applicant: Michael J. Callahan, Jr. , William E. Edwards
Inventor： Michael J. Callahan, Jr. , William E. Edwards
Abstract: A voltage regulator with load pole stabilization is disclosed. The voltage regulator consists of an error amplifier, an integrator which includes a switched capacitor, a pass transistor, and a feedback circuit. In one embodiment, the integrator circuit includes an amplifier, a capacitor, and a switched capacitor which is driven by a voltage controlled oscillator. The voltage controlled oscillator changes its frequency of oscillation proportional to the output current. In another embodiment, the switched capacitor is driven by a current controlled oscillator whose frequency of oscillation is also proportional to the output current of the voltage regulator. When the output current demand is large, the controlled oscillators increase the frequency which decreases the effective resistance of the switched capacitor thereby changing the frequency of the zero to respond to the change in the load pole. Conversely, the effective resistance is increased as the current demand is decreased, also to respond to the decrease in load pole. The controlled oscillator may be coupled to a current sensing device that generates a scaled version of the load current and couples to the regulated voltage output. The controlled oscillator is restricted to operating voltages that are related to the regulated output voltage and a control current that is a scaled version of the load current. Consequently, the disclosed voltage regulator has high stability without consuming excess power.
Abstract translation: 公开了一种具有负载极稳定性的电压调节器。 电压调节器由误差放大器，包括开关电容器，传输晶体管和反馈电路的积分器组成。 在一个实施例中，积分器电路包括由压控振荡器驱动的放大器，电容器和开关电容器。 压控振荡器的振荡频率与输出电流成正比。 在另一个实施例中，开关电容器由电流控制振荡器驱动，其振荡频率也与电压调节器的输出电流成比例。 当输出电流需求量大时，受控振荡器增加了降低开关电容器的有效电阻的频率，从而改变零频率以响应负载极点的变化。 相反，随着电流需求的降低，有效电阻也随着负载极点的减小而增加。 受控振荡器可以耦合到电流感测装置，其产生负载电流的缩放版本并耦合到稳压电压输出。 受控振荡器仅限于与稳压输出电压相关的工作电压以及作为负载电流缩放版本的控制电流。 因此，所公开的电压调节器具有高稳定性，而不消耗多余的功率。
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Patent Agency Ranking
公开(公告)号：US5719591A
公开(公告)日：1998-02-17
申请号：US456068
申请日：1995-05-31
Applicant: Michael J. Callahan, Jr. , Christopher A. Ludden
Inventor： Michael J. Callahan, Jr. , Christopher A. Ludden
CPC classification number: G09G3/2011 , G09G3/3688 , G09G3/3696 , G09G2310/027 , G09G2310/0281 , G09G2310/0289
Abstract: The present invention relates to a signal driver circuit for driving a liquid crystal display panel. The signal driver circuit provides level shifting within the circuit to lower the power consumption of a liquid crystal display module while still providing a wide analog voltage range to the liquid crystal display elements. The decoding circuits utilize a strand of abutting decode input transistors which are connected in series. Further to reduce the physical size of the decoding circuits, multiple decode circuits may share circuitry that decodes the most significant bits of a data word. A cell layout is utilized such that the most significant bits data are bused into the cell through metal lines and the least significant bits are bused in polysilicon that also operates as the gate of the decode input transistors. Moreover, the decode cell input transistors may all be of the same conductivity type.
Abstract translation: 本发明涉及用于驱动液晶显示面板的信号驱动电路。 信号驱动器电路在电路内提供电平移位以降低液晶显示模块的功耗，同时仍向液晶显示元件提供宽的模拟电压范围。 解码电路利用串联连接的解码输入晶体管。 为了减少解码电路的物理尺寸，多个解码电路可以共享解码数据字的最高有效位的电路。 利用单元格布局，使得最高有效位数据通过金属线被插入到单元中，并且最低有效位被叠加在也用作解码输入晶体管的栅极的多晶硅中。 此外，解码单元输入晶体管可以都是相同的导电类型。
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7.发明授权Driver circuit having a slew rate control system with improved linear ramp generator including ground 有权驱动器电路具有压摆率控制系统，其具有改进的线性斜坡发生器，包括接地公开(公告)号：US06586980B1
公开(公告)日：2003-07-01
申请号：US09540865
申请日：2000-03-31
Applicant: Michael J. Callahan, Jr.
Inventor： Michael J. Callahan, Jr.
IPC: H03K512
CPC classification number: G05F3/262 , G11B19/28 , H03K4/50 , H03K4/502 , H03K17/166
Abstract: Methods and structures for ensuring the highly linear discharge of a capacitor used for slew rate control of a power driving stage from a maximum voltage to a minimum supply voltage, such as ground. A voltage ramp generator uses a single cascoded current source to achieve the linear ramp-down.
Abstract translation: 用于确保用于从最大电压到最小电源电压（例如地）的功率驱动级的转换速率控制的电容器的高度线性放电的方法和结构。 电压斜坡发生器使用单个级联电流源来实现线性斜坡下降。
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公开(公告)号：US6104249A
公开(公告)日：2000-08-15
申请号：US225841
申请日：1998-12-31
Applicant: Michael J. Callahan, Jr.
Inventor： Michael J. Callahan, Jr.
CPC classification number: H03F1/223
Abstract: An integrated circuit includes a transconductance circuit having a bias current generator coupled to a power supply. The bias current generator may include a current mirror circuit having an input and an output, where a current at the output is proportional to a current at the input. A first constant current source in the transconductance circuit has a first electrode coupled to the power supply. The transconductance circuit also includes first and second transistors and a diode. The diode is forward biased by the bias current generator. The first transistor has a collector coupled to a second electrode of the first constant current source and to a signal output. The second transistor has a drain coupled to an emitter of the first transistor, a source coupled to a reference voltage and a gate coupled to a signal input. The diode has an anode coupled to a base of the first transistor and a cathode coupled to a constant voltage source. The current through the diode results in a drain-source voltage of the second transistor being constant. As a result, the transconductance circuit operation is linearized, and distortion due to drain-source voltage variation in the second transistor is reduced.
Abstract translation: 集成电路包括具有耦合到电源的偏置电流发生器的跨导电路。 偏置电流发生器可以包括具有输入和输出的电流镜电路，其中输出处的电流与输入处的电流成比例。 跨导电路中的第一恒定电流源具有耦合到电源的第一电极。 跨导电路还包括第一和第二晶体管和二极管。 二极管由偏置电流发生器正向偏置。 第一晶体管具有耦合到第一恒流源的第二电极和信号输出的集电极。 第二晶体管具有耦合到第一晶体管的发射极的漏极，耦合到参考电压的源极和耦合到信号输入的栅极。 二极管具有耦合到第一晶体管的基极和耦合到恒定电压源的阴极的阳极。 通过二极管的电流导致第二晶体管的漏 - 源电压恒定。 结果，跨导电路操作被线性化，并且由于第二晶体管中的漏极 - 源极电压变化引起的失真减小。
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9.发明授权DC-to-DC converter with soft-start error amplifier and associated method 失效具有软启动误差放大器的DC-DC转换器及相关方法
公开(公告)号：US5917313A
公开(公告)日：1999-06-29
申请号：US994923
申请日：1997-12-19
Applicant: Michael J. Callahan, Jr.
Inventor： Michael J. Callahan, Jr.
CPC classification number: H02M1/36 , H03K4/023 , Y10S323/901
Abstract: A DC-to-DC converter includes an error amplifier; a ramp generator for generating a ramp signal at the first input of the error amplifier independent of the output of the error amplifier and so that the output of the error amplifier ramps up at a relatively slow rate to avoid overshoot of the desired output voltage of the converter during the start-up phase of the converter; and a ramp disable circuit for disabling the ramp signal upon reaching a value corresponding to the normal operating phase of the converter. The DC-to-DC converter preferably includes at least one power switch and pulse width modulation (PWM) control circuit cooperating with the power switch to provide a desired output voltage of the converter. The ramp generator in one embodiment comprises a current source and an external capacitor connected thereto. In yet another embodiment, the ramp generator may be provided by a staircase ramp generator comprising an amplifier and an integrating capacitor connected thereto. A power-on-reset (POR) circuit is also preferably provided for discharging the integrating capacitor until the start-up phase of the converter.
Abstract translation: DC-DC转换器包括误差放大器; 斜坡发生器，用于在误差放大器的输出端产生斜坡信号，该误差放大器的第一输入端与误差放大器的输出无关，并且误差放大器的输出以相对较慢的速率上升，以避免所需输出电压的过冲 转换器在启动阶段的转换器; 以及斜坡禁用电路，用于在达到与转换器的正常工作相位相对应的值时禁用斜坡信号。 DC-DC转换器优选地包括与功率开关配合的至少一个功率开关和脉宽调制（PWM）控制电路，以提供转换器的期望的输出电压。 一个实施例中的斜坡发生器包括电流源和与其连接的外部电容器。 在另一个实施例中，斜坡发生器可以由包括放大器和连接到其的积分电容器的阶梯斜坡发生器提供。 还优选地提供上电复位（POR）电路用于将积分电容器放电直到转换器的启动阶段。
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公开(公告)号：US5574475A
公开(公告)日：1996-11-12
申请号：US138366
申请日：1993-10-18
Applicant: Michael J. Callahan, Jr. , Christopher A. Ludden
Inventor： Michael J. Callahan, Jr. , Christopher A. Ludden
CPC classification number: G09G3/2011 , G09G3/3688 , G09G3/3696 , G09G2310/027 , G09G2310/0289
Abstract: The present invention relates to a signal driver circuit for driving a liquid crystal display panel. The signal driver circuit provides level shifting within the circuit to lower the power consumption of a liquid crystal display module while still providing a wide analog voltage range to the liquid crystal display elements. Furthermore, reference voltages are provided to decoding circuits by using distributed resistors. The decoding circuits utilize a cell layout that allows data to bused into the cell through polysilicon that also operates as the gate of the decode input transistors. The decode input transistors are arranged in strands of abutting transistors which may be connected in series or in parallel. Moreover, the decode cell input transistors may all be of the same conductivity type.
Abstract translation: 本发明涉及用于驱动液晶显示面板的信号驱动电路。 信号驱动器电路在电路内提供电平移位以降低液晶显示模块的功耗，同时仍向液晶显示元件提供宽的模拟电压范围。 此外，通过使用分布式电阻将参考电压提供给解码电路。 解码电路利用单元布局，其允许数据通过也用作解码输入晶体管的栅极的多晶硅被引入单元。 解码输入晶体管布置成可以串联或并联连接的邻接晶体管。 此外，解码单元输入晶体管可以都是相同的导电类型。
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