High order multi-path operational amplifier with reduced input referred offset
    1.
    发明授权
    High order multi-path operational amplifier with reduced input referred offset 有权
    高阶多径运算放大器,具有减少的输入参考偏移

    公开(公告)号:US06466091B1

    公开(公告)日:2002-10-15

    申请号:US09678160

    申请日:2000-10-02

    IPC分类号: H03F368

    摘要: Disclosed in this application is the placement of an additional integrator between the first stage integrator output and the input to the attenuator/low pass filter. This approach reduces the input referred offset by a factor equal to the gain of the additional integrator, and the offset of the additional integrator itself will be divided by the gain of the first-stage integrator.

    摘要翻译: 在本申请中公开了在第一级积分器输出和衰减器/低通滤波器的输入之间放置附加积分器。 该方法将输入参考偏移减少了等于附加积分器的增益的因子,并且附加积分器本身的偏移将除以第一级积分器的增益。

    Non-invasive, low pin count test circuits and methods
    4.
    发明授权
    Non-invasive, low pin count test circuits and methods 有权
    非侵入性,低引脚数测试电路和方法

    公开(公告)号:US07639002B1

    公开(公告)日:2009-12-29

    申请号:US11410362

    申请日:2006-04-25

    IPC分类号: G01R31/28

    CPC分类号: G01R31/31707

    摘要: A method of testing an integrated circuit including a plurality of test nodes includes initiating a test mode and, during a first time interval of the test mode, stepping a level of a supply current of the integrated circuit to a calibration level. Parameters are observed at the plurality of test nodes to detect errors during a second time interval of the test mode and the level of the supply current selectively stepped in response to a number of errors detected. The level of the supply current is decoded to identify the detected errors.

    摘要翻译: 一种测试包括多个测试节点的集成电路的方法包括启动测试模式,并且在测试模式的第一时间间隔期间,使集成电路的电源电平的级别达到校准水平。 在多个测试节点处观察参数以在测试模式的第二时间间隔期间检测错误,并且响应于检测到的错误的数量选择性地步进电源电平。 电源电流的电平被解码以识别检测到的错误。

    Internal node offset voltage test circuits and methods
    5.
    发明授权
    Internal node offset voltage test circuits and methods 有权
    内部节点偏移电压测试电路及方法

    公开(公告)号:US06885211B1

    公开(公告)日:2005-04-26

    申请号:US10117374

    申请日:2002-04-05

    IPC分类号: G01R31/28 G01R31/26

    CPC分类号: G01R31/2837

    摘要: A method of testing an integrated circuit includes setting a guardbanded limit for a parameter associated with an embedded node, a deviation from the guardbanded limit under a set of test conditions correlated with a failure of the integrated circuit across a range of operating conditions. A test is performed under the test conditions to detect deviations of the parameter from the guardbanded limit to detect failures of the integrated circuit over the range of operating conditions.

    摘要翻译: 一种测试集成电路的方法包括设置与嵌入式节点相关联的参数的保护限值,与在整个操作条件范围内的集成电路的故障相关的一组测试条件下的保护带限制的偏差。 在测试条件下进行测试,以检测参数与防护带限制的偏差,以检测集成电路在工作条件范围内的故障。

    High order multi-path operational amplifier with output saturation recovery
    6.
    发明授权
    High order multi-path operational amplifier with output saturation recovery 失效
    具有输出饱和恢复功能的高阶多径运算放大器

    公开(公告)号:US06515540B1

    公开(公告)日:2003-02-04

    申请号:US10013559

    申请日:2001-12-10

    IPC分类号: H03F102

    CPC分类号: H03F3/72 H03F1/086

    摘要: An amplifier is disclosed including multiple integrator stages. The amplifier includes a low-frequency path from a signal input to a signal output and relatively higher-frequency bypass paths around the first integrator stage. The paths converge at a summing node. To prevent instability when the integrators are saturated by large signals, the circuit includes a saturation detector which disables the relatively low-frequency paths during such saturation conditions.

    摘要翻译: 公开了包括多个积分器级的放大器。 放大器包括从信号输入到信号输出的低频路径和围绕第一积分器级的相对较高频率的旁路路径。 路径收敛在求和节点处。 为了防止当积分器被大信号饱和时的不稳定性,该电路包括饱和检测器,其在这种饱和状态期间禁用相对低频路径。

    Amplifier circuits and methods of amplifying an input signal
    7.
    发明授权
    Amplifier circuits and methods of amplifying an input signal 有权
    放大器电路和放大输入信号的方法

    公开(公告)号:US08952751B2

    公开(公告)日:2015-02-10

    申请号:US13732135

    申请日:2012-12-31

    IPC分类号: H03F1/02 H03F3/00 H03F3/45

    摘要: A method of operating an amplifier circuit having a pre-charge phase and a sample/conversion phase includes, during a pre-charge phase, charging first and second capacitors to first and second bias voltages. The first capacitor is coupled to a first input of an amplifier circuit, which has a second input and an output. The second capacitor is coupled to the second input. During a sample/conversion phase, the first input of the amplifier circuit is coupled to an input signal through the first capacitor to level-shift the input signal according to the first bias voltage and the output of the amplifier is coupled to the second input through the second capacitor to level shift a feedback signal according to the second bias voltage.

    摘要翻译: 操作具有预充电阶段和采样/转换阶段的放大器电路的方法包括在预充电阶段期间将第一和第二电容器充电到第一和第二偏置电压。 第一电容器耦合到具有第二输入和输出的放大器电路的第一输入端。 第二电容器耦合到第二输入端。 在采样/转换阶段期间,放大器电路的第一输入通过第一电容耦合到输入信号,以根据第一偏置电压对输入信号进行电平移位,并且放大器的输出端通过 所述第二电容器根据所述第二偏置电压对反馈信号进行电平移位。

    Relaxation Oscillator
    8.
    发明申请
    Relaxation Oscillator 有权
    放松振荡器

    公开(公告)号:US20140176250A1

    公开(公告)日:2014-06-26

    申请号:US13721885

    申请日:2012-12-20

    IPC分类号: H03K3/011

    CPC分类号: H03K3/0231

    摘要: In an embodiment, a method includes: during a first portion of a cycle of a clock signal generated by an oscillator, pre-charging a first capacitor of a first switched capacitor stage until a first comparator determines that a first node voltage of the first switched capacitor stage is greater than a first reference voltage at a first reference voltage node; applying a second reference voltage to the first reference voltage node; and responsive to a first edge of the clock signal, charging the first capacitor until the first comparator determines that the first node voltage is greater than the second reference voltage at the first reference voltage node.

    摘要翻译: 在一个实施例中,一种方法包括:在由振荡器产生的时钟信号的周期的第一部分期间,对第一开关电容器级的第一电容器进行预充电,直到第一比较器确定第一开关的第一节点电压 电容器级大于第一参考电压节点处的第一参考电压; 将第二参考电压施加到所述第一参考电压节点; 并且响应于所述时钟信号的第一边沿,对所述第一电容器充电直到所述第一比较器确定所述第一节点电压大于所述第一参考电压节点处的所述第二参考电压。

    Schmitt trigger with gated transition level control
    9.
    发明授权
    Schmitt trigger with gated transition level control 有权
    施密特触发器具有门控过渡电平控制

    公开(公告)号:US08203370B2

    公开(公告)日:2012-06-19

    申请号:US12494621

    申请日:2009-06-30

    IPC分类号: H03K3/00

    CPC分类号: H03K3/3565 H03K5/088

    摘要: A Schmitt trigger comprises first and second circuitry. The first circuitry receives an input voltage and provides an output voltage at either a logical “low” or a logical “high” voltage level responsive to the input voltage and a first bias voltage. The second circuitry connects to the first circuitry to generate a second bias current for generating the output voltage. The second bias current is larger than the first bias current. The Schmitt trigger operates in a low power mode of operation using only the first bias voltage to maintain the logical “low” voltage level or the logical “high” voltage level at a substantially constant level. In a high power mode of operation the Schmitt trigger uses the second bias voltage during transition periods between the logical “low” voltage level and the logical “high” voltage level.

    摘要翻译: 施密特触发器包括第一和第二电路。 第一电路接收输入电压并且响应于输入电压和第一偏置电压在逻辑“低”或逻辑“高”电压电平提供输出电压。 第二电路连接到第一电路以产生用于产生输出电压的第二偏置电流。 第二偏置电流大于第一偏置电流。 施密特触发器仅在第一偏置电压下工作在低功耗工作模式,以将逻辑“低”电压电平或逻辑“高”电压电平维持在基本恒定的水平。 在高功率工作模式下,施密特触发器在逻辑“低”电压电平和逻辑“高”电压电平之间的过渡期间使用第二偏置电压。

    Phase error cancellation
    10.
    发明授权
    Phase error cancellation 有权
    相位误差消除

    公开(公告)号:US07834706B2

    公开(公告)日:2010-11-16

    申请号:US11571077

    申请日:2005-06-28

    IPC分类号: H03L7/00

    CPC分类号: H03L7/0891 H03L7/1976

    摘要: A noise cancellation signal is generated for a fractional-N phase-locked loop (200). A divide value is provided to a first delta sigma modulator circuit (203), which generates a divide control signal to control a divide value of a feedback divider (208) in the phase-locked loop. An error term (e) is generated that is indicative of a difference between the generated divide control signal and the divide value supplied to the first delta sigma modulator circuit. The error term is integrated in an integrator (320) to generate an integrated error term (x), where xk+1=xk+ek; and a phase error correction circuit (209) utilizes the error term ek and the integrated error term xk to generate the phase error cancellation signal.

    摘要翻译: 对于分数N锁相环(200)产生噪声消除信号。 分频值被提供给第一ΔΣ调制器电路(203),其产生除法控制信号以控制锁相环中的反馈分频器(208)的除法值。 生成指示所生成的除法控制信号和提供给第一ΔΣ调制器电路的除法值之间的差异的误差项(e)。 误差项集成在积分器(320)中以产生积分误差项(x),其中xk + 1 = xk + ek; 并且相位误差校正电路(209)利用误差项ek和积分误差项xk来产生相位误差消除信号。