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公开(公告)号：US06621299B1
公开(公告)日：2003-09-16
申请号：US09849640
申请日：2001-05-04
申请人： Todd A. Randazzo , Matthew J. Russell , Kenneth S. Szajda , Jonathan A. Schmitt , Kenneth G. Richardson , Timothy P. McGonagle
发明人： Todd A. Randazzo , Matthew J. Russell , Kenneth S. Szajda , Jonathan A. Schmitt , Kenneth G. Richardson , Timothy P. McGonagle
IPC分类号： H03K1900
CPC分类号： H03K19/003
摘要： An integrated circuit having input output buffers, where the integrated circuit is powered by at least a core power supply and an input output power supply. A level shifter receives an active low signal that indicates that the core power supply has powered down. The level shifter then outputs a known state upon receipt of the active low signal. A control circuit receives the known state form the level shifter, and then tristates the input output buffers upon receipt of the known state.
摘要翻译： 一种具有输入输出缓冲器的集成电路，其中集成电路至少由核心电源和输入输出电源供电。 电平移位器接收到指示核心电源已断电的低电平有效信号。 然后，电平移位器在接收到有效低电平信号时输出已知状态。 控制电路接收电平移位器的已知状态，然后在接收到已知状态时将输入输出缓冲器三态化。
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公开(公告)号：US5952892A
公开(公告)日：1999-09-14
申请号：US939586
申请日：1997-09-29
申请人： Kenneth S. Szajda
发明人： Kenneth S. Szajda
CPC分类号： H03K3/0231 , H03L7/0995 , H03L7/14 , H03L7/087 , H03L7/0891 , H04L7/033
摘要： A low-gain, low-jitter VCO circuit implemented in CMOS provides center frequency adjustment to overcome process variations. Further, noise immunity is improved by using a separate feedback loop to provide the nominal current biasing for the oscillator chain. This feedback loop coarsely sets the center frequency. The actual control of the oscillation frequency is achieved by a second current source, whose output is added to the nominal bias current to provide a total bias to the oscillator. This second current source "fine tunes" the oscillator frequency responsive to a control signal. Because two separate current sources are used, the circuit can realize a high oscillation frequency with a low VCO gain. Another feature provides for adjusting the center frequency in response to a digital input word provided via external pins, or from internal logic or memory. The center frequency thus can be calibrated by measurement at the time of manufacture, or changes later by the end user or by other circuitry.
摘要翻译： 在CMOS中实现的低增益，低抖动VCO电路提供中心频率调整以克服过程变化。 此外，通过使用单独的反馈回路来提供用于振荡器链的额定电流偏置来提高抗噪声性。 该反馈回路粗略地设定中心频率。 振荡频率的实际控制是通过第二个电流源来实现的，其第二个电流源的输出被加到标称偏置电流上，以向振荡器提供总偏置。 该第二电流源响应于控制信号“微调”振荡器频率。 由于使用两个独立的电流源，所以该电路可以实现具有低VCO增益的高振荡频率。 另一个特征提供了响应于通过外部引脚提供的数字输入字，或从内部逻辑或存储器调整中心频率。 因此，中心频率可以通过在制造时的测量来校准，或者由最终用户或其他电路改变。
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公开(公告)号：US5546041A
公开(公告)日：1996-08-13
申请号：US102620
申请日：1993-08-05
申请人： Kenneth S. Szajda
发明人： Kenneth S. Szajda
摘要： A circuit for sensing a parameter, such as temperature, has a single current source and a mismatched differential pair for providing two different currents at a desired current ratio. Each current is provided to a current control element and a sensing element, each of which may be diodes. An operational amplifier closes the loop and feeds back a signal from the input of the current control elements to the differential pair to hold the desired current ratio constant. Chopper circuitry is employed with the amplifier to reduce the offset and low frequency noise contribution of the amplifier.
摘要翻译： 用于感测诸如温度的参数的电路具有单个电流源和不匹配的差分对，用于以期望的电流比率提供两个不同的电流。 每个电流被提供给电流控制元件和感测元件，每个电流元件可以是二极管。 运算放大器闭合回路并将来自当前控制元件的输入的信号反馈到差分对以保持期望的电流比恒定。 放大器采用斩波电路，以减小放大器的偏移和低频噪声贡献。
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