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    • 7. 发明授权
    • Method and low voltage CMOS circuit for generating voltage and current references
    • 用于产生电压和电流参考的方法和低压CMOS电路
    • US06859092B2
    • 2005-02-22
    • US10418569
    • 2003-04-17
    • Eric John LukesPatrick Lee RosnoJames David StromDana Marie Woeste
    • Eric John LukesPatrick Lee RosnoJames David StromDana Marie Woeste
    • G05F1/46G05F1/10G05F3/02
    • G05F1/46
    • A method and a low voltage, complementary metal oxide semiconductor (CMOS) circuit are provided for generating voltage and current references with a low voltage power supply. A voltage generating circuit provides a voltage reference and is formed by a plurality of CMOS transistors and a resistor. An operational amplifier includes a differential pair of CMOS transistors. The first voltage reference is applied to an input of the differential pair of transistors and an output of the differential pair of transistors providing a second voltage reference. The operational amplifier includes a plurality of current reference transistors. A first voltage generating circuit generates a first voltage and a second voltage generating circuit generating a second voltage. The first and second voltage generating circuits are formed by a plurality of CMOS transistors. The generated first and second voltages are applied to the voltage reference generating circuit and current reference transistors.
    • 提供一种方法和低电压互补金属氧化物半导体(CMOS)电路,用于利用低电压电源产生电压和电流参考。 电压产生电路提供电压参考,并由多个CMOS晶体管和电阻器形成。 运算放大器包括一对差分CMOS晶体管。 第一参考电压被施加到晶体管的差分对的输入和提供第二电压基准的晶体管的差分对的输出。 运算放大器包括多个电流参考晶体管。 第一电压产生电路产生产生第二电压的第一电压和第二电压产生电路。 第一和第二电压产生电路由多个CMOS晶体管形成。 产生的第一和第二电压被施加到电压参考产生电路和电流参考晶体管。
    • 9. 发明授权
    • Digitally controlled differential delay line circuit and method of
controlling same
    • 数字控制差动延迟线电路及其控制方法
    • US6060939A
    • 2000-05-09
    • US176140
    • 1998-10-21
    • Dana Marie WoesteJames David Strom
    • Dana Marie WoesteJames David Strom
    • H03H11/26H03K17/62
    • H03H11/265
    • An apparatus and method for delaying a signal using a variable delay line circuit. A variable delay line circuit includes first and second delay lines, each including a plurality of delay elements. A multiplexer is coupled to respective outputs of the first and second delay lines and selectively couples the output of one of the first or second delay lines to an output of the multiplexer. A control circuit is coupled to the multiplexer and the first and second delay lines, and controls the multiplexer so as to produce a delayed signal at the multiplexer output using one of the first or second delay lines, and changes a delay factor of the other one of the first or second delay lines by varying a resistance and a current of one or more delay elements of the other one of the first or second delay lines. A reference voltage source is coupled to each of the delay elements and provides a reference voltage maintained at a substantially constant amplitude with respect to the power supply to each of the delay elements. The delayed signal may be a differential signal. Each of the delay elements may include one or more adjustable loads or adjustable current sources. An adjustable load may be implemented using P-FETs. In one embodiment, at least one of the delay elements of the first and second delay lines includes a plurality of selectable delay devices, each of which is associated with one of a plurality of selectable delay factors.
    • 一种使用可变延迟线电路来延迟信号的装置和方法。 可变延迟线电路包括第一和第二延迟线,每条延迟线包括多个延迟元件。 多路复用器耦合到第一和第二延迟线的相应输出,并且选择性地将第一或第二延迟线之一的输出耦合到多路复用器的输出。 控制电路耦合到多路复用器和第一和第二延迟线,并且控制多路复用器,以便使用第一或第二延迟线之一在多路复用器输出端产生延迟信号,并改变另一个延迟系数的延迟因子 通过改变第一或第二延迟线中的另一个的一个或多个延迟元件的电阻和电流来控制第一或第二延迟线。 参考电压源耦合到每个延迟元件,并提供相对于每个延迟元件的电源维持在基本上恒定幅度的参考电压。 延迟信号可以是差分信号。 每个延迟元件可以包括一个或多个可调负载或可调电流源。 可以使用P-FET实现可调负载。 在一个实施例中,第一和第二延迟线的延迟元件中的至少一个包括多个可选择的延迟装置,每个延迟装置与多个可选择的延迟因子之一相关联。
    • 10. 发明授权
    • Automatically ranging phase locked loop circuit for microprocessor clock
generation
    • 自动测距锁相环电路,用于微处理器时钟产生
    • US5903195A
    • 1999-05-11
    • US16848
    • 1998-01-30
    • Eric John LukesJames David StromDana Marie Woeste
    • Eric John LukesJames David StromDana Marie Woeste
    • H03L7/095H03L7/099H03L7/10H03L7/12
    • H03L7/095H03L7/0995H03L7/10Y10S331/02
    • An improved phase locked loop (PLL) circuit is provided for use in microprocessor clock generation. A ring oscillator provides an output frequency signal. A voltage to current converter converts differential control voltages to a variable reference current applied to the ring oscillator. A range control reference current generator applies a range control reference current to the ring oscillator. A range control operatively controls the range control reference current generator to sequentially change the range control reference current applied to the ring oscillator. A lock detector coupled to the range control compares the output frequency signal and a reference frequency signal and responsive to the compares signals applies a locked signal to the range control. Responsive to an applied locked signal, the range control stops changing ranges. The phase locked loop (PLL) circuit automatically sweeps through multiple frequency subranges responsive to the range control. A control signal is applied to the voltage to current converter for selectively controlling an operational mode of the voltage to current converter from a squelched operational mode to an unsquelched operational mode after a set time period. This control signal also is applied to the range control, so that the range control stops changing ranges.
    • 提供改进的锁相环(PLL)电路用于微处理器时钟产生。 环形振荡器提供输出频率信号。 电压 - 电流转换器将差分控制电压转换为施加到环形振荡器的可变参考电流。 范围控制参考电流发生器将范围控制参考电流施加到环形振荡器。 范围控制可操作地控制距离控制参考电流发生器以顺序地改变施加到环形振荡器的范围控制参考电流。 耦合到量程控制的锁定检测器比较输出频率信号和参考频率信号,并且响应于比较信号将锁定信号施加到范围控制。 响应于所施加的锁定信号,范围控制停止变化范围。 锁相环(PLL)电路根据范围控制自动扫描多个频率子范围。 控制信号被施加到电压到电流转换器,用于在设定的时间段之后选择性地将电压/电流转换器的操作模式从压缩操作模式控制到未校准的操作模式。 该控制信号也适用于量程控制,使范围控制停止变化范围。