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    • 3. 发明授权
    • Delay line loop for on-chip clock synthesis with zero skew and 50% duty
cycle
    • 延迟线路环路,用于零偏移和50%占空比的片上时钟合成
    • US5410263A
    • 1995-04-25
    • US023673
    • 1993-02-26
    • Alexander Waizman
    • Alexander Waizman
    • H03K5/00H03K5/13H03K5/135H03L7/081H04L7/033H03K5/04
    • H03L7/0812H03K5/133H03K5/135H03K2005/00104H03K2005/00195H04L7/033
    • In an integrated circuit for synthesizing a 50% duty cycle internal clock, the internal clock is synchronized with zero phase difference with respect to an external reference clock having a frequency that is equal to, or is a submultiple of, the synthesized internal clock. The duty cycle of the synthesized waveform is fixed and invariant with respect to the reference clock duty cycle. Synchronization of the two clocks is achieved by a delay-line-loop using a voltage controlled delay line with a nominal half period delay of the synthesized clock. The 50% duty cycle is achieved by a second control loop that has as its input both the reference and the inverted synthesized clock. This second loop drives the voltage controlled delay line with the synthesized internal clock signal. The integrated circuit clock synthesizer is intended to operate as an integral part of a microprocessor or a peripheral unit operating in a system having a common external reference clock.
    • 在用于合成50%占空比内部时钟的集成电路中,内部时钟与零相位差相对于具有等于或者是合成内部时钟的倍数的外部参考时钟同步。 合成波形的占空比相对于参考时钟占空比是固定的和不变的。 通过使用具有合成时钟的标称半周期延迟的电压控制延迟线的延迟线路环来实现两个时钟的同步。 通过第二个控制回路实现50%占空比,其具有参考和反相合成时钟的输入。 该第二回路利用合成的内部时钟信号驱动电压控制的延迟线。 集成电路时钟合成器旨在作为在具有公共外部参考时钟的系统中操作的微处理器或外围单元的组成部分。