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    • 9. 发明授权
    • Digital phase meter apparatus
    • 数字式相位计仪表
    • US4654586A
    • 1987-03-31
    • US742826
    • 1985-06-10
    • Joseph T. Evans, Jr.Stacy M. MunechikaMichael C. NorrisAlisa M. HrenKevin M. HeckSuzanne M. Zulka
    • Joseph T. Evans, Jr.Stacy M. MunechikaMichael C. NorrisAlisa M. HrenKevin M. HeckSuzanne M. Zulka
    • G01R25/08
    • G01R25/08
    • A digital phase meter to measure the phase difference between an input signal and a reference signal and output this phase information in the form of an eight bit number. The input signal and the reference signal, which are sinusoidal, are conditioned to a more defined leading edge by a high speed differential voltage comparator and a dual/differential line receiver. A series of uniquely configured D flip-flops are used to detect the leading edge of both the signal input and the reference input. An AND gate then acts as a switch that is activated on the leading edge of the signal input. The time interval between the two positive leading edges of the input signal and reference signal specifies the phase difference. The AND gate is in the high state for this duration. The phase difference is converted into an 8-bit binary number via two 4-bit cascaded counters. The high output of the AND gate is used to enable the counters for the duration of the phase difference.
    • 数字相位计,用于测量输入信号和参考信号之间的相位差,并以8位数字的形式输出该相位信息。 正弦曲线的输入信号和参考信号由高速差分电压比较器和双路/差分线路接收器调节到更确定的前沿。 一系列独特配置的D触发器用于检测信号输入和参考输入的前沿。 然后,与门作为在信号输入的前沿被激活的开关。 输入信号和参考信号的两个正前沿之间的时间间隔指定相位差。 在这个持续时间内,与门处于高电平状态。 通过两个4位级联计数器将相位差转换为8位二进制数。 与门的高输出用于在相位差的持续时间内使能计数器。