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    • 4. 发明授权
    • Phase frequency detecting circuit
    • 相位频率检测电路
    • US5739709A
    • 1998-04-14
    • US721053
    • 1996-09-26
    • Noriyuki Banno
    • Noriyuki Banno
    • H03L7/085G01R23/06H03D3/02H03D13/00H03L7/087H04L27/227
    • H03D13/003H03L7/087
    • A phase frequency detecting circuit is designed to produce an output voltage which varies with respect to an input phase difference between a base phase and a reference phase. Herein, a first phase frequency comparator produces a first phase error signal which is proportional to the input phase difference. A first integration circuit performs integration on the first phase error signal to produce a control voltage. Next, a second phase frequency comparator receives a frequency-divided base phase and a frequency-divided reference phase to produce a second phase error signal. A second integration circuit performs integration on the second phase error signal to produce a frequency-divided control voltage. An offset voltage creating circuit creates an offset voltage. Herein, the offset voltage is created based on the frequency-divided control voltage; and a sign thereof is determined responsive to a relationship between the control voltage and frequency-divided control voltage. An offset imparting circuit adds the offset voltage to the frequency-divided control voltage, then, the addition result is amplified to produce the output voltage. Incidentally, an amplifier can be further provided to produce an amplified output voltage based on the frequency-divided control voltage. The amplified output voltage is used instead of the frequency-divided control voltage and is delivered to the offset voltage creating circuit and offset imparting circuit.
    • 相位频率检测电路被设计成产生相对于基相和基准相位之间的输入相位差而变化的输出电压。 这里,第一相位频率比较器产生与输入相位差成比例的第一相位误差信号。 第一积分电路对第一相位误差信号进行积分以产生控制电压。 接下来,第二相位频率比较器接收分频基极相位和分频基准相位以产生第二相位误差信号。 第二积分电路对第二相位误差信号进行积分以产生分频控制电压。 偏移电压产生电路产生偏移电压。 这里,基于分频控制电压产生偏移电压; 并且响应于控制电压和分频控制电压之间的关系来确定其符号。 偏移赋予电路将偏移电压加到分频控制电压上,然后相加结果被放大以产生输出电压。 顺便提及,可以进一步提供放大器以根据分频控制电压产生放大的输出电压。 使用放大的输出电压而不是分频控制电压,并且将其输送到偏移电压产生电路和偏移赋予电路。