Disable circuit for a phase locked loop discriminator circuit
- 申请公布号：
- US4605908(A)
- 申请号：
- US19850812555
- 申请日期：
- 1985.12.23
- 申请公布日期：
- 1986.08.12
- 申请人：
- MOTOROLA, INC.
- 发明人：
- BROUGHTON, CHRISTOPHER D.
- 分类号：
- H03L7/113;(IPC1-7):H03L7/06
- 主分类号：
- H03L7/113
- 摘要：
- The present invention consists of an apparatus comprising a phase locked loop and a frequency loop having a discriminator and a disable. The disable is used to electrically disconnect the frequency loop from the phase locked loop when the phase of the output from the voltage controlled oscillator is within a preset range of the incoming signal. The disable acts to provide an adjusting voltage signal, set by the discriminator, to the phase locked loop when the output and input signal phases are out of the preset range. When they are within the preset range the disable outputs a zero voltage regardless of the input from the discriminator.
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