Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By phase
Reexamination Certificate
2005-05-03
2005-05-03
Nguyen, Linh M. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By phase
C327S002000
Reexamination Certificate
active
06888379
ABSTRACT:
A phase detector circuit that prevents a significant loss of lock during input of CIDs (Consecutive Identical Digits) and has a high linearity of a phase to voltage conversion characteristic around a phase-locked point in an operation of comparing phases of random NRZ signals in a phase. By using the phase detector circuit having a circuit configuration containing a delay circuit and a combination of leapt a multiplier circuit and a subtractor circuit, a capability as the PLL circuit of preventing the significant loss of lock can be realized. In addition, since a duty cycle of a pulse appearing at an output terminal3of a multiplier circuit62approaches 50% as a phase-locked state is approached, a distortion in the phase to voltage conversion characteristic does not appear, and thus high linearity of the phase to voltage conversion characteristic around thus phase-locked point can be realized.
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Akazawa Yukio
Hirose Masaki
Takeo Yasuhiko
Tobayashi Masatoshi
Nguyen Linh M.
NTT Electronics Corporation
Rothwell Figg Ernst & Manbeck
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