Title:
【発明の名称】デジタル位相検出器
Document Type and Number:
Japanese Patent JPH09507103
Kind Code:
A
Abstract:
PCT No. PCT/DE94/01380 Sec. 371 Date Jun. 3, 1996 Sec. 102(e) Date Jun. 3, 1996 PCT Filed Nov. 23, 1994 PCT Pub. No. WO95/18384 PCT Pub. Date Jul. 6, 1995The digital phase detector detects a phase shift between a comparison clock pulse signal (VT) and a reference clock pulse signal (RT). It includes logic gates (STO,STA) for generating start and stop pulses from respective successive pulses of the comparison and reference clock pulse signals (RT,VT). A counter (ZG,Z) counts the pulses of a counter clock pulse signal (ZT) of a higher frequency in a time window between the start signal and the subsequent stop signal. The counter value of the counter is a measure of the phase shift between the comparison and reference clock pulse signals (VT,RT). Quantization errors in the phase shift signal are considerably reduced by providing a logical gate (VZ) for determining the sign of the phase shift and a device ( mu P) for adding a constant, advantageously 0.5, to the counter value. The phase detector of the invention makes possible phase control loops providing precise pulse tracking, since it makes available a regulating signal, even with the smallest phase shifts between the comparison and reference clock pulse signals.
Inventors:
Wolfgang Mellar
Fritz Wittmann
Fritz Wittmann
Application Number:
JP51771395A
Publication Date:
July 15, 1997
Filing Date:
November 23, 1994
Export Citation:
Assignee:
ROBERT BOSCH GMBH
International Classes:
G01R25/04; G01R25/08; H03K5/26; H03L7/085; (IPC1-7): G01R25/08; H03K5/26; H03L7/085
Attorney, Agent or Firm:
Toshio Yano (3 outside)