Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison
Patent
1989-06-28
1990-10-16
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Phase comparison
G01R 2500
Patent
active
049638173
ABSTRACT:
In an apparatus for detecting a phase difference between two digital signals including an n stage delay circuit, an n bit register connected to the n stage delay circuit, a signal encoding means connected to the n bit register, and a compensation circuit connected to the encoder, a test signal is applied to the delay circuit first and two different delayed data are obtained by applying a reference signal to the n bit register twice, the delay characteristics of the delay circuit is calculated by using two different data and the period time of the two reference signals, then a signal to be subjected to phase difference detection is applied to the delay circuit to obtain delayed data by applying a reference signal to the n bit register, the delayed data is compensated at the compensating circuit by using the delay characteristics of the delay circuit. Thus, an accurate phase difference between two digital signals is obtained.
REFERENCES:
patent: 4075698 (1978-02-01), Lode
patent: 4457005 (1984-06-01), Burke et al.
patent: 4652838 (1987-03-01), Nossen
patent: 4700241 (1987-10-01), Yasuda et al.
Kohiyama Kiyoshi
Takahashi Hidenaga
Fujitsu Limited
Tokar Michael J.
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