Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1987-03-25
1988-12-06
Richardson, Robert L.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
358330, 357 28, 357 41, 307310, 307450, 307451, 307579, 329110, H03K 714, G11B 700
Patent
active
047899760
ABSTRACT:
A circuit for compensating change in delay time of a delay circuit due to variation in temperature employs, as a phase shifter of a pulse FM detection circuit, a delay circuit whose delay time is subject to change due to variation in temperature and can be controlled in response to a control signal. A dc component in an output of this pulse FM detection circuit is compared with a preset reference value and a resulting comparison output is used for controlling the delay time of the delay circuit and thereby compensating the temperature characteristic of the delay time. In a device using plural delay circuits, these delay circuits can be disposed on the same substrate and the delay times of these delay circuits can be controlled by the same comparison output. Since a signal which is handled by a delay circuit is utilized for the temperature compensation, an accurate temperature compensation can be realized with a simple circuit construction.
REFERENCES:
patent: 4614912 (1986-09-01), Moberg
patent: 4717836 (1988-01-01), Doyle
Nippon Gakki Seizo Kabushiki Kaisha
Richardson Robert L.
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