초록 ▼

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 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.

대표청구항 ▼

A temperature compensation circuit for a delay circuit comprising: a delay circuit which is used as a phase-shifter in a pulse FM detection circuit and whose delay time changes depending upon temperature and can be controlled in response to a control signal; a dc component detection circuit for dete

A temperature compensation circuit for a delay circuit comprising: a delay circuit which is used as a phase-shifter in a pulse FM detection circuit and whose delay time changes depending upon temperature and can be controlled in response to a control signal; a dc component detection circuit for detecting a dc component in an output of said pulse FM detection circuit; and comparison control means for comparing the dc component detected by said dc component detection circuit with a predetermined reference value for controlling delay time of said delay circuit with a comparison output of the comparison control means and thereby compensating a temperature characteristic of the delay time of said delay circuit.