Temperature compensation type oscillator
First Claim
1. A temperature compensated oscillator, comprising:
- an oscillation circuit whose oscillation frequency varies with a temperature change;
an output line for outputting a signal based on an oscillation output of said oscillation circuit;
a temperature detection circuit for detecting a temperature state near said oscillation circuit; and
a temperature compensation circuit for keeping a frequency of the signal outputted to said output line substantially constant based on an output from said temperature detection circuit, wherein a selection means is provided which selects whether to enable or disable a temperature compensation function of said temperature compensation circuit.
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Accused Products
Abstract
A temperature compensated oscillator includes an oscillation circuit (20), a temperature detection circuit (18), and a temperature compensation circuit (30) for keeping the frequency of the output signal of the oscillation circuit (20) substantially constant based on the temperature detection signal from the temperature detection circuit, in which a selection circuit (40) is provided which selects to enable or disable a temperature compensation function of the temperature compensation circuit (30). Accordingly, in a state in which a quartz crystal, an IC chip, and so on are mounted in a package, the temperature compensation function of the temperature compensation circuit (30) is disabled, the oscillation circuit (20) is operated to accurately adjust the temperature characteristics of the quartz crystal itself, and thereafter operation of creating compensation data and storing it into a memory can be subsequently performed.
37 Citations
13 Claims
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1. A temperature compensated oscillator, comprising:
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an oscillation circuit whose oscillation frequency varies with a temperature change;
an output line for outputting a signal based on an oscillation output of said oscillation circuit;
a temperature detection circuit for detecting a temperature state near said oscillation circuit; and
a temperature compensation circuit for keeping a frequency of the signal outputted to said output line substantially constant based on an output from said temperature detection circuit, wherein a selection means is provided which selects whether to enable or disable a temperature compensation function of said temperature compensation circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification