Circuit device and oscillator
A circuit device and circuit technology, applied in power oscillators, measuring devices, instruments, etc., can solve problems such as reduced memory usage efficiency and reduced temperature compensation accuracy
Pending Publication Date: 2022-04-12
SEIKO EPSON CORP
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Problems solved by technology
Therefore, there is a problem that the use efficiency of the memory decreases in the temperature range where the temperature sensitivity is small, and on the other hand, the accuracy of temperature compensation decreases in the temperature range where the temperature sensitivity is large.
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[0019] Next, a preferred embodiment of the present invention will be described in detail. Further, the present embodiment described below is not unworthy to limit the contents described in the claims, and the entire structure described in the present embodiment is not necessarily a must-have a structural element.
[0020] Circuit device and oscillator
[0021] figure 1 The relationship between the temperature characteristics of the oscillation frequency and the address assignment of the oscillation frequency when the temperature data output directly using the temperature sensor is used as the address of the lookup table. Here, the temperature data is shown to be linear with respect to the temperature, but the temperature data is substantially linear relative to the temperature. Further, the temperature characteristics of the oscillation frequency are shown relative to the temperature of 2 times, but as long as the temperature sensitivity of the oscillation frequency varies depend...
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A circuit arrangement and an oscillator. A memory can be efficiently utilized and high-precision temperature compensation can be realized. The circuit device includes an oscillation circuit that generates an oscillation signal using an oscillator, a frequency adjustment circuit that adjusts an oscillation frequency of the oscillation circuit on the basis of frequency adjustment data, a temperature sensor circuit that outputs temperature data, an arithmetic circuit, and a storage circuit. The arithmetic circuit outputs the converted temperature data by performing conversion processing such that the slope of the converted temperature data with respect to the temperature data in the first temperature range is different from the slope of the converted temperature data with respect to the temperature data in the second temperature range with respect to the temperature data on the temperature data. The storage circuit stores a lookup table representing a correspondence relationship between the conversion temperature data and the frequency adjustment data.
Description
Technical field [0001] The present invention relates to a circuit device and an oscillator or the like. Background technique [0002] Patent Document 1 discloses a temperature compensation oscillating circuit, which comprises: a temperature measuring unit, which outputs a temperature measurement result in the form of a digital signal; counter, its output of the digital signal is used as the address value; The storage unit outputs a correction value corresponding to the address value; and a capacitor array, which is set to adjust the oscillation frequency with the capacitance value corresponding to the correction value. [0003] Patent Document 1: Japanese Laid-Open No. 2007-67675 [0004] In Patent Document 1, a bit of the high position of the digital signal is used as the address value, and therefore, the address value corresponds to a temperature spacing of a substantially fixed temperature interval. That is, the correction value corresponding to the temperature point of the su...
Claims
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IPC IPC(8): H03B5/04H03B5/32G01K13/00
CPCH03B5/04H03B5/326H03B2200/005H03B5/366
Inventor 羽田秀生鸟海裕一樋口哲平
Owner SEIKO EPSON CORP