OSCILLATOR, ELECTRONIC APPARATUS, AND MOVING OBJECT

摘要

An oscillator includes an oscillation element, an oscillation circuit, a heat generation element, a temperature control circuit, and a temperature correction signal generation circuit adapted to generate a temperature correction signal used to correct a frequency-temperature characteristic. The temperature correction signal generation circuit includes a temperature sensor, a first-order correction signal generation circuit adapted to generate a first-order correction signal, and a high-order correction signal generation circuit adapted to generate a high-order correction signal. The high-order correction signal generation circuit includes a high-temperature side second-order correction signal generation circuit, a high-temperature side polarity switching circuit adapted to switch a polarity of a high-temperature side second-order correction signal, a low-temperature side second-order correction signal generation circuit, and a low-temperature side polarity switching circuit adapted to switch a polarity of a low-temperature side second-order correction signal.

主权项

1. An oscillator comprising:
an oscillation element; an oscillation circuit adapted to oscillate the oscillation element; a heat generation element adapted to heat the oscillation element; a temperature control circuit adapted to control the heat generation element; and a temperature correction signal generation circuit adapted to generate a temperature correction signal used to correct a frequency-temperature characteristic of an output signal of the oscillation circuit, wherein the temperature correction signal generation circuit includes
a temperature sensor,a first-order correction signal generation circuit adapted to generate a first-order correction signal used to perform a first-order correction, anda high-order correction signal generation circuit adapted to generate a high-order correction signal used to perform a high-order correction, and the high-order correction signal generation circuit includes
a high-temperature side second-order correction signal generation circuit adapted to generate a high-temperature side second-order correction signal used to perform a second-order correction on a high-temperature side higher than temperature in linear region of the frequency-temperature characteristic,a high-temperature side polarity switching circuit adapted to switch a polarity of the high-temperature side second-order correction signal,a low-temperature side second-order correction signal generation circuit adapted to generate a low-temperature side second-order correction signal used to perform the second-order correction on a low-temperature side lower than temperature in the linear region, anda low-temperature side polarity switching circuit adapted to switch a polarity of the low-temperature side second-order correction signal.