An oscillator includes a front side voltage divider, a rear side voltage divider, and an oscillation unit. The front side voltage divider includes a first resistor connected between a first and second potential sources, and a first output terminal configured to changeably connect to a connection position in the first resistor so as to vary an obtained output voltage. The rear side voltage divider includes a second resistor connected between the first output terminal and a third potential source; and a second output terminal configured to changeably connect to a connection position in the second resistor so as to vary an obtained output voltage. The oscillation unit includes a variable capacitance element with a capacitance varied according to the output voltage from the second output terminal. The oscillation unit varies an output frequency based on a variation in a resonance point associated with a variation in the capacitance.

An automatic calibration of a clock of a wireless portable part with respect to a clock of a fixed part in a field environment. The calibration performed in the field environment negates the need to calibrate the clock during manufacture and negates the need for an initial field recalibration because of temperature differences between manufacture and the field. In performing the calibration the frequency of the clock of the portable part is varied until the portable part is synchronous with the fixed part to with in a range of timing bits. The portable part is declared calibrated after remaining calibrated for a defined number of data frames.

An oscillation circuit includes an oscillating circuit adapted to oscillate a resonator element having a frequency-temperature characteristic, and a frequency adjustment circuit having a capacitance circuit connected to the oscillating circuit and adapted to adjust an oscillation frequency of the oscillating circuit, and a logic circuit, to which a signal having been output from the oscillating circuit is input, and which adjusts a frequency of the signal, and the frequency adjustment circuit compensates the frequency-temperature characteristic using at least the capacitance circuit in a predetermined temperature range, and compensates the frequency-temperature characteristic using the logic circuit alone outside the predetermined temperature range.

An electronic device includes a drive section, a detection signal output section adapted to generate a first analog signal having a value varying in accordance with a physical quantity, and a control section adapted to generate a second analog signal controlled based on the first analog signal, and adapted to control a drive state of the drive section, at least the detection signal output section and the control section are provided to a substrate, and a first digital signal obtained by digitalizing the first analog signal and a second digital signal obtained by digitalizing the second analog signal can be output from the substrate.

An oscillator includes a front side voltage divider, a rear side voltage divider, and an oscillation unit. The front side voltage divider includes a first resistor connected between a first and second potential sources, and a first output terminal configured to changeably connect to a connection position in the first resistor so as to vary an obtained output voltage. The rear side voltage divider includes a second resistor connected between the first output terminal and a third potential source; and a second output terminal configured to changeably connect to a connection position in the second resistor so as to vary an obtained output voltage. The oscillation unit includes a variable capacitance element with a capacitance varied according to the output voltage from the second output terminal. The oscillation unit varies an output frequency based on a variation in a resonance point associated with a variation in the capacitance.