Patent Number: 6,166,609

Title: Oscillator circuit supplied with optimal power voltage according to oscillator output

Abstract: A crystal oscillation circuit that is capable of operating stably with a low power consumption includes a signal inversion amplifier and a power control circuit that controls the power voltage of this signal inversion amplifier in accordance with an oscillation output. The power control circuit includes a power voltage generation circuit that outputs a plurality of power voltages of different values; a determination control portion that determines the optimal value of the power voltage to be applied to the signal inversion amplifier, based on the oscillation output; and a multiplexer that controls the switching of the power voltage applied to the signal inversion amplifier from the power voltage generation circuit, based on the result of that determination.

Inventors: Nakamiya; Shinji (Suwa, JP), Kadowaki; Tadao (Suwa, JP), Makiuchi; Yoshiki (Suwa, JP)

Assignee: Seiko Epson Corporation

International Classification: G04F 5/00 (20060101); G04F 5/06 (20060101); H03B 5/36 (20060101); H03B 005/36 (); H03L 005/00 ()

Expiration Date: 12/26/2017