The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 13, 2001
Filed:
Sep. 16, 1996
Masanori Miyagi, Chiba, JP;
Yoshikazu Kojima, Chiba, JP;
Seiko Instruments Inc., , JP;
Abstract
An low-power consumption integrated ring oscillator capable of stable operation throughout a wide voltage range without undergoing a large frequency change includes a first constant voltage generating circuit having an enhancement mode P-MOS transistor and a depletion mode N-MOS transistor and a second constant voltage generating circuit having a depletion mode N-MOS transistor and an enhancement mode N-MOS transistor. A first constant voltage generated by the first constant voltage circuit is applied to a gate electrode of a P-MOS transistor of transmission gates connected between respective cascaded inverters of the ring oscillator. A second constant voltage generated by the second constant voltage generating circuit is connected to the gate electrode of an N-MOS transistor of the transmission gates. By this construction, current consumption is reduced and battery lifetime can be increased. The boosting circuit for writing and erasing an EEPROM circuit may be formed with the low power ring oscillator.