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:
Mar. 02, 1993
Filed:
Mar. 17, 1992
Ping Wang, Saratoga, CA (US);
Silicon Storage Technology, Inc., Sunnyvale, CA (US);
Abstract
A charge pump has a chain of diode connected MOS transistors to generate a high voltage output. Each of the serially connected MOS transistors has a capacitor with one end connected to the input of one of the transistors. A ring oscillating circuit receives an enable signal and generates a plurality of oscillating signals. Each oscillating signal has the same frequency and is supplied to the second end of a capacitor. Between each capacitor the ring oscillating circuit has an inverter which inverts the supplied oscillating signal. Thus, immediately adjacent capacitors are provided with an inverse oscillating signal. In this manner, the charge pump can be operated at a high frequency, drawing smoother current from the power supply, with greater capacitive loading distributed unto each stage of the oscillator. Finally, breakdown prevention needs only applied to the anode of the last diode.