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:
Sep. 12, 1995
Filed:
Jun. 08, 1994
Brian K Good, Greentown, IN (US);
Seyed R Zarabadi, Kokomo, IN (US);
Delco Electronics Corporation, Kokomo, IN (US);
Abstract
A crystal oscillator circuit that provides a low distortion clocking signal. The oscillator circuit incorporates an inverter circuit in combination with a diode connected transmission gate circuit. The transmission gate circuit includes two MOSFETs connected between input and output nodes of the inverter circuit. When the current at the input node goes high and the current at the output node goes low, one of the two transmission gate circuit MOSFETs will begin conducting such that current at the input node will be transferred to the output node, thus decreasing the voltage difference between the two nodes. Likewise, when the current at the output node goes high and the current at the input node goes low, the other MOSFET of the transmission gate circuit will begin to conduct such that current is transferred from the output node to the input node, again reducing the voltage difference between the input and output node. Additionally, the transmission gate circuit provides the impedance necessary to generate oscillation of the oscillator circuit at start-up to regulate the output voltage swing of the oscillator circuit.