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:
Oct. 13, 1992
Filed:
Feb. 12, 1991
Tamas S Szepesi, San Jose, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A biasing circuit and method of producing a biasing voltage particularly suitable for integrated circuits combining MOS and bipolar technology. The circuit includes an NMOS transistor which produces a gate-source reference voltage when drain current is supplied to the transistor. The reference gate-source voltage is coupled to the output of the circuit at a reduced impedance level so as to increase noise immunity. The coupling circuit preferably includes two NPN bipolar transistors. The NPN transistors add and subtract identical base-emitter junction voltages to the reference voltage so that the magnitude of the reference voltage is unchanged. An NMOS transistor, having a gate-source voltage equal to the reference voltage, is also connected to the output for reducing the output impedance of the circuit.