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. 31, 2000
Filed:
Mar. 09, 1999
Omid Shoaei, Allentown, PA (US);
Zhi-Long Tang, Allentown, PA (US);
Lucent Technologies, Inc., Murray Hill, NJ (US);
Abstract
A method and apparatus for adjusting the resistance across a slave transistor to follow a master resistor network are disclosed. A tuning circuit is disclosed which is used to control the effective resistance of a slave transistor for use in high speed integrated automatic gain control, equalizer, filter or equivalent types of circuits where low parasitic capacitance is desired. The invention provides a way to replace a resistor network and its associated high parasitic capacitance with an equivalent resistance having low parasitic capacitance. The invention replaces the resistor network, having large parasitic capacitance, with a slave transistor exhibiting an equivalent resistance, having low parasitic capacitance. An automatic tuning circuit containing a resistor network is located remotely to a circuit containing a slave transistor. The tuning circuit is then used to adjust the effective resistance of the slave transistor. The invention decreases unwanted parasitic capacitance, resulting in higher speed integrated automatic gain control, equalizer, filter and equivalent types of circuits.