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:
Dec. 02, 2003
Filed:
Sep. 28, 2001
Gerald J. Twomey, Escondido, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
To provide a mixer/amplifier capable of providing variable gain while maintaining a substantially constant common mode operating voltage level and to maintain a substantially constant operating voltage in new, low voltage designs and to provide a mixer/amplifier in low-power direct conversion receiver. A low noise amplifier is provided in which a gain control signal is provided through a differential current source. Two output currents I and I are provided. I +I =a constant. I and I are mirrored in first and second paths, one including amplifier transistors and optionally a Gilbert cell multiplier. Irrespective of amplifier gain, the current through the two paths remains equal to I and I , and common mode voltage remains constant.