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:
Nov. 02, 2004
Filed:
Sep. 16, 2003
John Kevin Behel, Greensboro, NC (US);
Frank Murden, Greensboro, NC (US);
Michael Elliott, Summerfield, NC (US);
Joseph Michael Hensley, Kernersville, NC (US);
Analog Devices, Inc., Norwood, MA (US);
Abstract
Digitally-controlled, variable-gain mixers and amplifiers are provided which couple transconductance cells to receive respective tap signals from a fixed attenuator that receives a first input signal. A gain interpolator provides first and second control currents with amplitudes that correspond to a segment of a control word and a multiplexer responds to another control-word segment by routing the control currents to a selected pair of adjacent transconductance cells. In response, the transconductance cells provide amplifier current signals which can also be routed to a transistor switch that mixes them with a second input signal to generate a mixer output signal whose amplitude corresponds to the control word.