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:
Feb. 17, 2009
Filed:
Jul. 07, 2005
Aly M. Ismail, Newport Beach, CA (US);
Geoffrey Hatcher, Costa Mesa, CA (US);
Edward Youssoufian, Irvine, CA (US);
Dave Yates, San Clemente, CA (US);
Aly M. Ismail, Newport Beach, CA (US);
Geoffrey Hatcher, Costa Mesa, CA (US);
Edward Youssoufian, Irvine, CA (US);
Dave Yates, San Clemente, CA (US);
Skyworks Solutions, Inc., Woburn, MA (US);
Abstract
A mixer is disclosed having an output stage with an amplifier or gain device configured in a feedback loop to maintain a virtual ground at the input to the gain device. The gain device provides significant dynamic range, gain, and the appropriate impedance matching to insure a low noise output signal of a desired magnitude. Use of an amplifying output stage removes the dependence between mixer gain and mixer configuration, such as mixer bias resistor value, while concurrently overcome undesirable flicker noise that results from use of active devices in the mixer bias structure. A stable virtual ground at the mixer output and gain device input provides linearity over frequency. The gain device may comprises an operational amplifier or trans-resistance/trans-conductance device.