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. 25, 2011
Filed:
Jan. 29, 2008
Daniel L. Kaczman, Gurnee, IL (US);
Mohammed S. Alam, Grayslake, IL (US);
David L. Cashen, Wauconda, IL (US);
LU M. Han, Chicago, IL (US);
Mohammed Rachedine, Lincolnshire, IL (US);
Manish N. Shah, Vernon Hills, IL (US);
Daniel L. Kaczman, Gurnee, IL (US);
Mohammed S. Alam, Grayslake, IL (US);
David L. Cashen, Wauconda, IL (US);
Lu M. Han, Chicago, IL (US);
Mohammed Rachedine, Lincolnshire, IL (US);
Manish N. Shah, Vernon Hills, IL (US);
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A high performance radio frequency receiver includes a low noise amplifier with large binary and stepped gain control range, controlled impedance, and enhanced blocker immunity, for amplifying and converting a radio frequency signal to a current; a pulse generator for generating in-phase and quadrature pulses; a crossover correction circuit and pulse shaper for controlling a crossover threshold of the pulses and interaction between in-phase and quadrature mixers; and a double balanced mixer for combining the RF signal with the pulses to generate an intermediate frequency or baseband zero intermediate frequency current-mode signal. The in-phase and quadrature pulses have a duty cycle of 20-35%. The intermediate frequency signal and second order harmonics may be filtered with a high frequency low pass filter and a current injected complex direct-coupled filter. Decreased die size, current drain, cost, and complexity, as well as improvements in gain, 1/f noise, noise figure, sensitivity, and linearity may result.