Abstract: An amplifier circuit includes a transconductance amplifier at an input side of the amplifier circuit, a transimpedance amplifier connected to an output of the transconductance amplifier, and a voltage amplifier connected to an output of the transimpedance amplifier. The transconductance amplifier and the transimpedance amplifier form a low-impedance node at an interface thereof. A feedback circuit is connected between an output of the voltage amplifier and the low-impedance node between the transconductance amplifier and the transimpedance amplifier. The transconductance amplifier, the transimpedance amplifier, and the voltage amplifier form a main amplifier stage. The feedback circuit senses an imbalance in an output of the main amplifier stage, whereby a correction signal is integrated and negatively fed back to the low-impedance node between the transconductance amplifier and the transimpedance amplifier.
Type:
Application
Filed:
January 16, 2009
Publication date:
July 22, 2010
Applicant:
UNIVERSITY OF MACAU
Inventors:
Pui-In Mak, Seng-Pan U., Rui P. Martins
Abstract: A reconfigurable receiver is disclosed, operating in accordance with a two-step channel selection. The first step provides for a coarse radio frequency (RF) channel selection, to downconvert a desired channel and an image channel of the desired channel to IF. The second step provides for a fine intermediate frequency (IF) channel selection to select either the desired channel or the image channel. The receiver can be used in a transceiver.
Type:
Grant
Filed:
August 26, 2005
Date of Patent:
May 5, 2009
Assignee:
University of Macau
Inventors:
Pui-In Mak, Seng-Pan U, Rui-Paulo da Silva Martins
Abstract: A reconfigurable multimode transmitter is disclosed, operating in accordance with a two-step channel selection. The first step provides for a fine channel selection and upconversion of a desired channel to either positive or negative IF. The second step is a coarse channel selection and upconversion of a desired channel to the RF. The receiver and transmitter can be used in a transceiver.
Type:
Application
Filed:
September 3, 2008
Publication date:
December 25, 2008
Applicant:
UNIVERSITY OF MACAU
Inventors:
Pui-In MAK, Seng-Pan U, Rui Paulo da Silva MARTINS