Adaptive radio transceiver with low noise amplification

Details Adaptive radio transceiver with low noise amplification Adaptive radio transceiver with low noise amplification

2000-10-18

2002-07-09

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including balanced to unbalanced circuits and vice versa

C330S311000

Reexamination Certificate

active

06417737

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to telecommunication systems, and in particular, to radio transceiver systems and techniques.
BACKGROUND OF THE INVENTION
Transceivers are used in wireless communications to transmit and receive electromagnetic waves in free space. In general, a transceiver comprises three main components: a transmitter, a receiver, and an LO generator or frequency synthesizer. The function of the transmitter is to modulate, upconvert, and amplify signals for transmission into free space. The function of the receiver is to detect signals in the presence of noise and interference, and provide amplification, downconversion and demodulation of the detected the signal such that it can be displayed or used in a data processor. The LO generator provides a reference signal to both the transmitter for upconversion and the receiver for downconversion.
Transceivers have a wide variety of applications ranging from low data rate wireless applications (such as mouse and keyboard) to medium data rate Bluetooth and high data rate wireless LAN 802.11 standards. However, due to the high cost, size and power consumption of currently available transceivers, numerous applications are not being fully commercialized. A simplified architecture would make a transceiver more economically viable for wider applications and integration with other systems. The integration of the transceiver into a single integrated circuit (IC) would be an attractive approach. However, heretofore, the integration of the transceiver into a single IC has been difficult due to process variations and mismatches. Accordingly, there is a need for an innovative transceiver architecture that could be implemented on a single IC, or alternatively, with a minimum number of discrete off-chip components that compensate for process variations and mismatches.
SUMMARY OF THE INVENTION
In one aspect of the present invention, a single ended to differential circuit includes a single ended input adapted for coupling to an antenna, and a converter to convert a single ended signal from the antenna to a differential output signal.
In another aspect of the present invention, a single ended to differential circuit includes receiving means for receiving a single ended signal from an antenna, and converter means for converting the single ended signal to a differential output signal.
In yet another aspect of the present invention, a method for converting a single ended signal to a differential signal includes receiving the single ended signal from an antenna, and converting the single ended signal to the differential signal.
It is understood that other embodiments of the present invention will become readily apparent to those skilled in the art from the following detailed description, wherein it is shown and described only embodiments of the invention by way of illustration of the best modes contemplated for carrying out the invention. As will be realized, the invention is capable of other and different embodiments and its several details are capable of modification in various other respects, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and detailed description are to be regarded as illustrative in nature and not as restrictive.


REFERENCES:
patent: 5404050 (1995-04-01), Nauta
patent: 5945878 (1999-08-01), Westwick et al.
Roufougaran, A. et al., “A 1 GHz CMOS RF Front-End IC for a Direct-Conversion Wireless Receiver,” IEEE Journal of Solid-State Circuits, Jul. 1996, 10 pages, vol. 31, No. 7, IEEE.
Rofougaran, A. et al., “A 1 GHz CMOS RF Front-End IC With Wide Dynamic Range,” Integrated Circuits & Systems Laboratory Electrical Engineering Department University of California, Los Angeles, CA.; European Solid-State Conf., Lille, France, Sep. 1995, pp. 250-253 of the conference proceedings.
Rofougaran, Ahmadreza, “A Single-Chip Spread-Spectrum Wireless Transceiver in CMOS,” Final Report, Integrated Circuits & Systems Laboratory Electrical Engineering Department, University of California, Los Angeles, CA, 1999, 339 pages, Feb. 19, 2002.

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