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. 12, 2002
Filed:
Nov. 13, 1998
Winbond Electronics Corp., Hsinchu, TW;
Abstract
A GFSK (Gaussian Frequency Shift Keying) radio transceiver is provided for ISM (Industrial Scientific and Medical) wideband communication. The GFSK radio transceiver includes a transmitter for modulating transmitted signal into RF signal, and a receiver for demodulating received signal into digital form. The transmitter includes a VCO for generating an oscillating signal serving as a carrier signal in the transmitter and a first local oscillating signal in the transmitter; and a variable-gain power amplifier, capable of being adjustable between two gain values, for amplifying the RF signal. The receiver includes a mixer for downconverting the received signal into a first IF signal by using the first local oscillating signal from the transmitter; and an IF demodulator for downconverting the first IF signal into a second IF signal by using a locally generated second local oscillating signal. The GFSK radio transceiver can operate either in half-duplex mode or full-duplex mode in a time-division duplex (TDD) system through micro-processor controls. Further, it utilizes a variable-gain power amplifier that can improve the drawbacks of interference and high power consumption with the prior art, and further utilizes a single wideband VCO to generate an oscillating signal that can be used both as the carrier signal in the transmitter and the first local oscillating signal for the receiver. This allows the GFSK radio transceiver to be implemented with a fewer number of VCOs as compared to the prior art, thus reducing the manufacturing cost.