Patent ID: 6617937
Filing Date: 2003-09-09
Classification: H04B

Abstract:
An integrated circuit with infrared transmission function comprising:a frequency prescaler for receiving an oscillation frequency and dividing said oscillation frequency to produce a carrier for infrared transmission; a duty cycle selector for receiving said carrier produced by said frequency prescaler and adjusting a duty depending on a desired duty cycle to produce a carrier of a duty cycle for infrared transmission; a pulse generator for receiving low time and high time values from an external control register through an input terminal; a hardware modulator for respectively receiving said carrier of said duty cycle from said duty cycle selector and an output signal from said pulse generator and generating a signal of a desired waveform for infrared transmission after a logic operation thereof; a multiplexer for respectively receiving said signal of said desired waveform from said hardware modulator and a data output signal and producing a selected output signal under control of a select control signal; and an output buffer connected to an output terminal of said multiplexer for transferring data to an output terminal of said integrated circuit.