Patent Number: 6,490,440

Title: Digital transmitter circuit and method of operation

Abstract: A transceiver (10) includes a transmitter (16) that receives a digital datastream from a digital signal processor (18) to delay lines (20, 30). Thedelay lines (20, 30) provide an address to a ROM look-up table (40).Another input of the look-up table (40) receives a signal that selectsprotocols such as TDMA, CDMA, and GSM. A multi-accumulator fractional-Nsynthesizer (48) receives phase derivative coefficients and a DAC (46)receives amplitude modulation coefficients from the look-up table (40)based on the selected protocol. The analog output signals from the DAC(46) and the synthesizer (48) are received by a variable gain amplifier(54) that generates an RF amplitude and frequency modulated output signalfor transmission from the transmitter (16).

Inventors: Mielke; James S. (Phoenix, AZ), Higashi; Albert H. (Lawrenceville, GA), Drogi; Serge (Phoenix, AZ)


International Classification: H04B 1/40 (20060101); H04B 1/04 (20060101); H04B 001/02 ()

Expiration Date: 12/02015