A WIRELESS TRANSMITTER, A CIRCUIT, AND METHOD FOR DRIVER HARMONIC REDUCTION

• Main Author: Arnold, Siegfried Hermann
• Format: Patent
• Language: English; French; German
• Published: 27.06.2018
• Subjects: AMPLIFIERS; BASIC ELECTRONIC CIRCUITRY; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION

A wireless transmitter (200) includes: a digital signal generator (214) arranged to generate a digital signal for transmission (222); a digital-to-analog converter (262) arranged to convert the digital signal for transmission into analog form; and a non-ideal amplifier (264) arranged to amplify the analog signal for transmission. At least one harmonic reduction signal generator (218) is arranged to generate at least one digital harmonic reduction signal; and a summing junction (230) is arranged to add the digital signal for transmission (222) with the at least one harmonic reduction signal (220, 221) to form a combined signal, wherein the non-ideal amplifier amplifies the combined signal to form an analog output signal. An analog to digital converter (266) is arranged to convert the analog output signal (270) into a digital representation of the analog output signal (268). A controller (250) is coupled to the digital signal generator (214) and the at least one harmonic reduction signal generator (218) and arranged to: analyse the digital representation of the analog output signal to determine a harmonic content of the analog output signal; and cause the harmonic reduction signal generator (211, 213) to generate the at least one digital harmonic reduction signal (220, 221) such that it reduces at least one harmonic of the amplified analog signal for transmission output from the non-ideal amplifier (264).