Matching network for transmission circuitry

Abstract

The present disclosure relates to transmission circuitry of a wireless communication device. The transmission circuitry includes power amplifier circuitry, an output matching network, and impedance control circuitry. The power amplifier circuitry amplifies a radio frequency (RF) input signal to provide an amplified RF output signal, which is passed through the output matching network and transmitted via one or more antennas. As the center frequency of the RF input signal and conditions of operating parameters change, the impedance control circuitry adjusts the values of one or more variable impedance elements of the output matching network in a desired fashion. The values of the variable impedance elements are adjusted such that the output matching network concurrently and dynamically presents the desired load impedances at the center frequency and at one or more harmonics of the RF input signal to achieve a given performance specification.

Description

[0001] This application claims priority to US Patent Application Serial No. 12 / 917,112, filed November 1, 2010, the entire contents of which are hereby incorporated by reference. technical field [0002] The present disclosure relates to wireless communications, and in particular, to dynamically controlling a variable matching network of a transmission path to operate at the center frequency of a radio frequency (RF) input signal and at one or more harmonics of the center frequency of the RF input signal as operating conditions change. provide the desired impedance. Background technique [0003] In wireless communication systems, designers are often forced to make compromises between competing performance parameters when designing transmission paths for communication devices such as mobile devices or base stations. Referring to FIG. 1, a typical transmission path of a wireless communication device is shown. The transmission path typically includes a control and modulation c...

AI Technical Summary

Problems solved by technology

[0014] Although the impedance at the center frequency of operation may be considered "ideal" for a given performance criterion, if the impedance matching network 14 is configured and controlled to provide an impedance at any given RF input signal RF IN the center frequency of , and the "ideal" impedance of at least one harmonic associated with that center frequency, the transmission path may be significantly better performing, as shown in Figure 6

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