Broadband CMOS (Complementary Metal Oxide Semiconductor) power amplifier capable of reconstructing interstage matching

Abstract

The invention discloses a reconfigurable inter-stage matching broadband CMOS power amplifier, and belongs to the technical field of integrated circuits. A received radio frequency input signal is amplified by a driving-stage amplifier and then output to a power-stage amplifier through a reconfigurable inter-stage matching network to be amplified and then output; the reconfigurable inter-stage matching network comprises a CLC matching network, a reconfigurable matching capacitor, a reconfigurable matching inductor and two groups of switches; the two groups of switches are respectively connectedwith the reconfigurable matching capacitor and the reconfigurable matching inductor in series; according to different working frequency bands, the equivalent inductance values of the parallel inductor and the reconfigurable matching device in the CLC network are changed through on-off of the switch, so that the reconfiguration of the matching network is realized. The high-Q-value interstage impedance matching network is simple and reliable in structure, does not influence output power and efficiency, does not increase power consumption, can realize relatively high gain, and can ensure that multiple frequency bands meet high output power and high efficiency, thereby overcoming bandwidth limitation of the high-Q-value interstage impedance matching network and realizing broadband application.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a wideband CMOS power amplifier capable of reconfigurable inter-stage matching. Background technique [0002] As one of the core modules of wireless transmitters, power stage amplifiers are widely used in mobile communication systems. In mobile communication terminals, the design challenge of RF power amplifiers is mainly the application requirements of one power amplifier covering multiple frequency bands. A feasible solution is to design a broadband power stage amplifier, and then switch to a specific frequency band through a distributed switch. At present, the research focus of broadband power amplifiers is mainly on the design of single-stage power amplifier broadband load matching network. However, the gain of single-stage power amplifier is difficult to meet the high gain requirements of mobile communication terminals. Although the design of the mu...

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Problems solved by technology

At present, the research focus of broadband power amplifiers is mainly on the design of single-stage power amplifier broadband load matching network. However, the gain of single-stage power amplifier is difficult to meet the high gain requirements of mobile communication terminals.

Although the design of the multi-stage power amplifier achieves high gain, the inter-stage matching of the multi-stage power amplifier is often a high-Q matching network with narrow-band characteristics, which limits the bandwidth of the power stage amplifier.

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