Linear control system of broadband solid-state power amplifier and control method thereof

Abstract

The invention discloses a linear control system of a broadband solid-state power amplifier and a control method thereof, the system comprises a control unit, a preceding-stage power amplifier unit and a last-stage power amplifier unit, and is characterized in that the preceding-stage power amplifier unit and the last-stage power amplifier unit are sequentially connected in series, and the control unit is respectively connected with the preceding-stage power amplifier unit and the last-stage power amplifier unit. According to the invention, combined control of radio frequency input power attenuation control and chip drain electrode voltage regulation is adopted, linear multi-gear control of transmitting power in an ultra-wideband range is realized, and the ultra-wideband linear multi-gear control circuit has the advantages of linearly adjustable ultra-wideband power, automatic and rapid power regulation, high control precision, simple control implementation, low operation cost and the like.

Description

technical field [0001] The invention belongs to the technical field of power amplifier control, and specifically relates to a linear control system and a control method of a broadband solid-state power amplifier. Background technique [0002] The measurement equipment of electromagnetic scattering characteristics of non-cooperative military targets is the key equipment to evaluate the stealth effect of real military targets, especially stealth targets. In the measurement work, the measurement of the radar cross section (RCS) of the weapon equipment is the main means to evaluate its electromagnetic scattering characteristics. [0003] Military targets such as airplanes and ships are generally equipped with electronic reconnaissance and countermeasure equipment, and the radiation signal characteristics of the measurement equipment are similar to those of fire control radars. This type of radiation characteristics and high SNR (meaning greater power) are easily detected by mili...

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Problems solved by technology

[0006] The current linear control method for solid-state power amplifiers is mainly radio frequency input power attenuation control, which is limited by GaN power chips and broadband power dividers. This method is generally used in narrowband (limited to a certain frequency range). Even when ultra-wideband (above 3 octaves), the linearity and power gain flatness of the amplifier are difficult to meet the requirements, and the small linear range is not suitable for fine linear work control; in actual use, a single control method can no longer meet the wideband frequency range. The linear control will cause the lack of actual control sensitivity and effectiveness

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