The invention discloses an improved
cascode radio frequency power
amplifier. A common-source-stage
transistor grid
electrode G1, a common-source-stage
transistor source
electrode S, a common-grid-stage
transistor grid
electrode G2 and a common-grid-stage transistor drain electrode D are transversely arranged on a substrate, a
radio frequency input end RFin is connected with the common-source-stage transistor grid electrode G1 through a
metal routing wire, the common-source-stage transistor source electrode S is connected with a grounding hole array through a
metal routing wire, the common-grid-stage transistor grid electrode G2 is connected with a bias circuit through a
metal routing wire, and the common-grid-stage transistor drain electrode D is connected with a
radio frequency output end RFout through a metal routing wire. A
cascode structure is adopted, and a
layout structure is optimized, so that the improved
cascode radio frequency power
amplifier has the advantages of high
gain, high power, high
linearity, high efficiency and the like;
layout area equivalent to that of a single-transistor common-
source structure radio frequency power
amplifier is maintained, so that low cost is realized.