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This paper introduces a W-band sequential power amplifier (PA) \cite{0th} with a novel output network designed to minimize passive and combiner losses, while reducing the overall footprint compared to conventional sequential and Doherty PAs\cite{1st}. An isolated output combiner sums two PAs operating in two different modes: the main amplifier operates in class AB and the auxiliary amplifier operates in class C. The measured PA achieves a saturated output power ($$\mathbf{P_{sat}}$$) of 13 dBm and a gain of 12.5 dB with 3 dB bandwidth from 79.5 GHz to 94.5 GHz. Additionally, it demonstrates a peak Power Added Efficiency (PAE) of 19.4\% and a 14.6\% PAE at 6 dB power back-off (PBO) at 87.5 GHz. Furthermore, the PA achieves a data rate of 12 Gb/s for a 16QAM signal with an average output power of 5 dBm, an average PAE of 10\%, and an EVM (RMS) of -20 dB. The PA was fabricated in 16-nm FinFet technology with core area of 0.15mm$^2$. To the authors’ knowledge, this PA has the highest PAE at 6dB PBO for CMOS PAs operating in the W-Band.