A 60 GHz High Gain Transformer-Coupled Differential Cascode Power Amplifier in 65 nm CMOS
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概要
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A fully differential high gain V-band three-stage transformer-coupled power amplifier (PA) is designed and implemented in 65 nm CMOS process. On-chip transformers which offer DC biasing for individual stages, extra stabilization mechanism, single-ended to differential conversion, and input/inter-stage/output matching are used to facilitate a compact amplifier design. The design and optimization methodologies of active and passive devices are presented. With a cascode configuration, the amplifier achieves a linear gain of 30.5dB centered at 63.5GHz and a -40dB reverse isolation under a 1V supply, which compares favorably to recent published V-band PAs. The amplifier delivers 9dBm and 13dBm saturation output power (Psat) under 1V and 1.5V supplies, respectively, and occupies a core chip area of 0.05mm2. The measurement results validate a high gain and area-efficient power amplifier design methodology in deep-scaled CMOS for applications in millimeter-wave communication.
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