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This paper presents a wideband differential amplifier operating at 138 GHz in 40-nm CMOS. It is composed of five differential common source stages with cross-coupled capacitors. A small-signal gain of 18 dB at 138 GHz and a 3-dB bandwidth of 27 GHz are achieved. It consumes 75 mW from a 0.94-V voltage supply. The die area with balun and pads is 945 × 842 μm2 and the core size not including input/output...
This paper presents a compact wideband amplifier at 160 GHz in 40-nm CMOS. Typical wideband amplifier design requires higher-order matching networks and more gain stages, both of which demand larger die area. The presented 8-stage amplifier uses a compact “fishbone” layout technique, and its core size is as small as 190 × 123 µm2. A small-signal gain of 15 dB at 160 GHz and a 3-dB bandwidth of 41...
A wideband decoupling power line for millimeter-wave circuits can be realized with a transmission line having an extremely low characteristic impedance, Z0 → 0Ω. It is, however, very difficult to characterize such a line with the ordinary two-port S-parameter measurement. This paper presents an alternative measurement technique that uses transmission line stubs. The measurement results confirm that...
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