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A fully integrated transformer-based tunable impedance-matching network is described. The tuning network independently tunes the real and imaginary parts of the impedance. A test chip implemented in a 40-nm CMOS process achieves the resistive tuning range of one octave, making it suitable for shared Bluetooth/Wi-Fi power amplifier (PA) applications. The main sources of insertion loss are identified, and strategies to minimize the insertion loss while maximizing the tuning range of the real and imaginary parts are discussed in this brief. [ABSTRACT FROM PUBLISHER]

This paper proposes a multistage transformer-feedback-based design approach for a high fractional-bandwidth (fBW) IF stage in a 60-GHz heterodyne receiver. An in-depth analysis of source-to-gate transformer-feedback amplifiers, including the design of the matching network, is presented. Analytic expressions for the input resistance, quality factor, and noise figure (NF) as a function of the transformer turns-ratio (n) and magnetic coupling factor (k) are derived. To validate the proposed analysis, a wideband IF amplifier and mixer were designed in a 40-nm CMOS process. From measured results, this device achieves a 16% -3-dB fBW, a peak power gain of 27.6 dB, an NF of 5.3 dB while consuming 28.8 mW from a 0.9-V supply. [ABSTRACT FROM AUTHOR]