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This paper proposes a tail-feedback VCO with adaptive current modulation scheme. The proposed current modulation scheme ensures robust startup conditions for the tail-feedback VCO. The proposed VCO is implemented in a 0.18-µm CMOS process. The measured phase noise is −119.3dBc/Hz at 1MHz offset with a power dissipation of 6.8mW at 4.6GHz.
A K-band power amplifier (PA) with adaptive bias circuitry is implemented in 90-nm CMOS technology. The two-stage transformer-coupled differential PA achieves a linear gain of 26.9 dB, a saturation output power (Psat) of 20.4 dBm, an output 1-dB compression point (P1dB) of 18.5 dBm, and a peak power-added-efficiency (PAE) of 17.3% at 21 GHz. With the on-chip adaptive bias control, the bias condition...
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