Abstract
This paper proposes a low-voltage cascode (CC) power amplifier (PA) for IEEE 802.11aj (45 GHz) application. A capacitor coupling technology is employed to adapt the CC PA to low-voltage systems. By deploying an asymmetrical capacitor to the balun, the maximum phase unbalance is suppressed from 1.7° to 0.2°. For the proof of concept, a low-voltage CC PA was fabricated in a 0.13-µm SiGe BiCMOS technology with a core size of 0.93×0.53 mm2. Measurements for 1.5-V VDD show that, at 42-/44-/46-/48-GHz, the PA achieves 14.8-/14.6-/14.5-/14.6-dBm output 1-dB compression point (OP1dB). In the frequency band of 6.5 GHz from 42 to 48.5 GHz, the small-signal gain is 27.5-29.5 dB, and the S22/S11 is better than −9.5/−10.5 dB.
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