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Abstract
This paper presents a 324-GHz signal source/transmitter. Input signal of 81 GHz is applied to a differential pair for conversion to 324 GHz via two cascaded push–push frequency doublers. Stacked push–push configuration is used for enhancing the output power at 324 GHz and passive baluns with asymmetrical grounding stub is deployed to improve the power efficiency. The 81-GHz signal can correspondingly be modulated to function as a modulator. The proposed design is fabricated using 0.13- $\mu{\hbox{m}}$ SiGe BiCMOS process. The total chip area is 0.95 mm $\times$ 1 mm. With the buffers, the total DC consumption is 42.5 mW. The maximum output power is $-$ 6.5 dBm at 324 GHz when the input power of the 81-GHz signal is of 0 dBm. The ability to transmit modulated signals has also been demonstrated in the proposed circuit.
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