Fig. 7: Inverse-designed broadband mm-Wave amplifier chip with 3-port unequal phase divider and combiner for optimal frequency extension. | Nature Communications

Fig. 7: Inverse-designed broadband mm-Wave amplifier chip with 3-port unequal phase divider and combiner for optimal frequency extension.

From: Deep-learning enabled generalized inverse design of multi-port radio-frequency and sub-terahertz passives and integrated circuits

Fig. 7

a A broadband mm-Wave amplifier architecture that relies on asymmetrical power division at the input, and phase compensating combiner to create broadband frequency response. The three-port input and output combiners are synthesized through inverse design, and they are co-designed with multi-stage integrated active circuit amplifiers (that have complex terminating impedances). b The input signal splits into two asymmetrical paths, gets amplified through multiple stages, and recombines at the output with approximately same total phases in both paths. Simulated output combiner loss, ideal driving phases (−Φ) and input phase path (+Φ) showing near-ideal combination of the signal at the output. c Chip micrograph (750 × 1500 μm) showing the fabricated chip in an industry-standard 90-nm BiCMOS process. d Measured small signal response of the chip shows 3 dB bandwidth of 23.6-37.3 GHz with peak gain of  ≈ 17.5 dB, owing to the asymmetrical networks synthesized through the inverse design approach.

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