Several μ-bridge structures for InP-based heterojunction bipolar transistors （HBTs） are reported. The radio frequency measurement results of these InP HBTs are compared with each other. The comparison shows that μ...
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Several μ-bridge structures for InP-based heterojunction bipolar transistors （HBTs） are reported. The radio frequency measurement results of these InP HBTs are compared with each other. The comparison shows that μ-bridge structures reduce the parasites and double p-bridge structures have a better effect. Due to the utilization of the double/^-bridges, both the cutoff frequency fτ and also the maximum oscillation frequency fτ of the 2 × 12.5 μm2 InP/InGaAs HBT reach nearly 160 GHz. The results also show that the μ-bridge has a better effect in increasing the high frequency performance of a narrow emitter InP HBT.
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