一款基于源栅耦合变压器技术的70.3～86.6 GHz宽带低噪声放大器OA

A 70.3～86.6 GHz low-noise amplifier(LNA)was investigated,which can be applied simultaneously to E-band communication and 77 GHz automotive radar systems.The LNA employs a three-stage differential architecture to suppress common-mode noise.In the input stage,a source-gate-coupled-transformer-based noise-cancellation and equivalent transconductance enhancement technique is implemented to simultaneously reduce noise and boost gain.Together with a single-ended-to-differential balun,the input network achieves both impedance and optimal noise matching.The intermediate stage uses a common-source configuration with neutralization capacitors to improve gain and stability,while the output stage employs a cascode topology with a common-gate short-circuit technique and dual neutralization capacitors scheme to mitigate parasitic effects and further enhance gain and stability.Additionally,an inductor is introduced between the source of the common-gate transistor and the drain of the common-source transistor to alleviate parasitic effects and extend the cutoff frequency.Simulation results demonstrate that the proposed LNA achieves a peak gain of 22.54 dB,a 3 dB bandwidth covering 70.3～86.6 GHz,and a minimum noise figure of 5.48 dB,with noise variation less than 0.69 dB across the operating band.The input and output return losses are both better than those at-8.5 dB,and the input 1 dB compression point(IP1dB)is-16.39 dBm.