Serial Biasing / Current Recycling Lab

Same ampere threads stacked ground islands. Gain: cryocable current. Pay: isolation when SFQ crosses islands, taller voltage stack. Not ERSFQ (heat) and not AQFP (AC family).

Islands M 3

I per island (A) 0.5

Send pulse across islands

I_parallel ≈ Σ I_i ···

I_supply

1.5 A

V stack cartoon

1×

Isolation sites

Cross result

—

≠ ERSFQ?

YES

Islands + bias current · dashed = isolation / transformer when crossing

Ideal cartoon: I_serial ∼ max I_i vs I_parallel ∼ Σ I_i. Intra-island timing (path balance / STA) still applies. Every necessary crossing is an isolation site.