L4S Support in 802.11bn for Improved Latency Performance
This document discusses the proposal for supporting Low Latency, Low Loss, Scalable Throughput (L4S) in IEEE 802.11bn to enhance end-to-end latency performance. It covers the implementation of L4S dual queue Active Queue Management (AQM) at the MAC layer, Congestion Experience (CE) marking, and addressing scenarios where a peer lacks L4S support at the MAC layer but is L4S capable in upper layers.
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Presentation Transcript
AD 4528 equivalent block diagram (from AN-1114 application note of Analog Design) Chopper modulation is applied only to the first stage Feedback loop for reduction of the offset ripple High frequency path (not chopped) to obtain a wide bandwidth P. Bruschi Mixed Signal Design 1
A recently introduced chopper op-amp Very low offset voltage Note: residual offset and flicker noise shifted at the clock frequency Very low noise density down to low frequencies P. Bruschi Mixed Signal Design 2
Note: relatively high bias currents for a CMOS amplifier: effect of charge injection from the input switches Note: relatively low input resistance (effect of alternating Vin and Vin across the input capacitance) P. Bruschi Mixed Signal Design 3
Finite input resistance of chopper amplifiers Amplifier input capacitance Input modulator = = ( ) 2 Q V V C V C end start in in in Phase 2 V C = 2 Q in in Let us start from phase 1 Phase 1 again V I 1 = = = 4 Q V C (one period) in R tot in in eq 4 C f eq in ck 4 V C = = in T in 4 I V C f = = 2 Q V C 2 Q V C eq in in ck in in in in P. Bruschi Mixed Signal Design 4
