IEEE Solid-States Circuits Magazine - Summer 2022 - 76

Digital IMC
Analog Memory Array and Write Feedback
W
IN1
W
IN2
W
IN3
W
IN4
Digital
Accumulation
Shift/
Add
Digital Multiply
(a)
Vmem0
WFB Amps
-
+
Vwfd0
Vmem1
-
+
(b)
FIGURE 9: Addressing ADC challenges by (a) digital IMC [56] and (b) analog memory-based all-analog design [57]. WFB: write-with-feedback.
digital logic gates while adding such
digital accumulation circuitry inside
the IMC SRAM macro for every group
of columns. Such digital IMC designs
eliminate ADCs, since all computations
are in the digital domain, and
are also advantageous for CMOS
scaling and lower Vdd operation.
However, the digital implementation
of the wide adder tree can consume
a large area; thus, a compact implementation
becomes important.
All-Analog AI Accelerator
On the other hand, an all-analog DNN
accelerator " ARCHON " in 28 nm was
presented in [57] [Figure (9b)], which
comprises both analog computation
and capacitor-based analog memory
(AMEM). ARCHON features an analog
neuronal computation unit
(ANU)
Elementwise
Pruning
Small Group
Pruning
Medium Group
Pruning
Large Group
Pruning
based on voltage-to-time converters
and weighted current summation as
well as an AMEM based on a 6T1C
bitcell that can store ~5-b precision
across PVT variations. The ANU and
AMEM can perform the computations
needed for CNNs in the analog
domain across layers without data
conversions. ARCHON achieves an
energy efficiency of 332.7 TOPS/W (the
analog datapath) and 19.9 TOPS/W
(the processor level).
IMC Parallelism ↑, Latency ↓, and Energy Efficiency ↑
Sparsity ↑, and IMC Hardware Accuracy ↑
FIGURE 10: The tradeoffs of pruning for IMC designs [65].
76 SUMMER 2022
IEEE SOLID-STATE CIRCUITS MAGAZINE
Addressing Density
To support IMC, the SRAM bitcell
and macro areas are both becoming
relatively large. To alleviate the density
concerns, IMC designs based on
eNVM, such as RRAM (with a singlelevel
cell [59] and multilevel cell
[60]), PCM [61], MRAM [62], and Flash
[63], have been presented. Such
eNVMs are denser than SRAM and
Vwfd1
Digital Partial
Sum
AMEM Matrix
Vin,0
Vin,1
WR0
RD0,0
RD0,1
RD0,2
WR1
RD1,0
RD1,1
RD1,2
WR0
RD0,0
RD0,1
RD0,2
WR1
RD1,0
RD1,1
RD1,2
Act. 4
AG 3
Act. 2 Act. 1
Act. Group 2
Act. Group 1
Act. Group
Vout0,0
Vout0,1
Vout0,2
Vout1,0
Vout1,1
Vout2,2

IEEE Solid-States Circuits Magazine - Summer 2022

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