IEEE Solid-States Circuits Magazine - Fall 2021 - 128

using their respective configuration
registers;
this
synchronization is
instrumental in applications such as
quadcopter drones and three-phase
ac drives. Similarly, PWM0 can be
synchronized to external events
(such as ADC events) through its
hardware synchronization input.
Reconfigurable Digital Filter Unit
Conventional successive approximation
ADCs are being replaced
in motor-control applications by
high-fidelity delta-sigma ADCs,
especially when galvanic isolation
is required. Fidelity is achieved by
using the noise-shaping characteristics
of the modulator, which leverages
a high-speed oversampling
(typically in the range of 10-20 MHz)
to convert the low-pass (LP) analog
signal into a nonreturn-to-zero
pulse-density-modulated (PDM)
bina ry data st ream, wh ich is
then optoisolated.
Sermo-soc is equipped with eight
DSI inputs, each capable of demodulating
an incident PDM stream.
A single 12.5-MHz clock is sourced
from sermo-soc to synchronize
all ADCs. Most signals of interest
in motor control are narrow-band
signals, including phase voltages
and currents, ambient temperature
and vibrations, and a simple LP filter
suffices. CIC filters represent
an efficient class of finite-impulse
response filters because of their
excellent power, performance, and
area profile. Essentially, an Nthorder
CIC filter consists of N stages
of integrators, followed by a decimation
by a ratio (R), followed by N
stages of differentiators. The input
PDM signal is downconverted to an
n-bit pulse-code modulated representation,
with a sinc-N LP response
that shows its first notch at Fs
/R.
PFA
CIC32
Each CIC64 Block Consists of
Eight CIC8 Blocks, Cascaded
to Make CIC16, CIC32, and
CIC64 Blocks.
CICcon
CIC16
CIC8
A CIC8 Block Is Configured as
Integrator, Differentiator,
Register, or Zero.
Each CIC Block Can Be Chained
to the Next Block, as Shown at Left.
Temperature
Sensor
Voltage
Monitor
Vibration
Sensor
DSI
DSI
DSI
DSI
DSI
DSI
DSI
DSI
sinθ
cosθ
Sermo-soc
PWM
PID
QEI
Quadrature
Encoder
PWM
PID
QEI
PWM
PID
QEI
∆Σ
PWM
PID
QEI
Isolated Current
Sensors
U
V
W
3φ ac
Motor
H-Bridge
dc Motor
θ
FIGURE 7: Block diagram and use cases of sermo-soc in dc servomotors and sensorless SVPWM control of ac motors.
PFA: programmable filter array.
128
FALL 2021
IEEE SOLID-STATE CIRCUITS MAGAZINE
CIC64-0
CIC64-1
CIC64-10
HEXINV

IEEE Solid-States Circuits Magazine - Fall 2021

Table of Contents for the Digital Edition of IEEE Solid-States Circuits Magazine - Fall 2021

Contents
IEEE Solid-States Circuits Magazine - Fall 2021 - Cover1
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IEEE Solid-States Circuits Magazine - Fall 2021 - Contents
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