IEEE Solid-States Circuits Magazine - Summer 2020 - 17

VDD

RDD C
DD
i (t )
i2(t )

i1(t )

vi (t )

A

vo (t )

In summary, the current drawn
by adjacent circuits from the same
power supply injects noise to sensitive analog amplifiers and contaminates the signal. This, if not
addressed by one of the power supply rejection techniques, results in
deterioration of the SNR.

References

very low impedance at high frequencies (1/~C DD), effectively shorting all
high-frequency currents to ground
and not letting them go through R DD.
This is low-pass filtering the power
supply noise. The higher the capacitance, the lower is the cutoff frequency of this filter.

A third solution is to design a
voltage regulator, that is, a circuit
that takes the noisy power supply
and produces a cleaner one, meaning one that has greatly suppressed
the power supply noise. We will
review an example voltage regulator
in the next article of this series.



IMAGE LICENSED BY INGRAM PUBLISHING

FIGURE 5: Capacitor CDD placed at the supply node of amplifier A attenuates the high-frequency content of the currents being drawn by the amplifier (i(t)) and the two digital blocks
(i1(t) and i2(t)).

[1]	 A. Sheikholeslami, "Thevenin and Norton equivalent circuits: Part 1," IEEE
Solid State Circuits Mag., vol. 10, no.
2, pp. 8-10, Spring 2018. doi: 10.1109/
MSSC.2018.2822858.
[2]	 A. Sheikholeslami, "Thevenin and Norton equivalent circuits: Part 3," IEEE
Solid State Circuits Mag., vol. 10, no. 3,
pp. 7- 8, Summer 2018. doi: 10.1109/
MSSC.2018.2844613.
[3]	 A. Sheikholeslami, "Thevenin and Norton
equivalent circuits: Part 3," IEEE Solid State
Circuits Mag., vol. 10, no. 4, pp. 7-9, Fall
2018. doi: 10.1109/MSSC.2018.2867139.
[4]	 A. Sheikholeslami, "Looking into a node,"
IEEE Solid State Circuits Mag., vol. 6, no.
2, pp. 8-10, Spring 2014. doi: 10.1109/
MSSC.2014.2315062.

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