Tesis
A 0.18μm CMOS internally-compensated low-dropout voltage regulator
Autor
CARLOS FELIPE VENTURA ARIZMENDI
Institución
Resumen
The massive proliferation of battery-operated portable devices, such as cellphones, laptops
or wireless sensor networks, has made power management one of the IC industry
major concerns. In this scenario, low-dropout (LDO) voltage regulators have turned
into the preferred choice for low-voltage on-chip power management solutions, because
of their fast response, simplicity and low cost of implementation.
An LDO is a linear voltage regulator with a common source (or common emitter)
output stage, showing improved efficiency over the conventional linear regulators at
the cost of higher complexity. These regulators normally require an external capacitor
of the order of µF to operate properly, which makes them unsuitable deployment in
applications SoC (system on chip). The LDO regulator must supply a constant, noisefree,
accurate and load-independent voltage level, with particular DC, AC and transient
characteristics, such as load and line regulation, stability and transient response, which
will depend on the actual application.
A fully-integrated 0.18µm CMOS Low-Dropout (LDO) Voltage Regulator with
current mode internal frequency compensation suitable for battery-operated systems,
e.g. WSN motes, is presented in this thesis. The regulator provides a maximum output
current of 70mA for up to 50pF capacitive load. The regulated output voltage can
be chosen to be either 1.2V or 1.8V , with a supply voltage ranging from 3.3V to 2.1V .
The simulation results showed that the performance of the proposed LDO regulator is
set to the given specifications and even improves some qualities of previously works,
such as line regulation (LNR = 0.24mV=V ).
Materias
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