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Design of an Ultralow power voltage regulator for RFID applications
Design of an Ultra-low power voltage
regulator for RFID applications
MP3a-06
Thesis researcher: Fung Sheung Wai Supervisor : Professor Philip K.T. Mok
OverView
Radio Frequency Identification (RFID) is a wireless communication
system that commonly used in many areas, such as assess system or
tracking of object. RFID mainly consist of two parts, a reader and a tag.
There are two kinds of tags, which is an active one and a passive one. For
the passive tag, it does not use any battery and the power is comes form
the RF (radio frequency) energy transmitted from the reader. So the
power in passive tag is very limited. In addition, for the passive tag to
operate properly, a more regulated DC power supply is required. Thus a
Low dropout voltage regulator (LDO) is always used inside the passive
tag and it is a great interest to design a LDO for passive tag.
Low Dropout voltage regulator is popularly used in many portable
electronic, as it can provide a low noise and regulator power supply.
However, a conventional LDO is not suitable for passive tag. It is because
the specifications of an LDO for passive tag are very different from the
conventional one (shown in table below). Thus we need to design a new
LDO for passive tag.
Specifications An LDO for passive A conventional LDO
tag
Output 250 pF 5µF
capacitance
Load current 0.1 µA– 25µA 0.1mA– 100mA
range
Quiescent current 400nA 100µA
Memory Read: Load current Load current is 100mA
operation is 0.5µA for 2.5ms
Write: Load current
is 25µA for 6ms
PSRR @100kHz -20dB @1kHz
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