Adrian, Lim Hooi Jin
(2013)
Improved Techniques For Power
Consumption Reduction In
Portable Two-Way Radio.
PhD thesis, Universiti Sains Malaysia.
Abstract
In the two-way portable radios market, long battery life has become an
essential and critical customer requirement for communication during critical public
safety or rescue missions. Thus, in tandem with this need, various researches have
been conducted by industry players to reduce the power consumption of the design
with minimum sacrifices on product performance. This thesis presents various key
techniques that can be adopted into the design of portable two ways radio to reduce
the overall power consumptions of radio in three main areas in the portable radio
architecture from system level perspective; DC power supply topology for CMOS
based processor, LCD and keypad backlighting system and RF sections at idle mode.
In the DC power supply topology for CMOS based processor area, two techniques
were identified to optimize the overall efficiency of the power distribution network
by minimizing the power conversion lost in the multiple power conversion line up
and utilization of single and direct conversion in the portable radio architecture to
save up to 58% of power at battery input and prolonging the battery life of the
portable two-way radio by another 2.23 hours. Meanwhile, in the LCD and keypad
backlighting system, three techniques are identified to reduce the power
consumptions at battery input of up to 24% which includes careful selection of LED,
light guide and power management topology to drive the LEDs in an efficient
manner and prolonging the battery life of the portable two-way radio by another 0.39
hours.
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