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This text was extracted from a Microsoft Word document.
This is the abbreviated version, containing approximately
92% of the total text.
radio battery with integrated DC/DC converter
by Christoph Gebauer
An integrated DC/DC
converter provides an additional higher supply voltage inside a low voltage
radio battery case
This paper describes
improvements in the field of power supply methods used for portable radios.
To Be Solved
Modern portable radios use
low voltage batteries e.g. 3.6V lithium cells for power supply. But mostly at
least one higher supply voltage is needed for tuning or control purposes e.g.
charge pump circuitry in a PLL or as DAC reference voltage. That means that the
low voltage battery has to be converted to an additional higher supply voltage
by a switched regulator (DC/DC-converter) on the radio PCB. Because of the
voltage converting method which causes a large frequency spectrum the placement
as well as the shielding and grounding are realize difficulty. Furthermore the
switching regulator occupies valuable PCB space.
Solution to the Problem(s)
The idea to resolve the
problem is to locate the switching regulator circuitry inside the battery case
taking advantage of the battery low impedance as charging capacitance. The
switched regulator output voltage is available at an additional battery output
pin. An optional shielding of the switching regulator can avoid radiated
emission that impacts the radio performance (self quieting, transmitting
spurs). The switched regulator could be switched on/off e.g. by a control line.
Generally the adva...