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SM发射机电源电压恒定的发射功率

消耗积分:1 | 格式:pdf | 大小:717 KB | 2012-01-10

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Abstract: In battery-powered RF transmitters such as garage door openers and remote keyless entry for cars, as the battery drains,
the transmit power typically falls. This application note demonstrates that combining a high-efficiency step-up, or boost, voltage
converter with an ISM transmitter will keep the transmitted power constant (under 0.5dB variation) over the battery voltage range.
Performance data will show that the battery life for constant transmit power is up to 2 times that of a transmitter whose power drops
as the battery voltage drops. The AC voltage ripple produced by the voltage converter does not degrade the quality of the amplitudeshift
keying (ASK) data link and does not violate U.S. and European radio emission standards relating to short-range radio links.
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