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ISM Transmitter Has Constant Transmitter Power for Varying Supply Voltage

Authored on: Jan 9, 2012

Technical Paper / Application Note

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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.
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Blackdog0 Posted Aug 15, 2013

Normally the operating range reduces and indicates to the user that it is time to replace the batteries. The disadvantage of this proposal is that the transmitter will suddenly stop working with no warning at all.

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