Radio-frequency power amplifier for amplitude modulation and UHF radio frequency identification tag

Abstract

The invention discloses a ratio-frequency power amplifier used for amplitude regulation, and an ultrahigh ratio-frequency identification tag. The amplifier comprises an input matching module, a first stage amplifying module, an interstage matching module, a second stage amplifying module and an output matching module which are connected sequentially. The input matching module is used for matching an input signal to the first stage amplifying module; the interstage matching module is used for matching the output of the first stage amplifying module to the input of the second stage amplifying module; the output matching module is used for matching the impedance of an antenna to the output impedance required by the second stage amplifying module; the second stage amplifying module is used for providing changeable gains and comprises a second inductor and at least two controllable power subcircuits which are connected with each other in parallel and then connected with the inductor in series. The invention also can realize relatively high energy utilization efficiency even under the condition of relatively small output power, thus ensuring high efficiency.

Description

technical field [0001] The invention relates to a radio frequency power amplifier for amplitude modulation, and also relates to an ultra-high frequency radio frequency identification tag containing the radio frequency power amplifier for amplitude modulation. Background technique [0002] Ultra High Frequency Radio Frequency Identification (UHF RFID for short) is a non-contact automatic identification technology, which automatically identifies the target object and obtains relevant data through radio frequency signals, without manual intervention, and can work in various Harsh environment, with great advantages in fast scanning, miniaturization, anti-pollution, good durability, reusable, penetrable reading, large data memory and reliable data security, etc., is being widely used in various industries, such as Logistics warehousing, intelligent transportation, automatic toll collection, sea and air port cargo management, supermarket retail management, medical equipment manage...

AI Technical Summary

Problems solved by technology

Since the efficiency of the actual linear power amplifier will not exceed 40% even at the maximum output power, not to mention when the ASK modulation requires different output power, the overall efficiency of the ordinary linear power amplifier is far less than 40%.

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