RF Power Amplifier and UHF RFID Tag for Amplitude Modulation

Abstract

The invention discloses a radio frequency power amplifier and an ultra-high frequency radio frequency identification tag for amplitude modulation. The amplifier includes an input matching module, a first-stage amplification module, an inter-stage matching module, a second-stage amplification module, and an output matching module connected in sequence. Matching module, the input matching module is used to match the input signal to the first-stage amplifying module, the inter-stage matching module is used to match the output of the first-stage amplifying module to the input of the second-stage amplifying module, and the output matching module is used to connect the antenna The impedance of the second-stage amplification module is matched to the required output impedance of the second-stage amplification module; the second-stage amplification module is used to provide variable gain, and the second-stage amplification module includes a second inductor and at least two controllable power branches, each controllable The power branches are connected in parallel with each other and then connected in series with the inductor. Even in the case of low output power, the present invention can realize high energy utilization efficiency, thereby 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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