Calibration method and calibration circuit for transmitted power of digital microwave transceiver

Abstract

The invention discloses a calibration method for the transmitted power of a digital microwave transceiver. The calibration method comprises the following steps of first generating a transmitted power calibration table according to transmitted power control voltages and actual radio frequency transmitted power which corresponds to the transmitted power control voltages and is transmitted by the microwave transceiver, second generating a channel calibration table, and thirdly correcting the transmitted power control voltage value in the transmitted power calibration table by using a channel correcting method. The invention further discloses a calibration circuit for achieving the calibration method for the transmitted power of the digital microwave transceiver. The calibration circuit comprises a microwave unit and a monitoring unit, and the microwave unit comprises a first power detection tube, a second power detection tube, a microwave amplifier and a microwave attenuator. The calibration circuit has the advantages of being high in batch production efficiency, high in calibration rate, high in transmitted power stability, simple in calibration method and the like.

Description

technical field [0001] The invention relates to a microwave radio frequency technology, in particular to a method for calibrating transmission power of a digital microwave transceiver and a calibrating circuit thereof. The invention is applicable to 5-42G digital microwave transceivers. Background technique [0002] The transmitter part of a digital microwave transceiver (radio frequency unit) is generally composed of multiple amplifiers, mixers, filters, and attenuators. Due to the poor consistency of microwave devices, it is greatly affected by temperature, causing the entire transmission link to The gain is unstable, which affects the accuracy of the output power of the transmitter (that is, the actual output power of the transmitter deviates greatly from the preset value); with the development of the communication industry, the operating frequency of digital microwave transceivers is getting higher and higher, and its passband Wider and wider, in such a wide frequency ra...

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Problems solved by technology

[0002] The transmitter part of a digital microwave transceiver (radio frequency unit) is generally composed of multiple amplifiers, mixers, filters, and attenuators. Due to the poor consistency of microwave devices, it is greatly affected by temperature, causing the entire transmission link to The gain is unstable, which affects the accuracy of the output power of the transmitter (that is, the actual output power of the transmitter deviates greatly from the preset value); with the development of the communication industry, the operating frequency of digital microwave transceivers is getting higher and higher, and its passband Wider and wider, in such a wide frequency range, the performance difference of devices at different frequencies is prominent, making it difficult to control the final output power of the transmitter. In the case of different transmission frequencies, the transmission power deviates greatly

[0003] In order to solve the above two difficulties that mainly affect the performance of the transmitter’s transmission power accuracy, in the prior art, the methods of normal temperature, high temperature, and low temperature calibration respectively, and multi-frequency point calibration are often used. The production of the product is difficult and the cost is high. Facilitate large-scale application and promotion

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