A transmission power calibration method and calibration circuit of a digital microwave transceiver
A transceiver and transmission power technology, applied in the field of microwave radio frequency, can solve the problems that affect the precision performance of transmitter transmission power, difficult production, high cost, etc.
Active Publication Date: 2017-02-15
波达通信设备(广州)有限公司
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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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[0087] Such as figure 1 Shown is a block diagram of the main modules of a digital microwave transceiver. The digital microwave transceiver includes an intermediate frequency unit, a microwave unit, a monitoring unit, a receiving link, and a cavity filter. The intermediate frequency unit includes an intermediate frequency power control circuit, a mixer circuit, and a filter amplifier circuit, etc., which amplify, filter, and up-convert the intermediate frequency signal, and provide a signal with stable power to the microwave unit (such as image 3 Shown); the microwave unit includes a detection circuit, a microwave attenuator, a mixer circuit, and a filter amplifying circuit. The microwave unit performs secondary upconversion and filtering on the transmitted signal, and then amplifies it again to output a radio frequency signal (5-42G), Cooperate with RF power control circuit to achieve RF power control (such as image 3 As shown); the monitoring unit includes an intermediate fre...
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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 the transmission power of a digital microwave transceiver and a calibration circuit thereof. The invention is suitable for a 5-42G digital microwave transceiver. 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 components, it is greatly affected by temperature, resulting in the entire transmission link The gain is unstable, which affects the accuracy of the output power of the transmitter (that is, the actual output power of the transmitter has a large deviation from the preset value); with the development of the communication industry, the working frequency of the digital microwave transceiver is getting higher and higher, and its passband Wider and wider, in such a wide fr...
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IPC IPC(8): H04W52/04
Inventor 吴开华黄均明陈勇杨龙星孟晓君
Owner 波达通信设备(广州)有限公司