Radio frequency measurement device with amplifier

Abstract

Embodiments of the invention provide a radio frequency measurement device with an amplifier. The device comprises a radio frequency measurement device body and a preamplifier, wherein the preamplifier particularly includes an amplifier and a DC bias circuit connected to an output terminal of the amplifier. The DC bias circuit comprises a DC power supply and a radio frequency choke arranged between the amplifier and the DC power supply. The radio frequency choke comprises a first inductor and a second inductor which are in series, and inductance of the first inductor is smaller than that of the second inductor. Arrangement of the two inductors in series with different inductance in the radio frequency choke solves the technical problem that a radio frequency choke in a preamplifier of a radio frequency measurement device in the prior art cannot take care of both high and low frequency bands. The inductor with smaller inductance is higher in self-resonant frequency and is used to ensure gains of a high frequency band amplifier, and the inductor with larger inductance is lower in self-resonant frequency and is used to ensure gains of a low frequency band amplifier.

Description

technical field [0001] The present invention relates to radio frequency communication technology, in particular to a radio frequency measurement device, specifically a radio frequency measurement device with an amplifier. Background technique [0002] RF measurement devices mainly include RF signal sources, spectrum analyzers and other instruments. The spectrum analyzer is an instrument for studying the spectrum structure of the measured signal. It is used to measure the frequency, amplitude, distortion and other related parameters of the unknown signal. It has a wide frequency measurement range and low amplitude monitoring sensitivity. Spectrum analyzers are mainly used in base station maintenance, electronic product research and development, production and other fields. [0003] In the prior art, a radio frequency measurement device generally includes a preamplifier and a radio frequency measurement device body, wherein the preamplifier usually has a frequency range from ...

AI Technical Summary

Problems solved by technology

[0005] An embodiment of the present invention provides a radio frequency measurement device with an amplifier. By setting two stages of series inductors in the radio frequency choke coil, the inductance values ​​of the two stages of inductance are different, and the self-resonant frequency of the smaller inductance is higher, which is used to ensure the The gain of the amplifier; the self-resonant frequency of the large inductance is low, which is used to ensure the gain of the amplifier in the low frequency band, and solves the technical problem that the radio frequency choke coil in the preamplifier of the radio frequency measurement device in the prior art cannot take into account the high and low frequency bands

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