A down-conversion device and method for a superheterodyne signal receiving and analyzing instrument

Abstract

The invention discloses a down-conversion device and method for a superheterodyne signal receiving and analyzing instrument. The down-conversion device comprises a filtering unit, a pre-amplificationunit, a pre-selection unit, a frequency mixing unit, two frequency conversion units and an output unit. According to the invention, the signal is filtered; mirror frequency and out-of-band rejection are eliminated; Pre-amplification selection is then performed, a common mode or a low-noise mode can be selected; and then the input signal is preselected in multiple paths, the preselected signal is subjected to frequency mixing processing in a high waveband path and a low waveband path to obtain two first intermediate frequencies with different frequencies, the two first intermediate frequenciesare filtered and amplified respectively and then subjected to secondary frequency conversion to obtain a second intermediate frequency with the same frequency, and the two paths of secondary intermediate frequencies are combined and then enter an intermediate frequency conditioning module to be processed. the hardware cost is reduced, the design integration level is improved, and the cost of the superheterodyne signal receiving and analyzing instrument is effectively reduced.

Description

technical field [0001] The invention relates to a down conversion device and method for a superheterodyne signal receiving and analyzing instrument. Background technique [0002] With the rapid development of electronic technology, signal analyzers have become an indispensable testing tool for electronic engineers, and have been more and more widely used in radio, television, radar, civil aviation and other communications electronic design and equipment maintenance, becoming a domestic and foreign The key research object of large instrument manufacturers. Thanks to the rapid development of microwave integrated circuit technology and computer-aided design technology, signal analyzers have begun to develop rapidly in the direction of miniaturization and modularization. Especially in recent years, due to the rapid popularization of wireless communication products, the demand for radio frequency band signal analyzers has been increasing. For the needs of field testing and produ...

AI Technical Summary

Problems solved by technology

However, for the input signal below 8GHz, the existing down-conversion scheme has great disadvantages, which are mainly manifested in: 1) Two-way frequency conversion needs to be performed with 4GHz as the boundary, the hardware structure is complex, and it takes up a lot of space, which is not conducive to integrated design

2) The 4GHz-8GHz input signal needs to be down-converted through microwave modules and circuit boards such as switch duplexers, YIG filters, low-noise amplifiers, local oscillator mixer modules, and microwave driver boards. The hardware cost is high and the resource utilization rate is low.

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