A frequency spreading structure

Abstract

The invention provides a frequency extending structure. The frequency extending structure comprises a frequency mixer and a Balun structure, wherein the frequency mixer comprises an RF input port, an LO input port and two output ports, a signal to be processed is input into the RF input port, a local oscillating signal is input into the LO input port, and the two output ports output two paths of I / Q signals respectively; the Balun structure comprises an isolation output port, a medium-frequency output port and two input ports, the two input ports are connected with the two output ports of the frequency mixer respectively, the isolation output port is connected with a matched load, and the medium-frequency output port outputs medium-frequency signals. According to the frequency extending structure, noise of the signal to be processed can be effectively lowered, frequency conversion loss during frequency conversion is reduced, a proper noise coefficient is obtained, the frequency conversion function is achieved, the output medium-frequency signals are single-side-band signals, the accuracy of the signals is greatly improved, and requirements of subsequent processing are met.

Description

technical field [0001] The invention relates to an electronic technology, in particular to a frequency extension structure. Background technique [0002] Noise figure is one of the key indicators of radio frequency circuits in wireless communication systems. It determines the sensitivity of the receiver and affects the signal-to-noise ratio of analog communication systems and the bit error rate of digital communication systems. The rapid development of wireless communication has higher and higher requirements on the noise performance of radio frequency circuits, and the frequency band used in wireless communication is also developing to a higher level, which requires the ability to reduce the noise of radio frequency circuits as much as possible when processing signals at high frequency bands coefficient. [0003] In the existing processing of the high frequency band of the circuit to be tested, it is usually necessary to convert the high frequency signal to obtain an inter...

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Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a frequency extension structure, which is used to solve the problems of large frequency conversion loss and spurious spectrum interference caused by converting high-frequency signals into intermediate-frequency signals in the prior art.

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