Modeling method for output response of receiver frequency mixer

A technology of output response and modeling method, which is applied in the direction of transmission monitoring, transmission system, electrical components, etc., and can solve the problems affecting the performance of the subsequent stage circuit, the inability to accurately calculate the output response of the mixer, and multiple interference frequency components.

Active Publication Date: 2014-11-19
CHINA SHIP DEV & DESIGN CENT
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Problems solved by technology

[0002] When electronic equipment such as radar and communication work in an interference environment, the mixer of the receiver is often in a nonlinear response state, which will generate more interference frequency components and af

Method used

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  • Modeling method for output response of receiver frequency mixer
  • Modeling method for output response of receiver frequency mixer
  • Modeling method for output response of receiver frequency mixer

Examples

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Embodiment Construction

[0037] The present invention will be described in detail below in conjunction with examples.

[0038] Taking a receiver mixer as an example, its main technical parameters: the negative gain G of the mixer is -6dB, the third-order intermodulation point P I3 30dBm, the coupling degree dB from the local oscillator end to the intermediate frequency end LO-IF 20dB, coupling degree dB from RF end to IF end RF-IF 20dB, the coupling degree dB from the local oscillator end to the radio frequency end LO-RF is 30dB. Main input parameters: local oscillator signal power P dBm is 30dBm, the signal frequency of the local oscillator is f LO at 800MHz, the load resistor R L is 50Ω.

[0039] Depending on the load resistance R L , Signal power at the local oscillator terminal P dBm And formula (3) obtains fundamental wave voltage amplitude A=10;

[0040] According to the fundamental wave voltage amplitude A, the local oscillator signal frequency f LO And formula (2) to get the local os...

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Abstract

The invention discloses a modeling method for the output response of a receiver frequency mixer. The method comprises the following steps: (1) acquiring a local oscillation end signal, a radiofrequency end signal, a signal leaking from a local oscillation end to a medium-frequency end and a signal leaking from a radiofrequency end to the medium-frequency end of the frequency mixer; and (2) summing the product of the local oscillation end signal and the radiofrequency end signal, the signal leaking from the local oscillation end to the medium-frequency end and the signal leaking from the radiofrequency end to the medium-frequency end to obtain the output response of the receiver frequency mixer. Through adoption of the modeling method, the three nonlinear effect factors of the radiofrequency end negative gain transmission effect, a local oscillation end switching effect and a port-to-port coupling effect of the frequency mixer are considered comprehensively, the output response of the frequency mixer is obtained according to known quantities such as the performance parameter of the frequency mixer and an input signal, the nonlinear modeling accuracy of the frequency mixer is ensured, and the nonlinear output response characteristic of the receiver frequency mixer under an interference environment is predicted and computed accurately.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic interference prediction and simulation, and in particular relates to a receiver mixer output response modeling method for calculating the output response characteristics of the receiver mixer in an interference environment. Background technique [0002] When electronic equipment such as radar and communication work in an interference environment, the mixer of the receiver is often in a nonlinear response state, which will generate more interference frequency components and affect the performance of the subsequent circuit. At present, there is no clear nonlinear response model of the receiver mixer, and it is impossible to accurately calculate the output response of the mixer in the interference environment. In order to accurately predict and calculate the nonlinear response characteristics of the receiver mixer in the interference environment, it is necessary to establish a calculation mod...

Claims

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Application Information

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IPC IPC(8): H04B17/00
Inventor 谭辉张凯刘其凤方重华张崎
Owner CHINA SHIP DEV & DESIGN CENT
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