基于GRF-3100射頻系統的混頻器的設計與制作

電子通信論文編號:TX184  論文字數:8375,頁數:23

目　　錄
第一章  引言………………………………………………………………………1
1.1 射頻系統概述……………………………………………………………1
1.2混頻器基本原理………………………………………………………2
1.3混頻器分類……………………………………………………………3
第二章 混頻電路硬件設計……………………………………………………4
2.1主要性能指標…………………………………………………………4
2.2接收機混頻器設計……………………………………………………7
2.2.1電路工作原理………………………………………………7
2.2.2 Protel電路設計…………………………………………8
2.3發射機混頻器設計…………………………………………………11
2.3.1電路工作原理………………………………………………11
2.3.2 Protel電路設計…………………………………………11
第三章 實際電路制作與測試………………………………………………13
3.1 PCB板選材……………………………………………………………13
3.2 電路焊接………………………………………………………………13
3.3 性能測試………………………………………………………………14
3.3.1測試儀器簡介………………………………………………14
3.3.2 測試項目………………………………………………………14
結束語…………………………………………………………………17
主要參考文獻………………………………………………………………18
致謝……………………………………………………………………………19

摘    要
射頻電路實驗系統GRF-3100，工作頻率為800MHz,分為射頻發射和射頻接收兩部分。其中混頻器是實現頻率變換的器件，是射頻系統中的一個關鍵部分。每個無線通信系統都要用到一個以上的混頻器，其性能將直接影響整個系統的性能。混頻器組成模型是相乘器和帶通濾波器，其主要技術指標有混頻增益、隔離度、混附信號、1dB壓縮電平、互調失真，噪聲指數等。本文從整個射頻系統出發，參照射頻電路實驗系統GRF-3100技術手冊，對系統中用到的雙柵極混頻器和晶體管混頻器的設計及其特性進行了獨立的分析和研究，并且介紹了電路設計的整個流程：分析電路原理，電路原理圖及PCB圖設計，實際電路焊接，調試及性能測試。此外，本文對相關的Protel DXP軟件，表面安裝技術(SMT)及頻譜分析儀操作也有所介紹。

關鍵詞：射頻系統；雙柵極混頻；晶體管混頻

Based On RF System GRF-3100 Mixer Design

Abstract
RF circuit GRF-3100 experimental system, the operating frequency of 800MHz，is divided into RF transmitter and RF receiver. Mixer which is the frequency conversion component is a key part of RF system. Each wireless communication systems always use over a mixer. Its performance will directly impact the performance of the whole system. Mixers model is composed of  Multiplier and band-pass filter, and the main technical indicators of mixers are Conversion Gain, Isolation, Spurious Signal, 1dB Compression Level ，Intermodiation Distortion, Noise Figure and so on. The design of Dual Gate Mixer and transistor mixer is investigated and their performances are analyzed, which according to RF circuit experimental system GRF-3100 technical manual. In addition, this paper describes the entire process of the circuit design: circuit analysis, circuit diagram and PCB layout design, the actual circuit welding, debugging and performance testing. Finally, the paper also introduces the relative knowledge of the Protel DXP software, Surface Mounting Technology (SMT) and the spectrum analyzer.

Keywords: radio frequency system; dual gate mixer；transistors mixers