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2014-10-10
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ABSTRACTI
µÚ1ÕÂ ÒýÑÔ1
1.1 ±³¾°1
1.2 Ñо¿ÄÚÈÝ2
µÚ2Õ ϵͳÉè¼ÆµÄ×ÜÌå·½°¸3
2.1 ϵͳÉè¼ÆÄ¿±ê3
2.2 ϵͳÉè¼Æ¿òͼ3
2.3 ϵͳÉè¼Æ˼·3
µÚ3Õ Ӳ¼þµç·Éè¼ÆÓëʵÏÖ4
3.1 Éè¼Æ¸ÅÊö4
3.2 ÎÈѹµçÔ´µÄÖÆ×÷4
3.2.1 µç·¿òͼ5
3.2.2 Ö÷ÒªÓ²¼þ½éÉÜ5
3.2.3 ÔÀíͼÉè¼Æ6
3.3 µ¥Æ¬»ú¿ØÖƵç·7
3.3.1 D/Aת»»µç·9
3.3.2 ÏÔʾµç·11
3.3.3 Ó²¼þÉè¼Æ¡¢·ÂÕæ14
3.3.4 Ó²¼þʵÏÖÓëµ÷ÊÔ15
3.4 AD603·Å´óµç·16
3.4.1 AD603½éÉÜ16
3.4.2 Ó²¼þÉè¼ÆÓëʵÏÖ17
3.5 AD826·Å´óµç·19
3.5.1 AD826½éÉÜ19
3.5.2 Ó²¼þÉè¼ÆÓëʵÏÖ19
µÚ4Õ ӡÖƵç·°åµÄÉè¼Æ21
4.1 Éè¼Æµç·ÔÀíͼ21
4.2 ²úÉúÍøÂç±í22
4.3 Ó¡ÖƵç·°åµÄÉè¼Æ23
µÚ5Õ ½áÊøÓï25
ÖÂл26
²Î¿¼ÎÄÏ×27
¸½Â¼A Ôª¼þÁбí28
¸½Â¼B PCBͼ29
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ABSTRACT
Broadband amplifier used in telecommunications, broadcasting, radar, television, automatic control and other devices, has develop rapidly, and their increasingly requirements lie not only on output stability, and wide bandwidth, but also the best gain control. This article puts forward the design and realization of the circuit.
This paper introduces a variable gain broadband amplifier using AD603, which can simultaneously achieve wide bandwidth and high gain requirements. AT89S51 MCU as the core to achieve wide bandwidth and high gain to control the analog amplification becomes reality. After completing the design of the circuit, the paper verifies the correctness of the design though some simulations such as Proteus for MCU module and Multisim for amplification module. The paper also introduces the hardware design using general boards and the schematic and PCB design using Protel 99 SE.
Keywords£ºAT89S52, Wideband amplifier, Variable gain.