2011年全国电子设计大赛LC谐振放大器的设计.doc

LC谐振放大器的设计 摘要：本文是基于LC高频小信号放大电路的设计，它由前级衰减电路、LC谐振放大电路、多级增益放大电路、电源电路组成。其中前级衰减电路用π型电阻网络实现40dB的衰减；核心LC谐振放大器采用三极管2SC1815构成的单调谐回路选频放大器，实现15MHz的谐振频率和300KHz的带宽调节，增益放大电路由SGM8067组成的三级同相放大电路实现15MHz带宽60dB放大倍数的放大，整个LC放大电路的带内波动不大于2dB；电路所需的3.6V稳定电压由锂电池18650提供。 本设计很好实现谐振频率15MHz、带宽300KHz、增益76dB以及带内波动小于1dB的谐振放大电路，并且本设计采用高频三极管2SC1815和高速LC谐振；SGM8067Design of the LC resonant amplifier Abstract: This paper is based on LC high frequency amplifier circuit design of small signal, it by the former stage attenuation circuit, LC harmonic oscillator amplifier circuit, multi-level amplifier circuit, the power supply circuit. The top level with π attenuation circuit type resistance network realization of 40 dB attenuation; Core LC resonance with transistor amplifier 2 SC1815 consists of the single tuned circuit choose frequency amplifier, realize the resonance frequency of the 15 MHz of bandwidth and 300 KHz regulation, gain the SGM8067 amplifier circuit of the same phase 3 amplifier circuit realize 15 MHz bandwidth 60 dB magnification magnification, the whole LC amplifier circuit with the fluctuated in not greater than 2 dB; Circuit of 3.6 V voltage stability needed by the lithium battery 18650 provides. This design is very good realize the resonance frequency 15, 300 MHz bandwidth, gain 76 dB KHz and with less than 1 dB fluctuated in resonant amplifying circuit and the design USES high frequency transistor 2 SC1815 and high speed high bandwidth operational amplifier SGM8067 together, LC resonance amplifier circuit, than pure with high frequency transistor composed of multilevel LC resonance amplifier circuit is simple, it is easy to debug.目 录 1 绪论 1 1.1 课题意义与背景 1 1.2高频小信号调谐放大器的原理分析 1 2 系统的整体方案论证与分析 2 2.1 系统设计的功能目标 2 2.2 系统设计方案分析 3 3 硬件电路设计 3 3.1 衰减器的设计 3 3.2 LC谐振电路 5 3.2.1 LC谐振电路的原理 5 3.2.2 LC谐振电路的参数计算 7 3.2.3 LC谐振电路设计 7 3.3 增益放大电路 11 3.3.1 双电源同相比例运算电路 11 3.3.2 单电源运算放大电路 12 3.3.3 SGM8067基本资料 14 3.4 增益放大电路的设计 15 3.5 电源 16 4 电路的仿真与测试 16 4.1 电路基于multisim仿真 16 4.2 系统的测试方案与数据分析 17 4.2.1 测试仪器 17 4