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1 Topic 6: Filters: E-Syn, Momentum, Transient and the DAC ADS 2001 Fundamentals - Sept, 2001Slide 6-1
2 Using the E-Syn tool What does E-Syn do? It makes it easy to create FILTERS and Matching Networks. E-Syn user interface is a little different than the ADS interface. Also, you could use a Filter Design Guide instead of E-Syn. This may appear in future releases of ADS! You specify the TYPE of design, the RESPONSE, and the BAND. SYNTHESIZE the design and you get a selection of topologies and values. ANALYZE the design and plot the response in the ADS data display. Optimize if desired. ADS 2001 Fundamentals - Sept, 2001Slide 6-2
3 Using Momentum MOM engine gives S-parameter results What is Momentum? E-M (electro-magnetic) solver using Method of Moments technique and Green s functions to compute the current in planar structures, including vias and the coupling between surfaces. Why use Momentum? You have no accurate model for a passive layout. You want to know the coupling effects between structures. You want to optimize the layout real-estate, performance, etc. Your other structure simulator takes too long to simulate! You want to use the results in ADS simulations. Antenna patterns! Example spiral meshed as a strip geometry. Hole in ground plane is meshed as a slot, which is more efficient than meshing the entire ground plane. ADS 2001 Fundamentals - Sept, 2001Slide 6-3
4 Transient simulation Analysis performed in the Time Domain Use any Source Solutions use Newton_Raphson iterations You get Amplitude vs. Time Time Domain data can be transformed: FS NOTE on Convolution: Frequency domain models (microstrip) can be brought into the time domain and converted to the time domain - then convolved with the time-domain input signal to obtain the time-domain output signal. The convolution tab in the transient simulator allows you to define methods and settings. ADS 2001 Fundamentals - Sept, 2001Slide 6-4
5 Transient simulation controller Integration: step control & error (default:fixed) Time Step is critical! Ignored if no TL s ADS 2001 Fundamentals - Sept, 2001Slide 6-5
6 Setting the Transient Time Step Start time: sampling begins Stop time: sampling ends Time step: sampling rate 2 x BW Use the Nyquist rule: Sample at 2 x or more the rate of the highest frequency of interest: To sample the fundamental (1900 MHz) plus harmonics, you must 2 x (rate of highest harmonic desired). 1 / (2 x 15 x 1900MHz) = picoseconds. ADS 2001 Fundamentals - Sept, 2001Slide 6-6
7 Setting the Transient Stop Time For many circuits: stop time should allow for periodic - settling. Dataset Start Time Stop Time NOTE: Transient analysis can be tricky. Sampling before a circuit reaches steady state will not give correct results when transformed into the frequency domain. Also, you must use a time step that is a multiple of the frequencies of interest or the results will not be correct. ADS 2001 Fundamentals - Sept, 2001Slide 6-7
8 Using a DAC (data access component) For optimization, R1 is assigned to a file which is read by the DAC. res_std.dscr contains an index and a list of values (r_val). In the DAC, variable ival1 is enabled over the range of indexed values beginning with ivar1 which is the first index point in the file. NOTE: ivar1 always = 1 (index at first column). However, ival1 always starts at 0 (same as ADS data). The file must be in the DATA directory and must be in correct format. The circuit simulation manual has information on file formats such as DSCR.. ADS 2001 Fundamentals - Sept, 2001Slide 6-8
9 DAC Optimization: setup and results Save values = no. Only the MeasEqn is sent to the dataset with the final ival1 which is 0 = 56 ohms which gives the least reflection. Also, click Simulate > Update Optimization Values to update the ival in the DAC. ADS 2001 Fundamentals - Sept, 2001Slide 6-9
10 EXTRA INFORMATION: Transient TDR Setup After the class, you can use this slide as a reference if you need it! Find mismatches in time / distance TLIN is 360 degrees at 1 GHz = known time-domain response used as a reference. DUT ADS 2001 Fundamentals - Sept, 2001Slide 6-10
11 Transient TDR Data Display results... After the class, you can use this slide as a reference if you need it! Results: mismatch delay time rho BW VSWR mtrs to mils ADS 2001 Fundamentals - Sept, 2001Slide 6-11
12 EXTRA INFORMATION: LineCalc and Model Composer After the class, you can use this slide as a reference if you need it! LineCalc is still available! Define the substrate Enter L & W to get electrical Enter electrical to get L & W ALSO - New add-on for ADS 1.5: MODEL COMPOSER. Generate your own passive library models (parameterized) for simulation. You get circuit simulation speed with EM simulation accuracy (Momentum) for microstrip components - more types in the future! ADS 2001 Fundamentals - Sept, 2001Slide 6-12
13 What the lab is about... Lab 6: Filters: E-Syn, Momentum, Transient Simulation and the DAC ADS 2001 Fundamentals - Sept, 2001Slide 6-13
14 Steps in the Design Process You are here: Design the rf_sys behavioral model receiver Test conversion, budget gain, spectrum, etc. Start amp_1900 design subckt parasitics Simulate amp DC conditions & bias network Simulate amp AC response - verify gain Test amp noise contributions tune parameters Simulate amp S-parameter response Define amp matching topology and tune input Optimize the amp in & out matching networks Filter design lumped 200MHz LPF - use E-Syn Filter design microstrip 1900 MHz BPF Transient and Momentum filter analysis Amp spectrum, delivered power, Zin - HB Test amp comp, distortion, two-tone, TOI CE basics for spectrum and baseband CE for amp_1900 with GSM source Replace amp and filters in rf_sys receiver Test conversion gain, NF, swept LO power Final CDMA system test CE with fancy DDS Co-simulation of behavioral system ADS 2001 Fundamentals - Sept, 2001Slide 6-14
15 Use E-Syn for filter design: 200 MHz LPF E-Syn main window Step 1: Start E-Syn in the ADS schematic window, click: Tools > Start E-Syn Step 2: Set the Frequency range Specification and click: Select Type. ADS 2001 Fundamentals - Sept, 2001Slide 6-15
16 E-Syn MHz LPF (continued) Step 3: Select the design: Type, Response, and Band. Step 4: Go back to E-Syn main menu and click the Synthesis icon: At first, window will be blank. Therefore, click the Synthesize button to calculate topology & component values as shown here. Main window will report status. ADS 2001 Fundamentals - Sept, 2001Slide 6-16
17 E-Syn MHz LPF simulation results Step 5: Select the Network you want to use and then click Analysis. Step 6: Set up the simulation and Analyze. The results will appear in the ADS Data Display window. Result of design (Butterworth) to be used in Final simulation. ADS 2001 Fundamentals - Sept, 2001Slide 6-17
18 Create a Microstrip BP Filter: 1900 MHz Microstrip coupled line filter with substrate and VtSine source. This filter will be used on the input to the RF system. It will also be used to show the value of ADS Momentum. ADS 2001 Fundamentals - Sept, 2001Slide 6-18
19 Generate the Layout of 1900 MHz BPF Remove controllers and Terms - insert Port connectors Use MOM menus... ADS 2001 Fundamentals - Sept, 2001Slide 6-19
20 Set up Momentum: substrate, mesh, simulation Compare to circuit S21: ADS 2001 Fundamentals - Sept, 2001Slide 6-20
21 Use MOM to display coupling effects Use the same layout but add a rectangle alongside the filter: Coupled Line Filter draw a trace in close proximity Momentum simulation shows resonance from coupling. ADS 2001 Fundamentals - Sept, 2001Slide 6-21
22 Transient simulation of 1900 MHz BPF Microstrip coupled line filter with substrate and VtSine source. Stop time after 15 periods and step using Nyquist for 15 harmonics. Transient results show input vs output waveforms: Write an equation using markers and the indep function to calculate delay: ADS 2001 Fundamentals - Sept, 2001Slide 6-22
23 OPTIONAL - DAC exercise Write the file Start the lab now! After S-parameter simulation to calculate Z, plot the results. ADS 2001 Fundamentals - Sept, 2001Slide 6-23
24 易迪拓培训 专注于微波 射频 天线设计人才的培养网址 : A D S 视频培训课程推荐 ADS Advanced Design System 是由原美国安捷伦科技 ( 现更名为是德科技 ) 推出的微波射频电路 通信系统和 MMIC/RFIC 仿真设计软件, 其功能强大 应用广泛, 被国内高校 科研院所和大型科技公司使用广为使用 掌握 ADS 无疑能提升相关设计领域工程师的技术实力 提高工作效率 为了帮助工程技术人员更好 更快的学习掌握 ADS 的使用, 易迪拓培训 ( 特聘多年 ADS 使用经验的资深专家精心制作推出了多套 ADS 视频培训课程, 由浅入深 全面系统地讲授了 ADS 在微波射频电路设计 通信系统设计和电磁仿真设计方面的仿真设计和应用操作 其中, 视频课程多以设计实例边操作边讲解, 工程实践强, 且直观易学, 能够帮助您在最短的时间内学会使用 ADS, 并把 ADS 真正应用到设计研发工作中去... ADS 学习培训课程套装该套装是易迪拓培训和微波 EDA 网联合推出的迄今为止国内最全面 最权威的 ADS 培训教程, 共包含 10 门 ADS 学习培训课程 课程是由具有多年 ADS 使用经验的微波射频与通信系统设计领域资深专家讲解, 并多结合设计实例, 由浅入深 详细而又全面地讲解了 ADS 在微波射频电路设计 通信系统设计和电磁仿真设计方面的内容 能让您在最短的时间内学会使用 ADS, 迅速提升个人技术能力, 把 ADS 真正应用到实际研发工作中去, 成为 ADS 设计专家... 课程网址 : 更多 ADS 视频培训课程 : 两周学会 ADS 中文视频培训教程最新版 ADS 的入门和进阶培训课程, 适合 ADS2011 ~ ADS2014 以及更新版本 ADS 的学习 是 ADS 初学者的最佳课程, 网址 : ADS 射频模拟电路设计详解 中文视频教程本课程基于新版的 ADS 软件, 由李明洋老师讲授, 讲解了 ADS 在微波射频模拟电路设计中的具体应用, 视频课程, 直观易学, 网址 : ADS 高低阻抗线微带滤波器设计 (ADS2014 版 ) 中文视频教程该门课程旨在帮助学员快速 全面 透彻地理解高低阻抗线微带滤波器的设计原理和设计步骤, 帮助学员学会并掌握使用 ADS 软件仿真分析和优化设计微带线滤波器的实际操作 ; 课程网址 : 更多 ADS 培训课程, 敬请浏览 :
25 ` 专注于微波 射频 天线设计人才的培养易迪拓培训网址 : 关于易迪拓培训 : 易迪拓培训 ( 由数名来自于研发第一线的资深工程师发起成立, 一直致力和专注于微波 射频 天线设计研发人才的培养 ; 后于 2006 年整合合并微波 EDA 网 ( 现已发展成为国内最大的微波射频和天线设计人才培养基地, 成功推出多套微波射频以及天线设计相关培训课程和 ADS HFSS 等专业软件使用培训课程, 广受客户好评 ; 并先后与人民邮电出版社 电子工业出版社合作出版了多本专业图书, 帮助数万名工程师提升了专业技术能力 客户遍布中兴通讯 研通高频 埃威航电 国人通信等多家国内知名公司, 以及台湾工业技术研究院 永业科技 全一电子等多家台湾地区企业 我们的课程优势 : 成立于 2004 年,10 多年丰富的行业经验 一直专注于微波射频和天线设计工程师的培养, 更了解该行业对人才的要求 视频课程 既能达到现场培训的效果, 又能免除您舟车劳顿的辛苦, 学习工作两不误 经验丰富的一线资深工程师讲授, 结合实际工程案例, 直观 实用 易学 联系我们 : 易迪拓培训官网 : 微波 EDA 网 : 官方淘宝店 : 专注于微波 射频 天线设计人才的培养易迪拓培训官方网址 : 淘宝网店 :
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