OrCAD PSPICE Library VIP10 High-Speed Creating SPICE model from g

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OrCAD PSPICE Library VIP10 High-Speed Creating SPICE model from g

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OrCAD PSPICE Library VIP10 High-Speed
OrCAD PSPICE Library VIP10 High-Speed
Creating SPICE model from ground-up simulation esoteric often time consuming. National Semiconductor Corporation OrCAD Capture library (nationalhighspeed.olb) PSPICE (nationalhighspeed.lib) model library industry-leading VIP10 process high-speed operational amplifiers. These libraries contain behavior models series high-speed operational amplifiers schematic symbols amp. These libraries available download from amplifiers.national.com. Libraries created from OrCAD PSPICE version have been verified match performance datasheet. VIP10 high-speed, dielectrically-isolated, complementary bipolar process that utilizes deep trench technology bonded wafer complete dielectric isolation optimal high-speed amplifier performance. Trench technology with bonded wafers helps minimize parasitic capacitance optimal power-to-bandwidth performance, lower distortion decreased size. When doing simulation, path nationalhighspeed.lib needs added under either "Include Files" option "Libraries" option "Simulation Profile".
National Semiconductor Application Note 1255 Barry Yuen September 2005
20054501
FIGURE Block Diagram ADSL Analog Front
ADSL Analog Front Customer Premises Equipment
very popular applications high-speed operational amplifiers analog front customer premises equipment side. LMH6643 railto-rail output, LMH6672 line driver, LMH6622 low-noise amps form robust chipset solution that maximizes ADSL baseband performance shown Figure
LMH6643 Buffer Amplifier Converter
pair LMH6643 used differential buffer amplifier outputs digital-to-analog converter providing impedance matching, isolation, driving capability optional pass filter between LMH6643 LMH6672.Figure shows OrCAD schematic demonstrate SPICE model. voltage gain this inverting buffer amplifier simlpy defined -RB1+/RB2+ -RB1-/RB2-
AN-1255
2005 National Semiconductor Corporation
AN200545
www.national.com
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LMH6643 Buffer Amplifier Converter (Continued)
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FIGURE LMH6672 Differential Driver Differential Load
FIGURE LMH6643 Buffer ADSL Analog Front
LMH6622 Downstream Low-Noise Pre-Amp
LMH6622 used low-noise pre-amp downstream link because noise low-distortion performance. This twin personality ensures receiving path high dynamic range meet stringent linearity noise requirements ADSL standard. Figure LMH6622 used inverting summing amplifier provide both receive pre-amp channel gain driver echo signal cancellation. order cancel unwanted driver echo signal receive path, 2*R2+ 2*R2-. reality, hybrid rejection about imperfect matching. resistors values simulation adjusted experience real performance receive circuit.
LMH6672 Upstream Line Driver
LMH6672 used upstream line driver because high-output drive with distortion single supply features. When connected differential output driver, LMH6672 drive load 16.8 swing with only distortion fully supports peak upstream power levels full-rate ADSL.Figure typical line driver circuit driving twisted-pair transmission line through transformer. voltage gain this non-inverting driver amplifier simply defined (1+2*RF+/ (1+2*RF-/RG). capacitor inserted gain V/V.
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LMH6622 Downstream Low-Noise Pre-Amp
(Continued)
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FIGURE LMH6622 Low-noise Pre-amp ADSL Downstream Figure shows differential output voltage across twisted-pair-transmission line unwanted echo signal pre-amp's outputs. Perfect cancellation unwanted echo signal possible only perfect matching achieved.
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FIGURE Simulation Results Transmission Line Pre-amp's Output conclusion, PSPICE models Capture symbols National's high-speed amps downloaded from amplifiers.national.com used simulation.
www.national.com
OrCAD PSPICE Library VIP10 High-Speed
Notes
National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications. most current product information visit www.national.com. LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user. BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products uses packing materials that meet provisions Customer Products Stewardship Specification (CSP-9-111C2) Banned Substances Materials Interest Specification (CSP-9-111S2) contain ``Banned Substances'' defined CSP-9-111S2. Leadfree products RoHS compliant. critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness.
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OrCAD PSPICE Library VIP10 High-Speed Creating SPICE model from g

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