Application Brief Creating SPICE model from ground-up simulation

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Application Brief Creating SPICE model from ground-up simulation

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OrCAD PSPICE Library VIP10High-Speed
Application Brief
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 VIP10process 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, dielectricallyisolated, 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".
RECEIVE PRE-AMP
Barry Yuen
LMH6622 HYBRID COUPLER TELEPHONE LINE
LMH6643
LMH6672
BUFFER/FILTER LINE DRIVER
Figure Block Diagram ADSL Analog Front
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LMH6643 Buffer Amplifier Converter pair LMH6643 used differential buffer amplifier outputs digital-toanalog 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 simply defined -RB1+ RB2+ -RB1- RB2-
+VIN RB1+
ADSL Analog Front Customer Premises Equipment very popular applications high-speed operational amplifiers analog front customer premises equipment side. LMH6643 rail-to-rail output, LMH6672 line driver, LMH6622 low-noise amps form robust chipset solution that maximizes ADSL baseband performance shown Figure
LMH6643 -VIN RB2250 RB12 -Buffer +Buffer
RB2+ LMH6643
+12V
VOFF VAMPL FREQ 130K
Figure LMH6643 Buffer ADSL Analog Front
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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 16.8Vpp 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+/RG) (1+2*RF-/RG). capacitor inserted gain V/V.
+Buffer +12V
1500 1500
LMH6622 +12V
VLMH6622
R2+Tx
Figure LMH6622 Low-noise Pre-amp ADSL Downstream
LMH6672 1200
12.5
+Vload
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.
RF1200 12.5
-Vload
V-Buffer LMH6672 +12V
Figure LMH6672 Differential Driver Differential Load
National Semiconductor 2900 Semiconductor 58090 Santa Clara, 95052 1-800-272-9959 Visit site www.national.com more information, send email newfeedback@nsc.com
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.
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. Additional Information
amplifiers.national.com
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National Semiconductor Corporation, 2002. National Semiconductor registered trademarks VIP10 trademark National Semiconductor Corporation. rights reserved.

Application Brief Creating SPICE model from ground-up simulation

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