Version 4 SHEET 1 2444 1116 WIRE 464 64 448 64 WIRE 592 64 464 64 WIRE 464 144 464 64 WIRE 496 144 464 144 WIRE 48 160 48 128 WIRE 672 160 672 64 WIRE 672 160 560 160 WIRE 720 160 672 160 WIRE 800 160 720 160 WIRE 304 176 256 176 WIRE 496 176 304 176 WIRE 48 272 48 240 WIRE 48 272 -16 272 WIRE 48 304 48 272 WIRE 48 416 48 384 WIRE 464 464 448 464 WIRE 592 464 464 464 WIRE 464 544 464 464 WIRE 496 544 464 544 WIRE 672 560 672 464 WIRE 672 560 560 560 WIRE 720 560 672 560 WIRE 800 560 720 560 WIRE 256 576 256 176 WIRE 496 576 256 576 WIRE 256 624 256 576 WIRE 256 752 256 704 FLAG -16 272 0 FLAG 48 128 Vcc FLAG 48 416 Vee FLAG 528 128 Vcc FLAG 528 192 Vee FLAG 368 64 0 FLAG 256 752 0 FLAG 528 528 Vcc FLAG 528 592 Vee FLAG 720 640 0 FLAG 720 240 0 FLAG 368 464 0 FLAG 800 160 VFB FLAG 800 560 CFB FLAG 304 176 input SYMBOL voltage 48 144 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 10 SYMBOL voltage 48 288 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value 10 SYMBOL res 464 48 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R1 SYMATTR Value 1k SYMBOL res 688 48 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R2 SYMATTR Value 1k SYMBOL res 688 448 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R4 SYMATTR Value 1k SYMBOL paramVFBopamp 528 160 R0 SYMATTR InstName U1 SYMATTR Value2 30MegHz SYMBOL Misc\\signal 256 608 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V4 SYMATTR Value PULSE(-1 1 1n 1n 1n 500n 1u) SYMBOL res 704 544 R0 SYMATTR InstName R3 SYMATTR Value 100 SYMBOL res 704 144 R0 SYMATTR InstName R5 SYMATTR Value 1k SYMBOL res 464 448 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R6 SYMATTR Value 1k SYMBOL paramCFBopamp 528 560 R0 SYMATTR InstName U2 SYMATTR Value2 30MegHz TEXT -40 776 Left 0 !.tran 1.5u TEXT 704 112 Left 0 ;voltage feedback opamp TEXT 704 512 Left 0 ;current feedback opamp TEXT 1024 648 Left 0 ;* The model parameters are self explaining, except:\n* slew: slew rate limit [V/s], relative to GBW parameter.\n* fmargin: corner frequency of high order poles [Hz], relative to GBW. \n* Rfb: specified feedback resistor for which the other CFB parameters are valid.\n* Rinv and Linv: resistance and inductance of CFB inverting input. TEXT 1024 240 Left 0 ;* The open loop DCgain and GBW parameters of the current feedback opamp are \n* specified for the combination of the opamp and its feedback resistor Rfb \n* in series with its inverting input. This convention makes these parameters \n* equivalent and comparable to voltage feedback opamp parameters.\n* To derive DCgain and GBW from CFB opamp datasheets: divide the \n* published open loop DC transresistance by the specified Rfb to\n* obtain DCgain, and divide the open loop transimpedance-frequency product\n* as seen in typical curves by the specified Rfb to obtain GBW. \n* Note that for wideband opamps (both VFB and CFB) the unity gain bandwidth\n* is much higher than the GBW due to high Q closed loop poles. For example\n* an opamp with 1GHz unity gain bandwidth might have a GBW of only 300MHz. TEXT 1024 -32 Left 0 ;* Simple parametrized opamp models for general purpose simulations.\n* The most important transient and AC properties are included.\n* DC precision (offset, bias, ...) is not modelled.\n* All frequency dependent behavior is linked to the GBW (Gain BandWidth\n* product) parameter, so that GBW can be used to scale the whole opamp.