CCMI RN2>>RN1 本 RIN FIGURE 27.5 A SPICE circuits-appi A comparison of the SPICE macromodels with actual manufacturers data for the case of an LM318 op amp is demonstrated in Fig. 27.6, for the open-loop gain versus frequency specification Defining Terms Boyle macromodel: A SPICE computer model for an op amp. Developed by G R. Boyle in 1974 Equivalent noise current(END): A noise current source that is effectively in parallel with either the nonin- verting input terminal (ENI*)or the inverting input terminal(ENI-)and represents the total noise contributed by the op amp if either input terminal is open circuited quivalent noise voltage(ENV): A noise voltage source that is effectively in series with either the inverting or noninverting input terminal of the op amp and represents the total noise contributed by the op amp if the inputs were shorted. Ideal operational amplifier: An op amp having infinite gain from input to output, with infinite input resistance and zero output resistance and insensitive to the frequency of the signal. An ideal op amp is useful in first-order analysis of circuits Operational amplifier(op amp): a dc amplifier having both an inverting and noninverting input and rmally one output, with a very large gain from input to output. SPICE: A computer simulation program developed by the University of California, Berkeley, in 1975. Versions are available from several companies. The program is particularly advantageous for electronic circuit analysis, since dc, ac, transient, noise, and statistical analysis is possible Related Topic 13. 1 Analog Circuit Simulation e 2000 by CRC Press LLC© 2000 by CRC Press LLC A comparison of the SPICE macromodels with actual manufacturer’s data for the case of an LM318 op amp is demonstrated in Fig. 27.6, for the open-loop gain versus frequency specification. Defining Terms Boyle macromodel: A SPICE computer model for an op amp. Developed by G.R. Boyle in 1974. Equivalent noise current (ENI): A noise current source that is effectively in parallel with either the nonin￾verting input terminal (ENI+) or the inverting input terminal (ENI–) and represents the total noise contributed by the op amp if either input terminal is open circuited. Equivalent noise voltage (ENV): A noise voltage source that is effectively in series with either the inverting or noninverting input terminal of the op amp and represents the total noise contributed by the op amp if the inputs were shorted. Ideal operational amplifier: An op amp having infinite gain from input to output, with infinite input resistance and zero output resistance and insensitive to the frequency of the signal. An ideal op amp is useful in first-order analysis of circuits. Operational amplifier (op amp): A dc amplifier having both an inverting and noninverting input and normally one output, with a very large gain from input to output. SPICE: A computer simulation program developed by the University of California, Berkeley, in 1975.Versions are available from several companies. The program is particularly advantageous for electronic circuit analysis, since dc, ac, transient, noise, and statistical analysis is possible. Related Topic 13.1 Analog Circuit Simulation FIGURE 27.5 A SPICE circuits-approach macromodel. D6 V2 D5 I sc+ I sc– R01 R02 G0 = I/R02 D3 D4 E2 VOUT L0 V1 (7) (13) (14) (17) (18) (3) (+) (–) (Input) (2) (1) (4) (7) (10) (3) (9) (11) (12) (5) (15) (23) (16) (19) (6) (20) (6) (21) (22) Ips Rps VCC Cp4 Rp4 Rp3 Rp2 VN VP DN2 DP2 DN1 ECMRR EPSRR CCMI RCMI CCM2 RCM2 DP1 RN1 CN2 RN2>>RN1 Rp1 Rslew E1=1xV(15) E2=1xV(6) Cp3 Cp2 Cp1 Rz1 G1 G2 G3 G4 D2 D1 VEE VOS I s– I s+ VCC CIN RIN -VEE (4) – + + – + – + – – + – + + + – – + – I slew+ I slew–