OP AMP
INTRODUCTION 1.1
SECTION 1.1: OP AMP OPERATION 1.3
INTRODUCTION 1.3
VOLTAGE FEEDBACK (VFB) MODEL 1.3
BASIC OPERATION 1.4
INVERTING AND NONINVERTING CONFIGURATIONS 1.5
OPEN-LOOP GAIN 1.9
GAIN BANDWIDTH PRODUCT 1.11
STABILITY CRIT
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ERIA 1.11
PHASE MARGIN 1.13
CLOSED-LOOP GAIN 1.13
SIGNAL GAIN 1.14
NOISE GAIN 1.14
LOOP GAIN 1.15
BODE PLOT 1.16
CURRENT FEEDBACK (CFB) MODEL 1.17
DIFFERENCES FROM VFB 1.17
HOW TO CHOOSE BETWEEN VFB AND CFB 1.19
SUPPLY VOLTAGES 1.19
SINGLE-SUPPLY CONSIDERATIONS 1.20
CIRCUIT DESIGN CONSIDERATIONS FOR SINGLE-
SUPPLY SYSTEMS 1.23
RAIL-TO-RAIL 1.25
PHASE REVERSAL 1.25
LOW POWER AND MICROPOWER 1.25
PROCESSES 1.26
EFFECTS OF OVERDRIVE ON OP AMP INPUTS 1.27
SECTION 1.2: OP AMP SPECIFICATIONS 1.29
INTRODUCTION 1.29
DC SPECIFICATIONS 1.30
OPEN-LOOP GAIN 1.30
OPEN-LOOP TRANSRESISTANCE OF A CFB OP AMP 1.32
OFFSET VOLTAGE 1.33
OFFSET VOLTAGE DRIFT 1.33
DRIFT WITH TIME 1.33
SECTION 1.2: OP AMP SPECIFICATIONS (cont.)
CORRECTION FOR OFFSET VOLTAGE 1.34
DigiTrim™ TECHNOLOGY 1.34
EXTERNAL TRIM 1.36
INPUT BIAS CURRENT 1.38
INPUT OFFSET CURRENT 1.38
COMPENSATING FOR BIAS CURRENT 1.39
CALCULATING TOTAL OUTPUT OFFSET ERROR DUE TO
IB AND VOS 1.41
BASIC LINEAR DESIGN
INPUT IMPEDANCE 1.42
INPUT CAPACITANCE 1.43
INPUT COMMON MODE VOLTAGE RANGE 1.43
DIFFERENTIAL INPUT VOLTAGE 1.44
SUPPLY VOLTAGES 1.44
QUIESCENT CURRENT 1.44
OUTPUT VOLTAGE SWING
(OUTPUT VOLTAGE HIGH / OUTPUT VOLTAGE LOW) 1.45
OUTPUT CURRENT (SHORT-CIRCUIT CURRENT) 1.45
AC SPECIFICATIONS 1.47
NOISE 1.47
VOLTAGE NOISE 1.47
NOISE BANDWIDTH 1.48
NOISE FIGURE 1.48
CURRENT NOISE 1.49
TOTAL NOISE (SUM OF NOISE SOURCES) 1.49
1/f NOISE (FLICKER NOISE) 1.51
POPCORN NOISE 1.52
RMS NOISE CONSIDERATIONS 1.53
TOTAL OUTPUT NOISE CALCULATIONS 1.55
DISTORTION 1.60
THD (TOTAL HARMONIC DISTORTION) 1.60
THD + N (TOTAL HARMONIC DISTORTION PLUS NOISE) 1.60
INTERMODULATION DISTORTION 1.61
THIRD+C65 ORDER INTERCEPT POINT (IP3), SECOND
ORDER C56 INTERCEPT POINT (IP2) 1.61
1 dB COMPRESSION POINT 1.63
SNR (SIGNAL TO NOISE RATIO) 1.63
ENOB (EQUIVALENT NUMBER OF BITS) 1.63
OP AMP SPECIFICATIONS (cont.)
SPURIOUS-FREE DYNAMIC RANGE (SFDR) 1.64
SLEW RATE 1.64
FULL POWER BANDWIDTH 1.65
−3 dB SMALL SIGNAL BANDWIDTH 1.66
BANDWIDTH FOR 0.1 dB BANDWIDTH FLATNESS+C65 1.66
GAIN-BANDWIDTH PRODUCT 1.67
CFB FREQUENCY DEPENDANCE 1.68
SETTLING TIME 1.69
RISE TIME AND FALL TIME 1.70
PHASE MARGIN 1.70
CMRR (COMMON-MODE REJECTION RATIO) 1.71
PSRR (POWER SUPPLY REJECTION RATIO) 1.72
DIFFERENTIAL GAIN 1.73
DIFFERENTIAL PHASE 1.75
PHASE REVERSAL 1.75
CHANNEL SEPARATION 1.75
ABSOLUTE MAXIMUM RATING 1.76
REFERENCES 1.79
SECTION 1.3: HOW TO READ DATA SHEETS 1.83
THE FRONT PAGE 1.83
THE SPECIFICATION TABLES 1.83
THE ABSOLUTE MAXIMUMS 1.89
THE ORDERING GUIDE 1.92
THE GRAPHS 1.92
THE MAIN BODY 1.93
SECTION 1.4: CHOOSING AN OP AMP 1.95
STEP 1: DETERMINE THE PARAMETERS 1.96
STEP 2: SELECTING THE PART
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