LOGARITHMIC AMPLIFIER, ANTI LOG AMPLIFIER , COMPARATOR

1. EE8451
LINEAR
INTEGRATED
CIRCUITS & ITS
APLLICATIONS
Mr. C. KARTHIKEYAN ,
ASSISTANT PROFESSOR,
ECE,RMKCET

2. UNIT 3 APPLICATIONS OF OPERATIONAL
AMPLIFIERS
 Instrumentation amplifier,
 Log and Antilog Amplifiers,
 first and second order active
filters,
 comparators,
 multivibrators,
 waveform generators,
 clippers, clampers,
 peak detector,
 S/H circuit, D/A converter (R- 2R
ladder and weighted resistor
types),
 A/D converters using op-amps
Mr. C. KARTHIKEYAN ,
ASSISTANT PROFESSOR,
ECE,RMKCET

3. LOGARITHMIC AMPLIFIER

4. EXAMPLE 1

5. EXAMPLE 2

8. CIRCUIT DIAGRAM LOG AMPLIFIER USING
DIODE & OP AMP
DIODE CURRENT EQUATION

9. DIODE CURRENT EQUATION

10. CIRCUIT DIAGRAM LOG AMPLIFIER USING
TRANSISTOR & OP AMP

13. OUTPUT VOLTAGE INDEPENDENT OF Is

14. + of DIFFERENTIAL AMPLIFIER

15. TEMPERATURE COMPENSATION CIRCUIT

16. COMPARE NON INVERTING AMPLIFIER WITH TEMPERATURE
COMPENSATION CIRCUIT

17. LOG AMPLIFIER

18. ANTI LOG AMPLIFIER

20. COMPARATOR

21. COMPARATOR-Compares two inputs and
gives an output
2 MODES: 1. CLOSED LOOP (with feedback) –TR: ACTIVE REGION .
LINEAR APPLICATIONS – eg: + , -, V-I, I-V
2. OPEN LOOOP (without feedback) –TR: SATURATION REGION
NON -LINEAR APPLICATIONS – eg: COMPARATOR , CLIPPER ,CLAMPER

22. Thanks!