17-07-2012, 04:32 PM
NEGATIVE FEEDBACK AMPLIFIERS INSTRUMENTATION AMPLIFIERS
NEGATIVE FEEDBACK AMPLIFIERS INSTRUMENTATION AMPLIFIERS.docx (Size: 735.62 KB / Downloads: 29)
AIM:
The goal of this experiment is to understand the application of the negative feedback in designing
amplifiers and to build an instrumentation amplifiers.
THEORY:
An Op-Amp can be used in negative feedback mode to build unity gain amplifiers, non-inverting amplifiers and inverting amplifiers. While an ideal Op-Amp is assumed to have infinite gain and bandwidth, real Op-Amps have finite numbers for these parameters. An Op-Amp may be considered as a Voltage Controlled Voltage Source (VCVS) with the voltage gain tending toward, or a Current Controlled Current Source (CCCS) with current gain tending toward. For finite output voltage, the input voltage is practically zero. This is the basic theory of Op-Amp in the negative feedback configuration.
RESULTS:
1. Unit Gain Amplifier, Inverting Amplifier and Non- Inverting Amplifier is designed.
2. DC characteristics and Frequency Response of the entire above circuits are plotted and we tabulated for different values of frequency and we obtained magnitude variation and phase variation.
3. We also designed Instrumentation Amplifier and we have plotted the DC characteristics and Transient Response.