AIC_Lab5 - EEE 591 Analog Integrated Circuits Laboratory...

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EEE 591 Analog Integrated Circuits Laboratory Lab 5 Design of Automatic Gain Control Circuit Submitted by Saurabh Naik ASU ID: 1201916850 Date: 11/17/2009
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Abstract: In the early years of radio circuits, fading (defined as slow variations in the amplitude of the received signals) required continuing adjustments in the receiver’s gain in order to maintain a relative constant output signal. Such situation led to the design of circuits, which primary ideal function was to maintain a constant signal level at the output, regardless of the signal’s variations at the input of the system. Originally, those circuits were described as automatic volume control circuits, a few years later they were generalized under the name of Automatic Gain Control (AGC) circuits. With the huge development of communication systems during the second half of the 20 th century, the need for selectivity and good control of the output signal’s level became a fundamental issue in the design of any communication system. Nowadays, AGC circuits can be found in any device or system where wide amplitude variations in the output signal could lead to a lost of information or to an unacceptable performance of the system. Objective: Design Automatic Gain Control (AGC) with two stage Differential CMOS Amplifier to meet the following design criteria’s: Input and output DC Q @ 1.25V Max output Swing: 1.0 V Open Loop Gain > 50dB Find the proper feedback resistors to get 20dB 15dB 10dB 5dB voltage gain. Device Parameters: m process Voltage supply: V dd = 2.5 V Circuit Diagram:
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Analysis: Now, we have to design the automatic gain control circuit for four different voltage gains. i.e. 5dB, 10dB,
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This note was uploaded on 11/28/2009 for the course EE 591 taught by Professor Kiaei during the Fall '09 term at University of Arizona- Tucson.

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AIC_Lab5 - EEE 591 Analog Integrated Circuits Laboratory...

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