A new CMOS differential current-mode AGC on the division operation based |
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| Affiliation: | 1. Computer Science and Information Department, Community College, Taibah University, Al-Madinah Al-Munawwarah 2898, Saudi Arabia;2. Computer and System Section, Electrical Engineering Department, Faculty of Engineering, Aswan University, Aswan 81542, Egypt;1. School of Computing and Electrical Engineering, Indian Institute of Technology (IIT) Mandi, Mandi, Himachal Pradesh 175001, India.;2. Electronics and Communication Engineering, Indian Institute of Technology (IIT) Roorkee, Roorkee, Uttarakhand, India.;1. Council for Scientific and Industrial Research, Meiring Naudé Road, Brummeria, Pretoria 0184, South Africa;2. Carl and Emily Fuchs Institute for Microelectronics, Dept. of Electrical, Electronic and Computer Engineering, University of Pretoria, Cnr Lynnwood and University Roads, Pretoria 0002, South Africa;3. Faculty of Engineering and the Built Environment, University of Johannesburg, Auckland Park Kingsway Campus, Auckland Park 2006, South Africa |
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| Abstract: | A new CMOS differential current-mode AGC on the division operation based is presented. The operation principle consists in detection of both positive and negative envelopes of the differential input signal cycles, respectively. The output signal with constant magnitude is obtained by dividing the differential input signal to the difference between the positive and negative detected envelopes. The new current-mode architecture of the proposed AGC (composed only by an envelope detector and a divider stage) diminishes significantly the settling time, the circuit complexity and the power consumption. The circuit yields an input dynamic range of 15 dB and provides a constant magnitude output signal in the frequency range from 10 MHz to 70 MHz. The current consumption is 5 mA from a single 3.3 V supply voltage. The simulations performed in 0.13 µm CMOS process confirm the theoretically obtained results. |
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| Keywords: | Automatic gain control CMOS process Current-mode divider Envelope detectors |
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