In Today’s Digital World, The Relevance Of Analog Design Appears To Be Secondary To Many People. We Should Not Be Debating Over Which Is Good, The Analog Or The Digital? The Circuit Functions That Can Be Realized In Analog Domain In An Efficient Manner Should Be Done In An Analog Way And Vice-Versa. It Is Felt That Analog Will Remain To Be Favorable For Low Resolutions And/Or Massive Parallel Signal Processing, Such As Required In Optical Sensor Arrays, And For A/D And D/A Converters, Of Course. The Main Aim Of This Work Is The Research On Novel Analog Circuit Techniques Capable Of Being Compatible With Future Digital Standards. Low-Voltage/Low-Power Being Major Criteria, We Choose The Basic Ingredients Such As The CMOS Technology, Use Of Current-Mode Approach (Including Use Of Current Conveyor), And Use Of Static And Dynamic Translinear Principles To Build Analog Systems. The Use Of CMOS Current Conveyor In Conjunction With Diode (Implemented In CMOS Technology) And Capacitor Allows Us To Build Static And Dynamic Translinear Circuits Which Can Operate In Low-Voltage/Low-Power Domain And Also Gives Us Advantages In Terms Of Speed Of Operation. Based On These, Specific Design Methodology Along With Its Applications Such As The Design Of Translinear Filters, Hearing-Aid Filters, And RMS-To-DC Converters Have Been Presented. The Main Thrust Of This Work Is On Novel Analog Circuit Techniques That Employ Ccs, Capacitors And One-Port Devices Like Diodes (Unlike Resistors) To Implement Both Linear And Non-Linear, Static And Dynamic Transfer Functions In Low Cost Silicon CMOS Technology To Achieve Higher Frequency Of Operation Under Lowvoltage Low-Power Conditions. A New Translinear Element “Split-Gate MOS Transistor (SGMOST)” Has Been Proposed. This Would Have The Similar Applications As The Existing Multiple Input Floating Gate Translinear Element And Yet Would Not Need Any Pre-Charging Circuits, As No Floating Gates Are Involved. The Modeling Of This Device, Along With Its Applications Has Also Been Presented. Using A 0.8 Micron CMOS Technology A SGMOST Has Been Fabricated And Tested.
Thesis Submitted In Partial Fulfillment Of The Requirements For The Degree Of Doctor Of Philosophy In Engineering By Debashis Dutta Department Of Electronics And Electrical Communication Engineering Indian Institute Of Technology, Kharagpur West Bengal-721302, India May 2007 Supervisor Professor Swapna Banerjee And Cosupervisor Dr. UP Phadke