http://www.ee.iitm.ac.in/vlsi/ 2026-04-04T19:23:08+00:00 http://www.ee.iitm.ac.in/vlsi/ http://www.ee.iitm.ac.in/vlsi/lib/tpl/zenlike/images/favicon.ico text/html 2016-01-11T09:26:29+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ee3703_2016/activercfilter?rev=1452504389&do=diff Goals * Understand the operation of an active RC (i.e. opamp-RC) filter Lecture * Brief introductory lecture about this experiment References * Analog Circuits Course lectures on VLSI group videolectures * Synthesis of a second order active-RC filter with bandpass and low-pass outputs. * Synthesis of a biquad with arbitrary numerator, the effect of finite input and output impedance of opamps in feedback amplifiers. text/html 2016-01-11T09:26:29+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ee3703_2016/chargepump?rev=1452504389&do=diff Goals * Design a negative voltage generator from a positive supply. * Design a circuit to get a higher voltage than the available supply Preliminaries * Analyze the circuit in the figure above. Determine the waveforms VA and VB in steady state. This requires a careful evaluation of the region of operation of the MOS transistors. text/html 2016-01-11T09:26:29+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ee3703_2016/doublebalancedmixer?rev=1452504389&do=diff Goals * Understand the operation of a double balanced mixer * The above figure shows the mixer designed in the previous experiment. Ideally a mixer fed with VRF and VLO should have only product of these two components at the output. i.e the output should be zero if either of VRF or VLO is zero. But, as seen earlier, with VRF=0, the above mixer still generates an output proportional to VLO(LO feedthrough). Such a mixer is known as a single balanced mixer. text/html 2016-02-13T12:13:21+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ee3703_2016/gmcfilter?rev=1455365601&do=diff Goals * Understand how to realize filters using transconductors and capacitors Preliminaries * The circuit above shows an inverter self biased using a resistor Rbias. An ac signal vs is coupled to the input and the output is incrementally shorted for ac signals. What is iout? What will you do to make iout/vs approximately equal to the gm of the inverter and independent of Rbias? Read the description of the experiment below and see where the self biased inverter fits in. text/html 2016-01-11T09:26:29+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ee3703_2016/invchar?rev=1452504389&do=diff Goals * You'll be using inverters in a CD4069 CMOS inverter chip as transconductors(VCCS). In this experiment you'll measure the large and small signal characteristics of this transconductor. In all experiments, remember to disable the unused inverters. Do all steps for Vdd=6V for the inverter unless otherwise specified. Choose the supply voltages Vcc and Vee of the opamp appropriately. * Determine the large signal Iout versus Vin * Determine the large signal Vout versus Vin * Det… text/html 2016-01-11T09:26:29+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ee3703_2016/mixer?rev=1452504389&do=diff Goals * Understand the operation of a mixer used for frequency conversion * Design and build a single balanced mixer Principle * A mixer is used for frequency conversion. For example, it is used in radio receivers to convert incoming signals at a high frequency to a lower intermediate frequency. And, in transmitters, it is used to convert low frequencies such as voice to high carrier frequencies. * A linear time invariant network cannot generate new frequencies. For frequency conversi… text/html 2016-01-11T09:26:29+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ee3703_2016/multistagecomp?rev=1452504389&do=diff Goals * Realize high gain accuracy in a feedback amplifier * Preserve stability while doing so References * Revisit problems 1 to 7 of this problem set from EE3002: Analog Circuits Notes * Use a 6V supply for this experiment. You'll need the gm value measured in the previous experiment. * Connect inputs of unused inverters to ground text/html 2016-01-11T09:26:29+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ee3703_2016/oscillator?rev=1452504389&do=diff Goals * Understand the operation of a schmitt trigger based oscillator * Design a variable frequency oscillator based on this architecture Principle * An oscillator can be constructed using an integrator and a schmitt trigger in a feedback loop such that when the output of the integrator crosses the threshold of the schmitt trigger, the direction of integration is reversed. There are many oscillator topologies based on this principle and in this experiment you'll study one of them. text/html 2016-01-11T09:26:29+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ee3703_2016/phasemargin?rev=1452504389&do=diff * Goals: * Understand the effects of extra phase shifts in a feedback loop * Learn a technique to squeeze out more bandwidth in a feedback amplifier * Design the amplifier in (a) for a gain of -10. What is the expected 3dB bandwidth? Measure the bandwidth by sweeping the input sinewave frequency. Is there peaking(gain at some frequency higher than the dc gain) in the frequency response? What is the bandwidth? Measure the step response by applying a low frequency square wave. Is ther… text/html 2016-01-11T09:26:29+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ee3703_2016/pwmamp?rev=1452504389&do=diff * Goals: Understand the basic operation of a pulse width modulator. * Principle: In conventional amplifiers, the output voltage is proportional to the input voltage. In a pulse width modulator, the output duty cycle is proportional to the input voltage. A switch operated from the pulse width modulator has its average output proportional to the input. Since a switch has no power loss in theory(I=0 for an open switch and V=0 for a shorted switch, resulting in VI=0 under all conditions), and ver… text/html 2016-01-11T09:26:29+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ee3703_2016/regulator?rev=1452504389&do=diff Goals * Design a voltage regulator for positive voltages * Understand efficiency and regulation of a regulator * Appreciate some fine points of small signal “ground” * Understand how to compensate errors due to opamp input bias currents text/html 2019-02-11T16:14:32+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ee3703_2016/spectrumanalyzer?rev=1549901672&do=diff Description A spectrum analyzer is useful for measuring the frequency content of a signal. If an oscilloscope plots v(t) versus t, a spectrum analyzer plots Sv(f) versus f where Sv(f) is the spectral density of v(t). In this project you'll build a simple spectrum analyzer. All the building blocks are familiar to you from previous experiments. text/html 2016-01-11T09:42:19+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ee3703_2016/start?rev=1452505339&do=diff Coordinators * Nagendra Krishnapura * Shanthi Pavan Schedule * P slot(Mondays, 2-445pm) in the IE lab. The lab will be kept open on Saturdays from 9am to 12pm and 2pm to 5pm for you to assemble/debug your circuits. Teaching assistants Contact them from your moodle page