http://www.ee.iitm.ac.in/vlsi/ 2026-04-04T08:04:50+00:00 http://www.ee.iitm.ac.in/vlsi/ http://www.ee.iitm.ac.in/vlsi/lib/tpl/zenlike/images/favicon.ico text/html 2010-12-24T10:35:19+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ec330_2009/activercfilter?rev=1293186919&do=diff * Goals: * Understand the operation of an active RC (i.e. opamp-RC) filter * Use LF347 quad opamp for this experiment * The circuit below can have inputs Vi1,R, Vi1,C, Vi2,R, Vi2,C, Vi3,R and output V1, V2, V3. Determine the transfer functions for all input-output combinations. * Which components do the resonance frequency and the quality factor depend on? * Which components do the zeros depend on? text/html 2010-12-24T10:35:19+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ec330_2009/chargepump?rev=1293186919&do=diff * Goals: * Design a negative voltage generator from a positive supply. * Design a circuit to get a higher voltage than the available supply * Analyze the circuit in the figure above. Determine the waveforms VA and VB in steady state text/html 2010-12-24T10:35:19+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ec330_2009/doublebalancedmixer?rev=1293186919&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 2010-12-24T10:35:19+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ec330_2009/gmcfilter?rev=1293186919&do=diff * Goals: * Understand how to realize filters using transconductors and capacitors * Use a 6V supply for this circuit * 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? text/html 2010-12-24T10:35:19+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ec330_2009/invchar?rev=1293186919&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 Vcc=5V, 6V, and 9V. * Determine the large signal Iout versus Vin * Determine the large signal Vout versus Vin * Determine the small signal parameters of the transconductor text/html 2010-12-24T10:35:19+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ec330_2009/mixer?rev=1293186919&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 frequ… text/html 2010-12-24T10:35:19+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ec330_2009/multistagecomp?rev=1293186919&do=diff * Goals: * Realize high gain accuracy in a feedback amplifier * Preserve stability while doing so * Use a 6V supply for this experiment. You'll need the gm value measured in the previous experiment. * Determine the gain of the amplifier in (a) when the transconductance of the inverter tends to infinity. Build the amplifier in (a) with an ideal gain of 2 and R1 in 5kΩ to 10kΩ range. Use a 6V supply for this experiment. Measure the gain error. Connect inputs of unused inverters to … text/html 2010-12-24T10:35:19+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ec330_2009/oscillator?rev=1293186919&do=diff Oscillator * 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 stu… text/html 2010-12-24T10:35:19+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ec330_2009/phasemargin?rev=1293186919&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 2010-12-24T10:35:19+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ec330_2009/pwmamp?rev=1293186919&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 2010-12-24T10:35:19+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ec330_2009/regulator?rev=1293186919&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 2019-02-11T16:10:36+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ec330_2009/spectrumanalyzer?rev=1549901436&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 2010-12-24T10:35:19+00:00 http://www.ee.iitm.ac.in/vlsi/courses/ec330_2009/start?rev=1293186919&do=diff Coordinators * Nagendra Krishnapura Schedule * P slot(Mondays, 2-5pm) Teaching assistants The TAs can be contacted at ec330 dot 2009 at gmail dot com * Eeshan Miglani * Muthusubramanian NV * Pawan Agarwal * Sandeep Monangi * Shankar P * Siladitya Dey * Sukumar Bandi * Vikas Singh