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| university:courses:electronics:electronics-lab-21 [23 Mar 2017 16:34] – [Directions:] Doug Mercer | university:courses:electronics:electronics-lab-21 [12 Jul 2019 14:01] – Pop Andreea | ||
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| - | ====== Activity | + | ====== Activity: CMOS LC Oscillator ====== |
| ===== Objective: ===== | ===== Objective: ===== | ||
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| The goal is to explore the use of the high gain inverting CMOS amplifier in a LC oscillator. | The goal is to explore the use of the high gain inverting CMOS amplifier in a LC oscillator. | ||
| - | ====== | + | ====== High gain inverting amplifier ====== |
| ===== Materials: ===== | ===== Materials: ===== | ||
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| ===== Hardware Setup: ===== | ===== Hardware Setup: ===== | ||
| - | Configure the waveform generator for a 1 KHz triangle wave with 2V amplitude and 2.5V offset. Both scope channels should be set to 1V/Div. | + | Configure the waveform generator for a 1 KHz triangle wave with 4V amplitude and 2.5V offset. Both scope channels should be set to 1V/Div. |
| ===== Procedure: ===== | ===== Procedure: ===== | ||
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| Measure the slope of the output and calculate the DC gain of the amplifier as the ratio of the change in the output voltage to the change in input voltage at the center of the output swing (i.e. around 2.5V). Remember this should be a negative number because the amplifier inverts. | Measure the slope of the output and calculate the DC gain of the amplifier as the ratio of the change in the output voltage to the change in input voltage at the center of the output swing (i.e. around 2.5V). Remember this should be a negative number because the amplifier inverts. | ||
| - | ====== | + | ====== Adding LC resonator ====== |
| On your solder-less breadboard construct the filter network shown in figure 4 below. Using the Network (Bode) analyzer tool measure the gain and phase response of the LC network. | On your solder-less breadboard construct the filter network shown in figure 4 below. Using the Network (Bode) analyzer tool measure the gain and phase response of the LC network. | ||
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| ===== Hardware Setup: ===== | ===== Hardware Setup: ===== | ||
| - | Configure the Network (Bode) analyzer for 2 log decades, end frequency of 100 KHz, a max gain of 2X, run time of 10 sec, offset of 0 V and an amplitude of 1 V. Run a single sweep and save the data to a file. | + | Configure the Network (Bode) analyzer for 2 log decades, end frequency of 100 KHz, a max gain of 2X, run time of 10 sec, offset of 0 V and an amplitude of 2 V. Run a single sweep and save the data to a file. |
| =====Question: | =====Question: | ||
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| Based on the frequency response of the LC network, at what frequency do you think the circuit will oscillate? | Based on the frequency response of the LC network, at what frequency do you think the circuit will oscillate? | ||
| - | ====== | + | ====== Placing LC network in feedback of amplifier ====== |
| {{ : | {{ : | ||
university/courses/electronics/electronics-lab-21.txt · Last modified: 13 Jun 2022 20:06 by Doug Mercer