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university:courses:electronics:electronics-lab-20 [01 Feb 2019 13:01] – [Appendix: Making an inverter with the CD4007 transistor array] add LTspice files Antoniu Miclaus | university:courses:electronics:electronics-lab-20 [23 Aug 2019 13:50] – Antoniu Miclaus | ||
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- | ====== Activity | + | ====== Activity: CMOS Amplifier stages====== |
===== Objective: ===== | ===== Objective: ===== | ||
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The goal is to explore a high gain inverting amplifier constructed from complementary MOS devices. | The goal is to explore a high gain inverting amplifier constructed from complementary MOS devices. | ||
- | ====== | + | ====== 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 4V amplitude and 2.5V offset. Both scope channels should be set to 1V/Div. If you are using the CD4069A on the plus and minus power supplies you will need to use a larger 8V amplitude and 0V offset. | + | Configure the waveform generator for a 1 KHz triangle wave with 4V amplitude |
{{ : | {{ : | ||
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<WRAP centeralign> | <WRAP centeralign> | ||
- | ====== | + | ====== Adding negative feedback ====== |
On your solder-less breadboard construct the amplifier circuit shown in figure 4 below. | On your solder-less breadboard construct the amplifier circuit shown in figure 4 below. | ||
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===== Hardware Setup: ===== | ===== Hardware Setup: ===== | ||
- | Configure the waveform generator for a 1 KHz sine wave with 2V amplitude and 0V offset. Both scope channels should be set to 1V/Div. | + | Configure the waveform generator for a 1 KHz sine wave with 2V amplitude |
<WRAP centeralign> | <WRAP centeralign> | ||
===== Procedure: ===== | ===== Procedure: ===== | ||
- | Apply a sinusoidal signal of 2V amplitude with zero offset voltage to the input and measure the gain of the entire system from 10 to 100 KHz. Use the Network (Bode) analyzer to plot gain and phase vs. frequency for the entire system. | + | Apply a sinusoidal signal of 2V amplitude |
===== Questions: ===== | ===== Questions: ===== | ||
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What is the gain from the input source, W1, to the output seen at the inverter output? Which components set this gain and why? | What is the gain from the input source, W1, to the output seen at the inverter output? Which components set this gain and why? | ||
- | ====== | + | ====== |
On your solder-less breadboard construct the amplifier circuit shown in figure 5 below. | On your solder-less breadboard construct the amplifier circuit shown in figure 5 below. | ||
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===== Hardware Setup: ===== | ===== Hardware Setup: ===== | ||
- | Configure the waveform generator for a 1 KHz sine wave with 2V amplitude and 0V offset. Both scope channels should be set to 1V/Div. | + | Configure the waveform generator for a 1 KHz sine wave with 2V amplitude |
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===== Procedure: ===== | ===== Procedure: ===== | ||
- | Apply a sinusoidal signal of 2V amplitude with zero offset voltage to the input and measure the gain of the entire system from 10 to 100 KHz. Use the Network (Bode) analyzer to plot gain and phase vs. frequency for the entire system. | + | Apply a sinusoidal signal of 2V amplitude |
===== Questions: ===== | ===== Questions: ===== | ||
- | ====== | + | ====== |
In this part of the lab activity, the CD4069A(UB) un-buffered hex CMOS inverter and a CD4066 Quad analog switch are used as elements of a chopper amplifier. Reconnect the breadboard as indicated in figure 6. Referring to figure 6, the various functions of this circuit can be determined. The two inverters on the bottom left of figure 6 create a square wave and its complement to drive the switch controls of the CD4066. These square waves drive the switches, with switches A and B functioning as a single-pole, | In this part of the lab activity, the CD4069A(UB) un-buffered hex CMOS inverter and a CD4066 Quad analog switch are used as elements of a chopper amplifier. Reconnect the breadboard as indicated in figure 6. Referring to figure 6, the various functions of this circuit can be determined. The two inverters on the bottom left of figure 6 create a square wave and its complement to drive the switch controls of the CD4066. These square waves drive the switches, with switches A and B functioning as a single-pole, | ||
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==== Chopper Amplifier DC Transfer Characteristic ==== | ==== Chopper Amplifier DC Transfer Characteristic ==== | ||
- | Measure the transfer characteristic (DC gain) of the chopper amplifier by applying DC voltages between about -2 V and +2 V to the input and measuring the output. This can be done manually using waveform generator W1 with a DC wave shape and setting the offset. Be sure to take sufficient data to determine the linear and nonlinear ranges of the transfer characteristic. To reduce data taking time, try using the waveform generator to provide a very low frequency (100 Hz) triangle signal with 0V offset. For example, a 4V amplitude setting will give outputs between +2V and -2V, respectively. | + | Measure the transfer characteristic (DC gain) of the chopper amplifier by applying DC voltages between about -2 V and +2 V to the input and measuring the output. This can be done manually using waveform generator W1 with a DC wave shape and setting the offset. Be sure to take sufficient data to determine the linear and nonlinear ranges of the transfer characteristic. To reduce data taking time, try using the waveform generator to provide a very low frequency (100 Hz) triangle signal with 0V offset. For example, a 4V amplitude |
==== Chopper Amplifier Frequency Response ==== | ==== Chopper Amplifier Frequency Response ==== | ||
- | Apply a sinusoidal signal of 400mV amplitude with zero offset voltage to the input and measure the gain of the entire system from 10 to 100 KHz. Use the Network (Bode) analyzer to plot gain and phase vs. frequency for the entire system, paying special attention to the 50KHz to 100KHz range and the region near the frequency of the chopping clock. | + | Apply a sinusoidal signal of 400mV amplitude |
==== Chopper Amplifier Results ==== | ==== Chopper Amplifier Results ==== | ||
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These three inverters can be used to construct the three stage amplifier in section 20.3 for example. | These three inverters can be used to construct the three stage amplifier in section 20.3 for example. | ||
+ | <WRAP round download> | ||
**Resources: | **Resources: | ||
* Fritzing files: [[ https:// | * Fritzing files: [[ https:// | ||
* LTspice files: [[ https:// | * LTspice files: [[ https:// | ||
+ | </ | ||
**Return to Lab Activity [[university: | **Return to Lab Activity [[university: | ||