Lab 4 - Operational Amplifiers 1 Gain ReadMeFirst Lab Summary There are three basic configurations for operational amplifiers. If the amplifier is multiplying the amplitude of the signal, the multiplication factor is called gain. If the amplitude of a signal is reduced at any time it is referred to as attenuation. The two gain configurations you will build are the inverting and non-inverting stages. A third configuration, the unity gain stage, or buffer, is often used to isolate signals and provide additional current capability. There is a limit to the maximum frequency that any op amp can pass without distortion. Moreover, as the gain of an op amp is increased, the maximum frequency that can be amplified without distortion is reduced. This characteristic is the called the Gain Bandwidth Product and is due to the limitation of the Slew Rate of the op amp. The slew rate, usually in Volts / microseconds, is how fast the signal can change and is limited by the internal capacitance of the device. Lab Preparation Please review the following material from previous and current labs before attempting this lab: 1. Review the Introduction to Lab Equipment for operational instructions of the Rigol Triple Output Power Supply. 2. Review Active_Filter_I_Notes.pdf for more background on analog filters. 3. Familiarize yourself with the LME49710NA OP Amp datasheet as it will be referred to throughout the lab. Videos: Operational Amplifiers 1.mp4 Lab Supplies You will need the following supplies for the lab. 1. Bread board and jumper wire kit 2. The following components
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Lab 4 - Operational Amplifiers 1
Gain
ReadMeFirst
Lab Summary
There are three basic configurations for operational amplifiers. If the amplifier is multiplying the amplitude of the signal, the multiplication factor is called gain. If the amplitude of a signal is reduced at any time it is referred to as attenuation. The two gain configurations you will build are the inverting and non-inverting stages. A third configuration, the unity gain stage, or buffer, is often used to isolate signals and provide additional current capability. There is a limit to the maximum frequency that any op amp can pass without distortion. Moreover, as the gain of an op amp is increased, the maximum frequency that can be amplified without distortion is reduced. This characteristic is the called the Gain Bandwidth Product and is due to the limitation of the Slew Rate of the op amp. The slew rate, usually in Volts / microseconds, is how fast the signal can change and is limited by the internal capacitance of the device.
Lab Preparation
Please review the following material from previous and current labs before attempting this lab:
1. Review the Introduction to Lab Equipment for operational instructions of the Rigol Triple Output Power Supply.
2. Review Active_Filter_I_Notes.pdf for more background on analog filters.
3. Familiarize yourself with the LME49710NA OP Amp datasheet as it will be
referred to throughout the lab.
Videos: Operational Amplifiers 1.mp4
Lab Supplies
You will need the following supplies for the lab.
1. Bread board and jumper wire kit 2. The following components
Figure 1 Breadboard
Component Name Quantity Markings
Op-Amp LME49710NA 1 LME49710NA
Resistor 150 Ohm 1 Brn-Grn-Blk-Blk-Brn
Resistor 1.00 KOhm 1 Brn-Blk-Blk-Brn-Brn
Resistor 10.0 KOhm 1 Brn-Blk-Blk-Red-Brn
Resistor 100 KOhm 1 Brn-Blk-Blk-Org-Brn
Capacitors 0.01 uF Ceramic 2 103
Capacitors 1.0 uF Tantalum 2 105, +
3. (1) BNC to BNC Cable
4. (2) BNC to Dual Minigrabber Cables
5. (3) Banana to Minigrabber Cables
(1) Red for +VCC (1) Green for -VCC (1) Black for Ground
(In electronics, Black is ALWAYS ground)
The breadboard used in this lab is shown here:
Figure 2 LME49710NA Operational Amplifier
The pin numbers and functions for the LME49710NA operational amplifier are shown below. The pin below the notch is pin 1 when the IC is oriented with the notch to the left. There is often a small dot in the plastic indicating pin 1.
Figure 3 Recommended Grabber Connections
Figure 4 Recommended bus strips rail layout
Part 1
1. Use the longer jumper wires from your kit to connect the +VCC, -VCC and GND rails to the DC Power Supply.
Fig. 4 shows the bus strips recommended for +VCC, -VCC and GND (ground) rails.
Longer jumper wires can be used to connect the clip of the Banana to Minigrabber cables from the power supply to the correct power bus.