Figure 5.2. There are two input terminals labeled V sub in. The lower one connects to ground and is labeled with a minus sign. The upper terminal is labeled with a plus sign. The upper input terminal connects to one end of a resistor labeled R sub 1. The other end of this resistor goes to the minus input of a triangle indicating an amplifier. The plus input of the amplifier is grounded. The output of the amplifier goes to one end of a resistor labeled R sub 2. The other end of the resistor goes to the plus input. All voltages are marked with plus and minus signs. V sub in is labeled minus at the bottom and plus at the top. The voltage across R sub 1 is labeled plus on the left and minus on the right. The voltage between the minus input of the amplifier and ground is labeled V sub sig and is positive at the input and negative at ground. The output voltage, V sub O is labeled minus at the input and plus at ground. There are broken lines with arrows indicating the direction in which the equations were written. Equation 5.6 starts at the grounded input terminal, goes up across the input terminals, to the right across R sub 1 and down across V sub sig to ground. Equation 5.7 starts at ground below V sub sig. It goes up across V sub sig, to the right across R sub 2, and down to ground across V sub O. End verbal description.
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