Level-shifting amplifier

摘要

A differential amplifier may, when connected to a positive or negative supply voltage and to a ground voltage, provide a differential pair of outputs signals at a differential output that are an amplification of a differential pair of input signals at a differential input. A differential input stage may receive the differential pair of input signals from the differential input and may include a first transistor associated with one of the input signals and a second transistor associated with the other input signal. A differential output stage may generate the differential pair of output signals at the differential output and may include a third transistor associated with one of the output signals and a fourth transistor associated with the other output signal. The first, second, third, and fourth transistors may be all P type or all N type. The differential pair of output signals may have a common mode that is: near the ground voltage when the first, second, third, and fourth transistors are all N type and the supply voltage is positive with respect to the ground voltage; near the supply voltage when the first, second, third, and fourth transistors are all P type and the supply voltage is positive with respect to the ground voltage; near the ground voltage when the first, second, third, and fourth transistors are all P type and the supply voltage is negative with respect to the ground voltage; or near the supply voltage when the first, second, third, and fourth transistors are all N type and the supply voltage is negative with respect to the ground voltage.

主权项

1. A differential amplifier that, when connected to a positive or negative supply voltage and to a ground voltage, provides a differential pair of outputs signals at a differential output that are an amplification of a differential pair of input signals at a differential input, comprising:
a differential input stage that receives the differential pair of input signals from the differential input and that includes a first transistor associated with one of the input signals and a second transistor associated with the other input signal; and a differential output stage that generates the differential pair of output signals at the differential output and that includes a third transistor associated with one of the output signals and a fourth transistor associated with the other output signal, wherein the first, second, third, and fourth transistors are all P type or all N type, and wherein the differential pair of output signals has a common mode that is:
near the ground voltage when the first, second, third, and fourth transistors are all N type and the supply voltage is positive with respect to the ground voltage;near the supply voltage when the first, second, third, and fourth transistors are all P type and the supply voltage is positive with respect to the ground voltage;near the ground voltage when the first, second, third, and fourth transistors are all P type and the supply voltage is negative with respect to the ground voltage; ornear the supply voltage when the first, second, third, and fourth transistors are all N type and the supply voltage is negative with respect to the ground voltage.