METHOD, APPARATUS AND SYSTEM FOR LEVEL SHIFTING OF COMMON MODE VOLTAGE FROM INPUT TO OUTPUT FOR CAPACITIVE FEEDBACK TRANSIMPEDANCE AMPLIFIER

摘要

A circuit for a level shifting of common mode voltage. The circuit includes a first amplifier, wherein the input of the first amplifier is coupled to a voltage source and another input of the first amplifier is coupled 2.5v, feedback resistor, Rfb, and feedback capacitor, Cfb, connected coupled to the voltage source, wherein other side of feedback resistor is coupled between two resistors, R2 and R2′, and wherein the other side of the feedback capacitor is coupled between R2′ and the output of the first amplifier, R2 is connected to Vbias from one side and Rfb and R2′ from the other, R2′ is connected to Rfb and R2 from one side and Cfb and output of the first amplifier from the other side, another resistor, R1, is connect to the output of the first amplifier, Cfb and R2′ from one side and R1′, yet another resistor, and input of amp2 from the other, a second amplifier, Amp2, is connected to the R1 and R1′ at one input and 1.5v at the other input, and wherein the output of the second amplifier is connected to R1′, and R1′ connects to one input of the second amplifier and the output of the second amplifier.

主权项

1. A circuit for a level shifting of common mode voltage, comprising:
A first amplifier, wherein the input of the first amplifier is coupled to a voltage source and another input of the first amplifier is coupled 2.5v; feedback resistor, Rfb, and feedback capacitor, Cfb, connected coupled to the voltage source, wherein other side of feedback resistor is coupled between two resistors, R2 and R2′, and wherein the other side of the feedback capacitor is coupled between R2′ and the output of the first amplifier; R2 is connected to Vbias from one side and Rfb and R2′ from the other; R2′ is connected to Rfb and R2 from one side and Cfb and output of the first amplifier from the other side; another resistor, R1, is connect to the output of the first amplifier, Cfb and R2′ from one side and R1′, yet another resistor, and input of amp2 from the other; a second amplifier, Amp2, is connected to the R1 and R1′ at one input and 1.5v at the other input, and wherein the output of the second amplifier is connected to R1′; and R1′ connects to one input of the second amplifier and the output of the second amplifier.