AMPLIFIER AND METHOD OF AMPLIFYING A DIFFERENTIAL SIGNAL

摘要

An amplifier includes a differential input with a positive and a negative input and an analog integrator with a differential integrator input and a differential integrator output. The analog integrator further includes an operational amplifier with a positive operational amplifier input, a negative operational amplifier input, a positive operational amplifier output and a negative operational amplifier output. The differential integrator input is coupled to the differential input. A ternary pulse width modulator includes two modulator inputs coupled to the differential integrator output and two modulator outputs. A first feedback path is coupled between a first of the two modulator outputs and the positive operational amplifier input and a second feedback path is coupled between a second of the two modulator outputs and the negative operational amplifier input. A first divert capacitor is coupled between the positive operational amplifier input and a constant voltage reference. A second divert capacitor is coupled between the negative operational amplifier input and the constant voltage reference.

主权项

1. An amplifier, comprising:
a differential input comprising a positive input and a negative input; an analog integrator comprising a differential integrator input and a differential integrator output, the analog integrator further comprising an operational amplifier, the operational amplifier comprising a positive operational amplifier input, a negative operational amplifier input, a positive operational amplifier output and a negative operational amplifier output, the differential integrator input being coupled to the differential input; a ternary pulse width modulator comprising two modulator inputs coupled to the differential integrator output and two modulator outputs; a first feedback path coupled between a first of the two modulator outputs and the positive operational amplifier input and a second feedback path coupled between a second of the two modulator outputs and the negative operational amplifier input; and a first divert capacitor coupled between the positive operational amplifier input and a constant voltage reference, and a second divert capacitor coupled between the negative operational amplifier input and the constant voltage reference.