US 6,636,116 B2 · Fully differential current feedback amplifier

Abstract

A current feedback amplifier is disclosed for providing a differential output based on a single-ended or differential input signal, having first and second low impedance inputs to receive first and second input signals, and first and second phase shifting systems providing first and second phase shifted input signals based on the second and first input signals. A first intermediate system provides a first intermediate signal comprising the first input signal and the first phase shifted input signal, and a second intermediate system provides a second intermediate signal comprising the second input signal and the second phase shifted input signal, wherein gains may be applied to one or more of the input and/or phase shifted signals. The amplifier further comprises first and second output buffers providing first and second differential output signals based on the first and second intermediate signals, respectively.

Claims18

Dependent claims

A differential current feedback amplifier for providing a differential output based on at least one input, comprising:

first and second low impedance input systems operatively coupled with first and second input terminals, respectively;
a first gain system receiving first and second input signals from the first and second low impedance input systems, respectively, and operative to provide a first phase shifted signal based on the second input signal and a first intermediate signal based on the first input signal and the first phase shifted signal, wherein the first phase shifted signal is out of phase with the second input signal by a first phase shift value;
a second gain system receiving the first and second input signals, and operative to provide a second phase shifted signal based on the first input signal and a second intermediate signal based on the second input signal and the second phase shifted signal, wherein the second phase shifted signal is out of phase with the first input signal by a second phase shift value;
and
first and second output systems operatively coupled with the first and second gain systems to receive the first and second intermediate signals, respectively, and to provide first and second differential output signals to first and second output terminals based on the first and second intermediate signals, respectively.

2 more elements

A current feedback amplifier for providing a differential output based on at least one input, comprising:

first and second low impedance input systems operatively coupled with first and second input terminals to receive first and second input signals therefrom, respectively;
first and second phase shifting systems providing first and second phase shifted input signals based on the second and first input signals, respectively;
first and second intermediate systems providing first and second intermediate signals, respectively, wherein the first intermediate signal comprises the first input signal and the first phase shifted input signal, and wherein the second intermediate signal comprises the second input signal and the second phase shifted input signal;
and
first and second output buffers receiving the first and second intermediate signals, respectively, and operative to provide first and second differential output signals to first and second output terminals based on the first and second intermediate signals, respectively.

2 more elements

A current feedback amplifier for providing a differential output based on at least one input, comprising:

first and second low impedance input systems operatively coupled with first and second input terminals to receive first and second input signals therefrom, respectively;
means for providing first and second phase shifted input signals based on the second and first input signals, respectively;
means for summing the first input signal and the first phase shifted input signal to provide a first intermediate signal at a first intermediate node;
means for summing the second input signal and the second phase shifted input signal to provide a second intermediate signal at a second intermediate node;
and
means for providing first and second differential output signals to first and second output terminals based on the first and second intermediate signals, respectively.

3 more elements

Dependencies are inferred from the claim text.

Fully differential current feedback amplifier

Life of this patent

Fully differential current feedback amplifier

Life of this patent

Abstract

Claims18