US 6,873,210 B2 · Single-ended-to-differential converter with common-mode voltage control

Abstract

Provided is a circuit to perform single-ended to differential conversion while providing common-mode voltage control. The circuit includes a converter to convert a single-ended signal to a differential signal and a stabilizing circuit adapted to receive the differential signal. The stabilizing circuit includes a sensor configured to sense a common-mode voltage level of the differential signal and a comparator having an output port coupled to the converter. The comparator is configured to compare the differential signal common-mode voltage level with a reference signal common-mode voltage level and produce an adjusting signal based upon the comparison. The adjusting signal is applied to the converter via the output port and is operative to adjust a subsequent common-mode voltage level of the differential signal.

Claims4

Dependent claims

A method to convert a single-ended signal to a differential signal, comprising:

attenuating a single-ended signal received within an attenuator and producing a differential signal at differential output ports formed within the attenuator, the differential signal being based upon the attenuated single-ended signal and a received DC signal;
detecting a common-mode voltage level of the differential signal and providing the detected common-mode voltage level to an inverting input port of an amplifier;
providing a reference common-mode voltage signal to a non-inverting input port of the amplifier;
comparing the detected common-mode voltage level with a voltage level of the reference signal and providing an adjusting signal at an amplifier output port based upon the comparison;
and
adjusting common-mode voltage levels of subsequently produced differential signals based upon the adjusting signal.

3 more elements

Dependencies are inferred from the claim text.

Single-ended-to-differential converter with common-mode voltage control

Life of this patent

Single-ended-to-differential converter with common-mode voltage control

Life of this patent

Abstract

Claims4