IP Library › Granted Patent US 12676582
Granted Patent B2
US 12676582 · App. 18/448,380 · Granted Jul 7, 2026

De-skewing of differential signals

Inventors: Bhyrav M. Mutnury (Austin, TX); Sandor T. Farkas (Round Rock, TX)
Assignee: Dell Products L.P.
H03F3/45475H03F2200/129H03F2200/165
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Quick Facts
Patent No.
US 12676582
App. No.
18/448,380
Granted
Jul 7, 2026
Kind
B2
Abstract

A circuit may include a difference amplifier configured to determine a difference between a first amplitude of a first signal and a second amplitude of a second signal within a particular frequency band, an integrator configured to generate, based on the difference, a first and second bias signal, a first variable capacitor coupled to a first trace for carrying the first signal and configured to receive the first bias signal to control a first propagation speed of the first signal, the first propagation speed of the first signal corresponding to a first magnitude of the first bias signal, and a second variable capacitor coupled to a second trace for carrying the second signal and configured to receive the second bias signal to control a second propagation speed of the second signal, the second propagation speed of the second signal corresponding to a second magnitude of the second bias signal.

Claims (47)

1 . A circuit, comprising:

a difference amplifier configured to determine a difference between a first amplitude of a first signal within a particular frequency band and a second amplitude of a second signal within the particular frequency band;

an integrator configured to generate, based on the difference, a first bias signal and a second bias signal;

a first variable capacitor coupled to a first trace for carrying the first signal and configured to receive the first bias signal to control a first propagation speed of the first signal, the first propagation speed of the first signal corresponding to a first magnitude of the first bias signal; and

a second variable capacitor coupled to a second trace for carrying the second signal and configured to receive the second bias signal to control a second propagation speed of the second signal, the second propagation speed of the second signal corresponding to a second magnitude of the second bias signal.

2 . The circuit of claim 1 , wherein:

the first variable capacitor comprises a first diode anode-coupled to the first trace and cathode-coupled to a first output of the integrator that generates the first bias signal; and

the second variable capacitor comprises a second diode anode-coupled to the second trace and cathode-coupled to a second output of the integrator that generates the second bias signal.

3 . The circuit of claim 1 , further comprising:

a first band-pass filter configured to filter the first signal within the particular frequency band; and

a second band-pass filter configured to filter the second signal within the particular frequency band.

4 . The circuit of claim 3 , further comprising:

a first peak detector configured to measure the first amplitude of the first signal within the particular frequency band; and

a second peak detector configured to measure the second amplitude of the second signal within the particular frequency band.

5 . The circuit of claim 1 , wherein the particular frequency band is approximate to a Nyquist frequency.

6 . An information handling system comprising:

a computing component configured to process a differential signal; and

a circuit configured to compensate for signal skew in the differential signal, comprising:

a difference amplifier configured to determine a difference between a first amplitude of a first signal of the differential signal within a particular frequency band and a second amplitude of a second signal of the differential signal with the particular frequency band;

an integrator configured to generate, based on the difference, a first bias signal and a second bias signal;

a first variable capacitor coupled to a first trace for carrying the first signal and configured to receive the first bias signal to control a first propagation speed of the first signal, the first propagation speed of the first signal corresponding to a first magnitude of the first bias signal; and

a second variable capacitor coupled to a second trace for carrying the second signal and configured to receive the second bias signal to control a second propagation speed of the second signal, the second propagation speed of the second signal corresponding to a second magnitude of the second bias signal.

7 . The information handling system of claim 6 , wherein:

the first variable capacitor comprises a first diode anode-coupled to the first trace and cathode-coupled to a first output of the integrator that generates the first bias signal; and

the second variable capacitor comprises a second diode anode-coupled to the second trace and cathode-coupled to a second output of the integrator that generates the second bias signal.

8 . The information handling system of claim 6 , further comprising:

a first band-pass filter configured to filter the first signal within the particular frequency band; and

a second band-pass filter configured to filter the second signal within the particular frequency band.

9 . The information handling system of claim 8 , further comprising:

a first peak detector configured to measure the first amplitude of the first signal within the particular frequency band; and

a second peak detector configured to measure the second amplitude of the second signal within the particular frequency band.

10 . The information handling system of claim 6 , wherein the particular frequency band is approximate to a Nyquist frequency.

11 . A method comprising:

determining a difference between a first amplitude of a first signal within a particular frequency band and a second amplitude of a second signal within the particular frequency band;

generating with an integrator, based on the difference, a first bias signal and a second bias signal;

controlling a first propagation speed of the first signal with a first variable capacitor coupled to a first trace for carrying the first signal, the first propagation speed of the first signal corresponding to a first magnitude of the first bias signal; and

controlling a second propagation speed of the second signal with a second variable capacitor coupled to a second trace for carrying the second signal, the second propagation speed of the second signal corresponding to a second magnitude of the second bias signal.

12 . The method of claim 11 , wherein:

the first variable capacitor comprises a first diode anode-coupled to the first trace and cathode-coupled to a first output of the integrator that generates the first bias signal; and

the second variable capacitor comprises a second diode anode-coupled to the second trace and cathode-coupled to a second output of the integrator that generates the second bias signal.

13 . The method of claim 11 , further comprising:

filtering the first signal within the particular frequency band; and

filtering the second signal within the particular frequency band.

14 . The method of claim 13 , further comprising:

measuring the first amplitude of the first signal within the particular frequency band with a first peak detector; and

measuring the second amplitude of the second signal within the particular frequency band with a second peak detector.

15 . The method of claim 11 , wherein the particular frequency band is approximate to a Nyquist frequency.