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US 12,355,448 B2Granted
Slew rate in low-speed data communication interfaces
AssigneeDell Products L.P.
InventorsSandor Farkas, Bhyrav Mutnury
Life of this patent
Estimating the term…
Abstract
A circuit includes an inductive circuit trace and a nonlinear device. The circuit conducts a signal input to a load. The circuit trace receives the signal input at a first end of the circuit trace and provides the signal input to the load at a second end of the circuit trace. The nonlinear device is coupled at the second end and is configured to increase a voltage rise time of the signal input.
Claims8
A circuit for conducting a signal input to a load, the circuit comprising:
- an inductive circuit trace to receive the signal input at a first end of the circuit trace, and to provide the signal input to the load at a second end of the circuit trace;
- and
- a nonlinear device coupled at the second end and configured to increase a voltage rise time of the signal input;
- wherein:
- when the signal input is in a low state, the non-linear element is in a conducting state and drives a current into the circuit trace to a source of the input signal;
- when the signal input transitions from the low state to a high state, the non-linear element enters a reverse recovery state that increases the current through the circuit trace, such that a voltage at the load increases at a first rate until a reverse recovery charge on the non-linear element is depleted;
- after the reverse recovery charge is depleted, the non-linear element enters an open-circuit state, and the voltage at the load increases at a second rate until an inductive current from the circuit trace is depleted;
- and
- after the inductive current is depleted, the voltage at the load increases at a third rate, wherein the first rate is lower than the third rate and the third rate is lower than the second rate.
6 more elements
A method for conducting a signal input to a load, the method comprising:
- providing an inductive circuit trace to receive the signal input at a first end of the circuit trace, and to provide the signal input to the load at a second end of the circuit trace;
- and
- providing a nonlinear device coupled at the second end and configured to increase a voltage rise time of the signal input;
- wherein:
- when the signal input is in a low state, the non-linear element is in a conducting state and drives a current into the circuit trace to a source of the input signal;
- when the signal input transitions from the low state to a high state, the non-linear element enters a reverse recovery state that increases the current through the circuit trace, such that a voltage at the load increases at a first rate until a reverse recovery charge on the non-linear element is depleted;
- after the reverse recovery charge is depleted, the non-linear element enters an open-circuit state, and the voltage at the load increases at a second rate until an inductive current from the circuit trace is depleted;
- and
- after the inductive current is depleted, the voltage at the load increases at a third rate, wherein the first rate is lower than the third rate and the third rate is lower than the second rate.
6 more elements
A printed circuit board, comprising:
- a source device configured to provide a signal input;
- an inductive circuit trace to receive the signal input at a first end of the circuit trace;
- a load configured to receive the signal input at a second end of the circuit trace;
- and
- a diode device coupled at the second end and configured to increase a voltage rise time of the signal input;
- wherein:
- when the signal input is in a low state, the diode is in a conducting state and drives a current into the circuit trace to a source of the input signal;
- when the signal input transitions from the low state to a high state, the diode enters a reverse recovery state that increases the current through the circuit trace, such that a voltage at the load increases at a first rate until a reverse recovery charge on the non-linear element is depleted;
- after the reverse recovery charge is depleted, the diode enters an open-circuit state, and the voltage at the load increases at a second rate until an inductive current from the circuit trace is depleted;
- and
- after the inductive current is depleted, the voltage at the load increases at a third rate, wherein the first rate is lower than the third rate and the third rate is lower than the second rate.
8 more elements
Dependencies are inferred from the claim text.