Crosstalk reduction in parsitically coupled circuits
AssigneeLucent Technologies Inc.
InventorJoseph Peter Savicki
Life of this patent
Estimating the term…
Abstract
The amplification of crosstalk between two isolated circuits due to a resonant condition between the two circuits is reduced by coupling the electrical grounds associated with the circuits with a series Resistor-Capacitor network.
Claims15
A resistor-capacitor network for reducing crosstalk due to a resonant condition between a first circuit having a first electrical ground and a second circuit having a second electrical ground where signals of a certain quality are applied to the circuits, the resistor-capacitor network comprising:
- a resistor connected to the first electrical ground;
- and
- a capacitor connected to the resistor and to the second electrical ground where the first and second electrical grounds are mounted on a layer of insulating material;
- the capacitor allowing a current to flow from the first electrical ground to the second electrical ground and through the resistor during a resonant condition thereby reducing the crosstalk due to resonance between the circuits substantially without degrading the quality of the applied signals.
A DDF module comprising:
- a printed circuit board having at least one layer;
- a first circuit and a second circuit mounted on the printed circuit board;
- a first electrical ground associated with the first circuit and a second electrical ground associated with the second circuit are etched onto the at least one layer of the printed circuit board;
- a resistor-capacitor network that couples the electrical grounds allowing a current to flow from the first electrical ground to the second electrical ground thereby reducing any crosstalk between the first and second circuit.
A DDF module comprising:
- a first connector for coupling to a cable carrying a first signal;
- a second connector for coupling to a cable carrying a second signal;
- a first monitor connector for monitoring signals at the first connector;
- a second monitor connector for monitoring signals at the second connector;
- a first circuit having a first electrical ground is coupled to the first connector;
- a second circuit having a second electrical ground is coupled to the second connector;
- and
- a resistor-capacitor network coupling the electrical grounds allowing a current to flow from the first electrical ground to the second electrical ground so as to reduce crosstalk between the first and second signals.
A circuit for reducing crosstalk, the circuit comprising:
- a resistor-capacitor network having at least one resistor coupled to at least one capacitor;
- the resistor-capacitor network coupling different grounds of different electrical circuits allowing a current to flow between the grounds so as to reduce crosstalk between such circuits.
Dependencies are inferred from the claim text.