ADAPTIVE FEEDBACK FOR POWER DISTRIBUTION NETWORK IMPEDANCE BARRIER SUPPRESSION
An adaptive feedback circuit may include: a filter having a first terminal coupled to a first power supply line and a second terminal coupled to a second power supply line, the filter configured to output a high-frequency signal that is transmitted between the first and second power supply lines; an amplifier configured to receive the high-frequency signal output from the filter and generate an amplified high-frequency signal at an output of the amplifier; and a capacitor having a first terminal coupled to the first power supply line and a second terminal coupled to the output of the amplifier. The capacitor is configured to receive the amplified high-frequency signal, and the amplified high-frequency signal generated by the amplifier controls a voltage applied between the first terminal and the second terminal of the capacitor.
1 . An adaptive feedback circuit, comprising:
a filter having a first terminal coupled to a first power supply line and a second terminal coupled to a second power supply line, the filter configured to output a high-frequency signal that is transmitted between the first and second power supply lines;
an amplifier configured to receive the high-frequency signal output from the filter and generate an amplified high-frequency signal at an output of the amplifier; and
a capacitor having a first terminal coupled to the first power supply line and a second terminal coupled to the output of the amplifier,
wherein the capacitor is configured to receive the amplified high-frequency signal, and the amplified high-frequency signal generated by the amplifier controls a voltage applied between the first terminal and the second terminal of the capacitor.
2 . The adaptive feedback circuit of claim 1 , wherein the capacitor is coupled proximately to a connection of the first power supply line or the second power supply line with an external power supply.
3 . The adaptive feedback circuit of claim 1 , wherein the amplified high-frequency signal generated by the amplifier controls the voltage applied between the first terminal and the second terminal of the capacitor proportional to the high-frequency signal output by the filter.
4 . The adaptive feedback circuit of claim 1 , wherein the first power supply line is a positive power supply line and the second power supply line is a negative power supply line.
5 . The adaptive feedback circuit of claim 1 , wherein the first power supply line is a negative power supply line and the second power supply line is a positive power supply line.
6 . The adaptive feedback circuit of claim 1 , wherein the filter is a resistive-capacitive high-pass filter.
7 . An integrated circuit (IC), comprising:
an adaptive feedback circuit, the adaptive feedback circuit comprising:
a filter having a first terminal coupled to a first power supply line and a second terminal coupled to a second power supply line, the filter configured to output a high-frequency signal transmitted between the first and second power supply lines;
an amplifier configured to receive the high-frequency signal output from the filter and generate an amplified high-frequency signal at an output of the amplifier; and
a capacitor having a first terminal coupled to the first power supply line and a second terminal coupled to the output of the amplifier,
wherein the capacitor is configured to receive the amplified high-frequency signal, and the amplified high-frequency signal generated by the amplifier controls a voltage applied between the first terminal and the second terminal of the capacitor, and
wherein the capacitor is coupled proximately to a connection of the first power supply line or the second power supply line with a power supply external to the IC.
8 . The IC of claim 7 , wherein the amplified high-frequency signal generated by the amplifier controls the voltage applied between the first terminal and the second terminal of the capacitor proportional to the high-frequency signal output by the filter.
9 . The IC of claim 7 , wherein the first power supply line is a positive power supply line and the second power supply line is a negative power supply line.
10 . The IC of claim 7 , wherein the first power supply line is a negative power supply line and the second power supply line is a positive power supply line.
11 . The IC of claim 7 of claim 7 , the filter is a resistive-capacitive high-pass filter.
12 . A System-on-Chip (SoC), comprising:
a plurality of integrated circuits (ICs) configured to perform operational functions of the SoC;
a power distribution network configured to supply power to at least one of the plurality of ICs; and
a package configured to mechanically enclose the plurality of ICs and the power distribution network, the package comprising one or more electrical leads configured to connect the SoC to a printed circuit board,
wherein the at least one of the plurality of integrated circuits comprises:
an adaptive feedback circuit, comprising:
a filter having a first terminal coupled to a first power supply line and a second terminal coupled to a second power supply line, the filter configured to output a high-frequency signal transmitted between the first and second power supply lines;
an amplifier configured to receive the high-frequency signal output from the filter and generate an amplified high-frequency signal at an output of the amplifier; and
a capacitor having a first terminal coupled to the first power supply line and a second terminal coupled to the output of the amplifier,
wherein the capacitor is configured to receive the amplified high-frequency signal, and the amplified high-frequency signal generated by the amplifier controls a voltage applied between the first terminal and the second terminal of the capacitor.
13 . The SoC of claim 12 , wherein the amplified high-frequency signal generated by the amplifier controls the voltage applied between the first terminal and the second terminal of the capacitor proportional to the high-frequency signal output by the filter.
14 . The SoC of claim 12 , wherein the first power supply line is a positive power supply line and the second power supply line is a negative power supply line.
15 . The SoC of claim 12 , wherein the first power supply line is a negative power supply line and the second power supply line is a positive power supply line.
16 . The SoC of claim 12 , the filter is a resistive-capacitive high-pass filter.
17 . The SoC of claim 12 , wherein the adaptive feedback circuit is disposed internal to the at least one of the plurality of ICs, and
wherein the capacitor is coupled proximately to a connection of the power distribution network with the at least one of the plurality of ICs.
18 . The SoC of claim 12 , wherein the adaptive feedback circuit is disposed external to the at least one of the plurality of ICs, and
wherein the capacitor is coupled proximately to a connection of the power distribution network with the at least one of the plurality of ICs.
19 . A method of reducing noise in a circuit, the method comprising:
filtering a high-frequency signal transmitted between a first power supply line and a second power supply line and outputting the high-frequency signal;
amplifying the high-frequency signal to generate an amplified high-frequency signal; and
supplying current to one of the first and second power supply lines based on the amplified high-frequency signal.
20 . The method of claim 19 , wherein the current is supplied to one of the first and second power supply lines through a capacitor having a first terminal coupled to one of the first and second power supply lines.
21 . The method of claim 20 , further comprising controlling a voltage applied between the first terminal and a second terminal of the capacitor proportional the amplified high-frequency signal.