US 12,592,681 B2 · Capacitance multiplier for decoupling capacitor

Abstract

An integrated circuit may include one or more circuits coupled to capacitance multiplier circuitry. The capacitance multiplier circuitry may include a capacitor, fixed and tunable resistances, and a transconductance circuit. The tunable resistance can be adjusted to control the overall capacitance of the capacitance multiplier circuitry. The transconductance circuit may include a transistor having a drain terminal coupled to a first electrical component and a source terminal coupled to a second electrical component. The first electrical component may be a diode-connected transistor, a direct shorting wire, a resistor, an inductor, or a current source. The second electrical component may be a current source, a direct shorting wire, a resistor, an inductor, or another diode-connected device. Configured in this way, the capacitance multiplier circuitry can provide a large adjustable amount of capacitance without a voltage drop and without consuming a large amount of power.

Claims19

Dependent claims

An integrated circuit comprising:

a circuit coupled to a positive power supply line;
a capacitor having a first terminal directly coupled to the positive power supply line and having a second terminal;
an adjustable resistance having a first terminal coupled to the second terminal of the capacitor and having a second terminal coupled to the first terminal of the capacitor;
a first resistor having a first terminal coupled to the positive power supply line and having a second terminal coupled to the second terminal of the adjustable resistance;
a second resistor having a first terminal coupled to the second terminal of the adjustable resistance and having a second terminal coupled to a ground line;
and
a transconductance circuit coupled to the capacitor and the adjustable resistance.

4 more elements

Dependencies are inferred from the claim text.

Capacitance multiplier for decoupling capacitor

Life of this patent

Capacitance multiplier for decoupling capacitor

Life of this patent

Abstract

Claims19