US 2026/0291503 A1 · OSCILLATOR CIRCUIT AND CURRENT COMPENSATION CIRCUIT FOR OSCILLATOR

Abstract

A current compensation circuit and an oscillator circuit including the same are provided. The current compensation circuit includes a current generating circuit and a signal generator. The current generating circuit has a first node and a second node. The first node is coupled to an input voltage. The second node is coupled to a process-dependent current. The current generating circuit can provide a compensation current according to the input voltage and the process-dependent current. The signal generator is coupled to the first node, and can capacitively couple a supply voltage to the first node to provide the input voltage. The oscillator is driven by a supply current. The current generating circuit is arranged to draw the compensation current from the supply current to compensate for a variation in the supply current generated in response to the variation in the supply voltage.

Claims20

Dependent claims

A current compensation circuit for an oscillator, comprising:

a current generating circuit, having a first node and a second node, the first node being coupled to an input voltage, the second node being coupled to a process-dependent current, the current generating circuit being configured to provide a compensation current according to the input voltage and the process-dependent current;
and
a signal generator, coupled to the first node, the signal generator being configured to capacitively couple a supply voltage to the first node to provide the input voltage, wherein a signal level of the input voltage changes in response to a variation in the supply voltage;
wherein a supply node of the oscillator is arranged to receive a supply current to drive the oscillator, and the current generating circuit is arranged to draw the compensation current from the supply node of the oscillator to compensate for a variation in the supply current generated in response to the variation in the supply voltage.

1 more element

An oscillator circuit, comprising:

a current generator, supplied by a supply voltage to output a supply current;
an oscillator, having a supply node arranged to receive the supply current, the oscillator being arranged to generate an oscillating signal according to a driving current, wherein a portion of the supply current flows into the oscillator from the supply node of the oscillator and serves as the driving current;
and
a current compensation circuit, coupled to the supply node of the oscillator, the current compensation circuit being configured to generate a compensation current according to the supply voltage, a reference signal and a first process-dependent current,
wherein a signal level of the reference signal is independent of a variation in the supply voltage, and the compensation current changes in response to the variation in the supply voltage;
the current compensation circuit is arranged to draw the compensation current from the supply node of the oscillator to compensate for a variation in the supply current generated in response to the variation in the supply voltage.

3 more elements

Dependencies are inferred from the claim text.

Oscillator circuit and current compensation circuit for oscillator

Life of this patent

Oscillator circuit and current compensation circuit for oscillator

Life of this patent

Abstract

Claims20