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US 12,712,566 B1Granted
Sigma-delta modulator and a class D amplifier
AssigneeRenesas Design Netherlands B.V.
InventorAnthony Magrath
Life of this patent
Estimating the term…
Abstract
A sigma-delta modulator having a sigma-delta block providing a non-limiting output and having a stabilizer receiving the output of the sigma-delta block and transmitting a stabilised loop signal wherein the sigma-delta block and stabilizer are arranged as a sigma-delta loop. The sigma-delta block receives the stabilized loop signal from the stabilizer, thereby stabilizing the sigma-delta block.
Claims17
A sigma-delta modulator, comprising:
- a sigma-delta circuit configured to provide a non-limiting output;
- and
- a stabilizer configured to:
- receive the non-limiting output of the sigma-delta circuit;
- and
- transmit a stabilized loop signal;
- wherein:
- the sigma-delta circuit and stabilizer are arranged as a sigma-delta loop;
- the sigma-delta circuit is configured to receive the stabilized loop signal from the stabilizer for stabilizing the sigma-delta circuit;
- the stabilizer comprises:
- a saturator arranged to restrict the non-limiting output of the sigma-delta circuit to a predetermined limit;
- a subtractor configured to extract an overload signal that is determined by a difference in magnitude between the non-limiting output of the sigma-delta circuit and the predetermined limit;
- a first overload adder configured to add the overload signal from the subtractor with the predetermined limit to form a combined feedback signal;
- and
- the combined feedback signal is the stabilized loop signal transmitted by the stabilizer and received by the sigma-delta circuit.
12 more elements
A class D amplifier comprising;
- a sigma-delta modulator, comprising:
- a sigma-delta circuit arranged to provide a non-limiting output;
- a stabilizer arranged to receive the non-limiting output from the sigma-delta circuit and transmit a stabilised loop signal;
- wherein:
- the sigma-delta circuit and stabilizer are arranged as a sigma-delta loop;
- the sigma-delta circuit receives the stabilized loop signal from the stabilizer for stabilizing the sigma-delta circuit;
- the stabilizer comprises:
- a saturator arranged to restrict the non-limiting output of the sigma-delta circuit to a predetermined limit;
- a subtractor configured to extract an overload signal that is determined by a difference in magnitude between an output signal of the sigma-delta circuit over the predetermined limit;
- a first overload adder configured to add the overload signal from the subtractor with the predetermine limit to form a combined feedback signal;
- and
- the combined feedback signal is the stabilized loop signal transmitted by the stabilizer and received by the sigma-delta circuit.
9 more elements
A method of stabilizing a sigma-delta modulator comprising:
- providing a non-limiting output using a sigma-delta circuit;
- receiving the non-limiting output at a stabilizer;
- transmitting a stabilized loop signal from the stabilizer;
- receiving the stabilized loop signal at the sigma-delta circuit;
- and
- using the stabilized loop signal to stabilize the sigma-delta circuit for stabilizing the sigma-delta modulator, wherein:
- the stabilizer comprises:
- a saturator arranged to restrict the non-limiting output of the sigma-delta circuit to a predetermined limit;
- a subtractor configured to extract an overload signal that is determined by a difference in magnitude between an output signal of the sigma-delta circuit over the predetermined limit;
- a first overload adder configured to add the overload signal from the subtractor with the predetermine limit to form a combined feedback signal;
- and
- the combined feedback signal is the stabilized loop signal transmitted by the stabilizer and received by the sigma-delta circuit.
9 more elements
Dependencies are inferred from the claim text.