Open loop ripple cancellation circuit in a DC-DC converter
First Claim
1. Circuitry comprising:
- a parallel amplifier configured to during a calibration mode, regulate a power supply output voltage based on a calibration setpoint;
a switching supply configured to drive a parallel amplifier output current toward zero using a switching control signal, such that during the calibration mode, an estimate of a current gain is based on the switching control signal; and
an open loop ripple cancellation circuit configured to;
during the calibration mode, be disabled; and
during a normal operation mode, provide a ripple cancellation current based on the estimate of the current gain.
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Accused Products
Abstract
A direct current (DC)-DC converter, which includes an open loop ripple cancellation circuit, a switching supply, and a parallel amplifier, is disclosed. During a calibration mode, the parallel amplifier provides a parallel amplifier output current to regulate a power supply output voltage based on a calibration setpoint. The switching supply drives the parallel amplifier output current toward zero using a switching control signal, such that during the calibration mode, an estimate of a current gain is based on the switching control signal. Further, during the calibration mode, the open loop ripple cancellation circuit is disabled. During a normal operation mode, the open loop ripple cancellation circuit provides a ripple cancellation current, which is based on the estimate of the current gain.
371 Citations
26 Claims
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1. Circuitry comprising:
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a parallel amplifier configured to during a calibration mode, regulate a power supply output voltage based on a calibration setpoint; a switching supply configured to drive a parallel amplifier output current toward zero using a switching control signal, such that during the calibration mode, an estimate of a current gain is based on the switching control signal; and an open loop ripple cancellation circuit configured to; during the calibration mode, be disabled; and during a normal operation mode, provide a ripple cancellation current based on the estimate of the current gain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method comprising:
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during a calibration mode, regulating a power supply output voltage based on a calibration setpoint using a parallel amplifier; driving a parallel amplifier output current toward zero using a switching supply based on a switching control signal, such that during the calibration mode, an estimate of a current gain is based on the switching control signal; during the calibration mode, disabling an open loop ripple cancellation circuit; and during a normal operation mode, providing a ripple cancellation current based on the estimate of the current gain.
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Specification