Patent ID: 11949321
Assignee: CIRRUS LOGIC INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A method providing selectable driving of a load in either a pulse-width modulated operating mode or a linear operating mode in an electronic system, comprising:
supplying current to the load from an output stage having a push-pull driver provided by a P-channel transistor coupled between a power supply rail and the load and an N-channel transistor coupled between a power supply return and the load;
selecting between the pulse-width modulated operating mode and the linear operating mode as a selected operating mode;
providing pulse-width modulated drive signals generated from one or more quantizer output signals to a gate of the P-channel transistor and a gate of the N-channel transistor, respectively, only while the selected operating mode is the pulse-width modulated operating mode;
providing linear analog signals to the gates of the P-channel transistor and the N-channel transistor while the selected operating mode is the linear mode;
responsive to the selecting between the pulse-width modulated operating mode and the linear operating mode changing the selected operating mode from the pulse-width modulated operating mode to the linear operating mode, initiating a pre-charge cycle; and
pre-charging the gates of the P-channel transistor and the N-channel transistor during the pre-charge cycle, so that the pre-charging and the linear analog signals are applied to the gates of the P-channel transistor and the N-channel transistor during the pre-charge cycle, wherein during the pre-charge cycle, the pulse-width modulated drive signals are not applied to the gate of the P-channel transistor and the N-channel transistor, so that the outputs of the pre-charging circuit are independent of the one or more quantizer output signals, and wherein the linear analog signals are applied to the gates of the P-channel transistor and the N-channel transistor along with the pre-charging.