公开(公告)号：US20250132730A1

公开(公告)日：2025-04-24

申请号：US18491252

申请日：2023-10-20

Applicant: CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD.

Inventor： Payel Mukherjee ,  Rupesh Khare ,  Ambreesh Bhattad

IPC: H03F1/02 ,  H03F3/213

Abstract: An amplifier circuit and its method of operation reduce leakage in the output stage of the under no-load or low-load conditions. The amplifier circuit includes an amplifier stage that generates an output signal, an output stage including an output device, a pre-driver device coupled to a gate of the output device, and a feedback connection from the output device to the amplifier stage. A power supply rail of the amplifier is provided by a first power supply voltage, and the output signal of the amplifier stage is coupled to an input of the pre-driver device. A power supply rail of the output stage is provided by a second power supply voltage having a magnitude less than the first power supply voltage. An increased voltage magnitude at the output stage is compensated by driving a channel field potential of the output device above the second power supply voltage.

公开(公告)号：US20250132729A1

公开(公告)日：2025-04-24

申请号：US18492853

申请日：2023-10-24

Applicant: CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD.

Inventor： Rupesh Khare ,  Ambreesh Bhattad ,  Jithender Tirunahari

IPC: H03F1/02 ,  H03F3/04

Abstract: An amplifier circuit employing an output stage current mirror has improved power efficiency and stability. The amplifier circuit includes one or more amplifier stages connected in cascade. The one or more amplifier stages receive an analog input signal and generate a drive signal. The current mirror output stage includes an output device and a diode-connected mirror device. A gate of the output device is coupled to a gate of the mirror device, and the mirror device is coupled to an output of the one or more amplifier stages to receive the drive signal. The current mirror output stage provides an adjustable ratio by activation of one more additional devices that are selectively coupled to a mirror arm and an output arm of the current mirror output stage, decreasing the pre-driver power dissipation for high current levels, and decreasing the output capacitance at lower current levels, improving stability.