公开(公告)号：EP4502754A1

公开(公告)日：2025-02-05

申请号：EP23188993.2

申请日：2023-08-01

Applicant: u-blox AG

Inventor： Martin, Benjamin ,  Baggini, Barbara ,  Anagnostopoulos, Dimitrios ,  Liakou, Fani ,  Blatter, Samuel

IPC: G05F1/46 ,  H03F3/45

Abstract: In one embodiment a buffer circuit for providing a floating reference signal comprises an operational amplifier comprising a first input, a second input, a third input and an output. The first input represents a non-inverting input and is configured to receive a first input signal. The second input represents another non-inverting input and is configured to receive a second input signal. The third input represents an inverting input. The output forms an output of the buffer circuit. The operational amplifier is configured as a voltage follower. The buffer circuit is configured to provide either the first or the second input signal at its output, such that a lower one of the first and the second input signal is provided as the floating reference signal.

公开(公告)号：EP4407402A1

公开(公告)日：2024-07-31

申请号：EP23153379.5

申请日：2023-01-26

Applicant: u-blox AG

Inventor： Anagnostopoulos, Dimitrios ,  Liakou, Fani ,  Blatter, Samuel ,  Christen, Thomas

IPC: G05F1/565 ,  G05F1/575 ,  G05F1/59

CPC classification number: G05F1/575 ,  G05F1/565 ,  G05F1/59

Abstract: A low-dropout regulator circuit comprises a pass element (PE) coupled between a supply terminal (VDD) and an output terminal (OUT) for providing an output voltage (vout). A control block (CB) is configured to control the pass element (PE) based on a difference between a feedback voltage (vfb), which is derived from the output voltage (vout), and a reference voltage (vref), which determines a target output voltage. The control block (CB) is configured to be selectively operated in a normal mode of operation and in a low-supply mode of operation depending on a selection signal (sel). In the normal mode of operation the control block (CB) is configured to be operated with a first operating range (OR1) for the supply voltage (vin), the first operating range (OR1) excluding the target output voltage, and in the low-supply mode of operation the control block (CB) is configured to be operated with a second operating range (OR2) for the supply voltage (vin), the second operating range (OR2) including the target output voltage and only partially overlapping with the first operating range (OR1).