公开(公告)号：US10854306B1

公开(公告)日：2020-12-01

申请号：US16576216

申请日：2019-09-19

Applicant: Analog Devices, Inc.

Inventor： Howard R. Samuels ,  Long Pham

IPC: G11C17/18 ,  G11C7/06 ,  G11C7/10 ,  G11C17/16 ,  G11C7/08 ,  G11C29/02

Abstract: A state of one or more fuses can be determined using a common-gate FET device to read reference information and test information from a fuse bank. In an example, the FET device can be selectively diode-connected using a first switch that responds to a control signal, and a signal-storing capacitor can be connected to the gate terminal of the FET device. The capacitor can store information about a reference signal when the first switch is closed and a first input signal is applied at a source node of the FET device. When the first switch is open, a second input signal can be applied at the source node of the FET device, and an output signal at the drain node of the FET device can indicate a magnitude relationship between the first input signal and the reference signal. In an example, the second input signal can indicate a state of a fuse.

公开(公告)号：US10819365B1

公开(公告)日：2020-10-27

申请号：US16783442

申请日：2020-02-06

Applicant: Analog Devices, Inc.

Inventor： Khiem Quang Nguyen ,  Long Pham

IPC: H03M1/80 ,  H03M1/74

Abstract: Improved switching techniques for controlling three-level current steering DAC cells are disclosed. The techniques include decoupling two current sources, implemented as field-effect transistors (FETs), of a DAC cell both from their respective bias sources and from a load for converting a zero digital input, where the decoupling is performed in a certain order. The techniques also include coupling the current sources to their respective bias sources and to the load for converting a non-zero digital input, where the coupling is also performed in a certain order. The certain order of decoupling and coupling the bias sources and the load to the current sources of a DAC cell are based on the phenomenon of current memory in FETs. Utilizing current memory when operating a DAC cell may allow reducing power consumption while preserving the high performance properties of a three-level current steering DAC.