公开(公告)号：US20190363630A1

公开(公告)日：2019-11-28

申请号：US15986346

申请日：2018-05-22

Applicant: Analog Devices Global Unlimited Company

Inventor： Christopher Peter Hurrell ,  Derek J. Hummerston

IPC: H02M3/07 ,  H03F3/45

Abstract: Techniques for supplying a bias current to a load are provided. In certain examples, a circuit can include a level-shift capacitance, a current source, and a load configured to receive a bias current in a first state of the circuit. The current source and the level-shift capacitance can be coupled in series between the load and a supply voltage in the first state. In some examples, during a second state of the circuit, the level-shift capacitance can receive charge, and can be isolated from one of the load or the current source.

公开(公告)号：US20180167067A1

公开(公告)日：2018-06-14

申请号：US15375906

申请日：2016-12-12

Applicant: Analog Devices Global

Inventor： Christopher Peter Hurrell ,  Sanjay Rajasekhar

IPC: H03K17/693 ,  H02J7/00

CPC classification number: H02J7/0013 ,  H02J7/345 ,  H03K17/005 ,  H03K17/0416 ,  H03K17/693

Abstract: A pre-charge circuit is provided for pre-charging the input node of a capacitive component to which the multiplexer output is fed to a charge level that is close to or approximates the signal output level of the multiplexer when its output is next switched. In order to reduce the level shifting burden on the amplifier in the pre-charge circuit, each pre-charge circuit input channel has a respective capacitor that is able to be switched in and out of series with the respective multiplexer channels, such that the respective capacitors track the signal levels on the multiplexer channels. The provision of the corresponding capacitors for each MUX channel reduces the input current to the pre-charge amplifier, and allows for the level shifting burden to be taken by the capacitors, leading to more stable and lower power operation.