Yuanfang Li

US Patent:

8331072, Dec 11, 2012

Filed:

Aug 25, 2010

Appl. No.:

12/868652

Inventors:

Huibo Liu - San Jose CA, US
David Castaneda - Morgan Hill CA, US
Yuanfang Li - Irvine CA, US

Assignee:

Maxim Integrated Products, Inc. - Sunnyvale CA

International Classification:

H02H 9/02

US Classification:

361 939, 361 937

Abstract:

A driver circuit uses a feedback loop having a programmable timer and timer logic to adjust a slew rate delay period used to accommodate slewing current when charging or discharging a load capacitor, and to increase the current limit during the slew rate delay period by selecting a larger input current reference value. Increasing the current limit provides for a faster settling time. The value of each input current reference value can be programmed. The programmable timer and the timer logic can be configured to coordinate the slew rate delay period and the selected input current reference value. The slew rate delay period can be adjusted based on which input current reference value is applied.

US Patent:

8581766, Nov 12, 2013

Filed:

Jan 17, 2012

Appl. No.:

13/351570

Inventors:

Yuanfang Li - Irvine CA, US
David Castaneda - Morgan Hill CA, US
Ling Liu - Sunnyvale CA, US

Assignee:

Maxim Integrated Products, Inc. - San Jose CA

International Classification:

H03M 1/78

US Classification:

341154, 341145

Abstract:

A system includes an NL bit digital to analog converter (DAC) ladder module having NL ladder resistors connected in parallel, NL series resistors connected in series between the NL ladder resistors, and a plurality of switches. NL is an integer greater than one. Adjacent pairs of the plurality of switches are connected in series with respective ones of the ladder resistors. On resistances of each of the plurality of switches are approximately equal. A switch control module provides a plurality of switch control signals to respective ones of the plurality of switches.

US Patent:

20120200442, Aug 9, 2012

Filed:

Feb 8, 2011

Appl. No.:

13/023093

Inventors:

Yuanfang Li - Irvine CA, US
David Castaneda - Morgan Hill CA, US
Daniel Alexander - Chandler AZ, US

Assignee:

Maxim Integrated Products, Inc. - Sunnyvale CA

International Classification:

H03M 1/78

US Classification:

341154

Abstract:

A system includes an N bit sub-binary radix digital-to-analog converter (DAC) that converts an m bit digital input signal to an analog output signal, where m and N are integers greater than or equal to 1 and N>m. A radix conversion module determines a code ratio, the code ratio being a ratio of a total number of available monotonic codes to 2, and performs radix conversion on the m bit digital input signal based on the code ratio.