Daniel Wayne Alexander

US Patent:

6369742, Apr 9, 2002

Filed:

Nov 1, 2000

Appl. No.:

09/704025

Inventors:

Daniel D. Alexander - Gilbert AZ
Syed Amir Aftab - Phoenix AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03M 136

US Classification:

341159, 341155

Abstract:

A device and technique for selective over-ranging provides for the folding of signals in an input signal range such that the folded signals in the center of the input signal range are folded N times while the folded signals at the lower and upper extremes of the input signal range are folded NF +1 times. One embodiment includes an over-ranging lower pre-amplifier group ( ), a center pre-amplifier group ( ) and an over-ranging upper pre-amplifier group ( ).

US Patent:

20100149121, Jun 17, 2010

Filed:

Nov 17, 2009

Appl. No.:

12/620430

Inventors:

Daniel D. Alexander - Gilbert AZ, US
Timothy L. Blankenship - Austin TX, US
Yassar A. Ali - Sunnyvale CA, US
Andrew Chan - Fremont CA, US
Feihua Zhang - Gilbert AZ, US

Assignee:

MAXIM INTEGRATED PRODUCTS, INC. - Sunnyvale CA

International Classification:

G06F 3/041

US Classification:

345173, 345558

Abstract:

System and method for substantially reducing an involvement of an applications processor in receiving data from a touchscreen display. In one aspect, the system includes a controller may be configured in an autonomous mode where it automatically measures the touchscreen display based configuration information received from the applications processor, determines notable events based on the measurement data, stores data and event identifiers related to the notable events in a memory, and sends a notification to the applications processor when event data is available In another aspect, the system includes a controller that filters user interactions events and transmits data related to only notable events to the applications processor. Because of the autonomous and event filtering operations of the touchscreen controller, there are substantially less communications between the controller and the applications processor. This improves the speed and efficiency of the applications processor.

US Patent:

60878738, Jul 11, 2000

Filed:

Jul 21, 1998

Appl. No.:

9/119945

Inventors:

Daniel D. Alexander - Gilbert AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03K 3037

US Classification:

327206

Abstract:

A switched capacitor differential comparator (10) for receiving input signals which includes hysteresis circuitry (40, and 42) and a switch (43) responsive to timed clocking pulses occurring during alternating reset and comparison periods for application of a hysteresis current during a reset period of the differential comparator which current is injected into an applicable one of a pair of load devices (22, 24) to produce a hysteresis voltage offset at a selected one of the differential inputs (30, 32) which is stored during the reset period but removed during the next comparison period so that the hysteresis voltage is not canceled but remains superimposed on the stored input signals during the next comparison period to introduce hysteresis to influence the current output decision of the comparator circuit based on the decision of the comparator resulting from the previous comparison period.

US Patent:

59364696, Aug 10, 1999

Filed:

Aug 4, 1997

Appl. No.:

8/905524

Inventors:

Daniel D. Alexander - Gilbert AZ
David J. Anderson - Scottsdale AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03F 345

US Classification:

330258

Abstract:

A circuit and method control the common-mode potential at an output (17, 18) of a fully differential amplifier (32) by feeding forward a common-mode correction signal through the amplifier. An input signal (V. sub. IN+ -V. sub. IN-) is amplified in the amplifier to produce a differential output signal (V. sub. O- -V. sub. O+) at the output. A common potential of the differential inputs (37, 38) of the amplifier is sensed with a transistor (54, 56) biased to a reference voltage (V. sub. CM) and amplified through the amplifier to produce a common-mode correction signal to offset a common-mode component of the differential output signal. A feedback circuit (33-36) is used to develop the common potential from the common-mode component.

US Patent:

59296623, Jul 27, 1999

Filed:

Nov 4, 1997

Appl. No.:

8/963627

Inventors:

Daniel D. Alexander - Gilbert AZ
David J. Anderson - Scottsdale AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03K 522
H03K 302
H03K 3037

US Classification:

327 67

Abstract:

A comparator (12) and method compare first and second signals (V. sub. IN+, V. sub. IN-) to provide an output signal (V. sub. O, V. sub. OB). A transistor (43) couples a supply terminal (64, 66) of the comparator to a power supply (V. sub. DD) to enable the comparator for comparing the first and second signals. When the output signal is valid, it turns off the transistor to isolates the supply terminal from the power supply. As a result, power is reduced and a change in the first and second signals is prevented from changing the output signal. When the transistor turns off, a charge is trapped on the supply terminal that unbalances the comparator and causes a comparison error. A balanced condition is restored with a discharge circuit (31-33) coupled to the supply terminal to alter the charge when a control signal (RESET) is applied.

US Patent:

20190317868, Oct 17, 2019

Filed:

Apr 15, 2019

Appl. No.:

16/384089

Inventors:

- San Jose CA, US
Brian A. Miller - Gilbert AZ, US
Daniel J. Black - Tempe AZ, US
Daniel David Alexander - Mesa AZ, US
Hang Fung Yip - Chandler AZ, US
Jiuhui Wang - Gilbert AZ, US

Assignee:

Maxim Integrated Products, Inc. - San Jose CA

International Classification:

G06F 11/16
G05B 23/02

Abstract:

Described herein are systems and methods for real-time fault detection in electrical circuits. Various embodiments provide a fault detection circuit that uses a resistor network that is controlled to detect an internal current leak in multiple directions, e.g., to ground or to a power supply. The magnitude of the leakage current may be estimated from voltage measurements at voltage pins. In addition, as part of circuit diagnostics, open and short circuit fault conditions may be identified by using current sources and measuring deflections at the voltage pins.