Darrell E Davis

US Patent:

6768353, Jul 27, 2004

Filed:

Jul 31, 2002

Appl. No.:

10/208959

Inventors:

Cesar Carralero - Miramar FL
Darrell Davis - Sunrise FL
Raul Salvi - Boca Raton FL

Assignee:

Freescale Semiconductor, Inc. - Austin TX

International Classification:

H03K 2100

US Classification:

327115, 377 47

Abstract:

A prescaler ( ) includes a frequency divider ( ) having an input node ( ) and a divider output ( ). The frequency divider is coupled to a clock signal and has a predetermined divisor. Series-coupled delay elements ( ) are coupled to the divider output and to the clock signal. Each delay element includes a delayed output ( ) and adds a delay equal to the clock period at the delayed output. The prescaler also includes transmission gates ( ), each transmission gate coupled between the input node and the delayed output of a corresponding one of the delay elements. When one of the transmission gates is enabled and couples the delayed output of an nth one of the delay elements to the input node, the divider output frequency equals the clock frequency divided by the predetermined divisor plus n.

US Patent:

8237573, Aug 7, 2012

Filed:

Nov 15, 2010

Appl. No.:

12/946851

Inventors:

Saket S. Bhatia - Santa Clara CA, US
Darrell E. Davis - Sunrise FL, US
Ankush S. Bhatia - Mumbai, IN

International Classification:

G08B 23/00

US Classification:

3405735, 3405731, 340540

Abstract:

In one example embodiment, an alarm unit for monitoring or detecting presence of an analyte on an analyte sensor comprises a square plastic casing protecting the alarm electronics portion and including a signal processing means, a clip attachment means configured to be separated and attached from the casing and used to attach the unit to clothing. The clip attachment has enough clearance to be used with thick articles of clothing including diapers and has a set of teeth frictionally held against a rubber strip portion located on the casing back so as to also enable secure attachment to very thin articles of clothing. The alarm unit may further comprise a three-way switch located externally for easy alarm chime and alarm volume selection. Interdependent modes of operation may enable the signal processing means to control the alarm unit operation and features including low power indication, improper cable plug installment, three-way switch deactivation during Monitor mode, and a snooze/reset feature by which the alarm is disabled temporarily so that, as an example, a user can focus on running to the bathroom where the device is used to treat enuresis.

US Patent:

8253573, Aug 28, 2012

Filed:

Mar 25, 2010

Appl. No.:

12/661823

Inventors:

Saket Subash Bhatia - Santa Clara CA, US
Darrell Eugene Davis - Sunrise FL, US

International Classification:

G08B 23/00

US Classification:

3405735, 340540, 3405731

Abstract:

An alarm unit for monitoring or detecting presence of an analyte on a separate sensor portion. The present invention comprises only the alarm unit and its means for attachment to a user's clothing. A square plastic casing protects the alarm electronics portion including a signal processing means. A large clip attachment means is included that is easily separated and attached from the casing and is used to attach the unit to clothing and which has enough clearance to be used with thick articles of clothing including diapers and which has a set of teeth frictionally held against a rubber strip portion located on the casing back so as to also enable secure attachment to very thin articles of clothing. A three-way switch is located externally for easy alarm chime and alarm volume selection. Interdependent modes of operation enable the signal processing means to control the alarm unit operation and features including low power indication, improper cable plug installment, three-way switch deactivation during Monitor mode, and a snooze/reset feature by which the alarm is easily disabled temporarily so that, as an example, a user can focus on running to the bathroom where the device is used to treat enuresis.

US Patent:

20070057737, Mar 15, 2007

Filed:

Sep 14, 2005

Appl. No.:

11/226081

Inventors:

Darrell Davis - Sunrise FL, US
Mahibur Rahman - Lake Worth FL, US

International Classification:

H03L 7/00

US Classification:

331017000

Abstract:

A modulation distortion compensation system for a phase locked loop includes a compensation function () that is arranged to be coupled to a tuning voltage signal () corresponding to a tuning voltage from the phase locked loop and is configured to select a filter response from a plurality of filter responses, where the filter response corresponds to the tuning voltage. The distortion compensation system further includes a filter that is configured to distort a modulation signal in accordance with the filter response and provide a distorted signal suitable for being coupled to a modulation input of a feedback divider included with the phase locked loop, wherein the distorted signal when used by the feedback divider will facilitate modulation and compensation of a radio frequency signal provided by the phase locked loop. Various environmental measurements in addition to the tuning voltage can also be used in selecting the filter response.

US Patent:

20110198222, Aug 18, 2011

Filed:

Nov 15, 2010

Appl. No.:

12/946853

Inventors:

Saket S. Bhatia - Santa Clara CA, US
Darrell E. Davis - Sunrise FL, US
Ankush S. Bhatia - Mumbai, IN

Assignee:

Theos Medical Systems, Inc. - Santa Clara CA

International Classification:

G01N 27/403

US Classification:

20440301

Abstract:

An electrolyte sensor that uses conductive elastomer electrodes. Examples of the intended analytes for sensor use include those found in urine, saliva, blood, feces and spinal fluid, although other analytes exist for electrolyte detection. Conductive elastomer trace electrodes are separated by a gap or channel which can be bridged by an electrolyte and thereby complete an electrical circuit to an alarm or other circuitry. Gap or channel distances vary the level of electrical resistance associated with detecting certain analytes.

US Patent:

45120358, Apr 16, 1985

Filed:

May 16, 1983

Appl. No.:

6/495307

Inventors:

Alan M. Victor - Cooper City FL
Darrell E. Davis - Sunrise FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03J 718
H04B 116

US Classification:

455165

Abstract:

A method of programming a ROM for a multiple conversion frequency synthesizer provides a mechanism for avoiding receiver self-quieting. The method includes the steps of searching for frequencies which cause potential receiver self-quieting responses and selecting a second local oscillator frequency suitable for avoiding receiver self-quieting. A single bit of a ROM is used to represent possible second local oscillator frequencies synthesized by the frequency synthesizer which provide either high-side or low-side injection to the second mixer. Finally, the method includes the step of encoding the single second local oscillator frequency determining bit of the ROM appropriately for selecting the local oscillator frequency which avoids receiver self-quieting.

US Patent:

49143212, Apr 3, 1990

Filed:

Apr 10, 1989

Appl. No.:

7/335341

Inventors:

Darrell E. Davis - Sunrise FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03K 1908

US Classification:

307446

Abstract:

A BIMOS lever convertor (10) comprises a differential circuit having a common biasing network (14). A MOS transistor (16) in one portion of the differential circuit receives a MOS level input signal (32) and provides an ECL level output signal (34). The other portion of the differential circuit includes a bipolar transistor (18) that is biased by the MOS transistor (16). The bipolar transistor (18) operates to provide a complementary ECL level output signal (34') so as to provide a single ended MOS to differential ECL interface suitable for integration in an I. C.

US Patent:

44019505, Aug 30, 1983

Filed:

Dec 5, 1980

Appl. No.:

6/213285

Inventors:

Darrell E. Davis - Sunrise FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03F 345

US Classification:

330255

Abstract:

A low-voltage, complementary symmetry amplifier arrangement is disclosed which functions effectively on supply voltages down to one volt DC. The amplifier is especially suited for audio processing applications in hand-held personal electronics apparatus, such as pocket radio receivers. The circuit configuration is easily implemented in integrated circuit form and operates efficiently on class B operation with its attendant advantages. The amplifier arrangement is characterized by the use of current sources in the collector and emitter circuits of a differential amplifier and thereby employs current ratios instead of the more conventional voltage levels to selectively control the conduction of associated output devices.