Anthony J Keller

US Patent:

45874972, May 6, 1986

Filed:

Dec 24, 1984

Appl. No.:

6/685424

Inventors:

Anthony F. Keller - Chicago IL
Dennis F. Marvin - Roselle IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03B 532
H03B 536

US Classification:

331116R

Abstract:

A low current oscillator/buffer amplifier configuration is disclosed which provides a simple, inexpensive, low power oscillator with reduced harmonic output. Buffer 60 is coupled to the resonant tank circuit 58 of oscillator 50 by means of impedance transform network 70. This technique of tapping directly from the tank provides a buffered output signal having low harmonic content. Furthermore, impedance transform network 70 permits coupling feedback amplifier 52 to buffer amplifier 62 in a totem-pole amplifier stage configuration. This feature provides a significant current savings over conventional oscillator/buffer circuits. The instant invention is particularly well adapted for use as reference frequency oscillators in portable radio applications.

US Patent:

40017249, Jan 4, 1977

Filed:

Jun 25, 1975

Appl. No.:

5/590245

Inventors:

Anthony F. Keller - Chicago IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03B 536
H03C 322

US Classification:

331116R

Abstract:

A Colpitts type oscillator having a tank circuit including a crystal, a voltage variable capacitor and split capacitors with a first inductance including a coil connected in series with the crystal and a second inductance including a coil connected in parallel with the series connected coil and crystal and a second coil connected in series with one of the capacitors and the series combination connected in parallel with the first coil of the second inductance, said first and second inductances operating to neutralize the C. sub. o of the crystal, providing an impedance transformation between the crystal and the tank circuit, and improving the stability of the oscillator over a substantially increased warp range.

US Patent:

54934869, Feb 20, 1996

Filed:

Mar 17, 1995

Appl. No.:

8/406281

Inventors:

Lawrence E. Connell - Naperville IL
Anthony F. Keller - Chicago IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H02M 318

US Classification:

363 60

Abstract:

What is described is a high efficiency voltage doubler (100). The high efficiency voltage doubler (100), has a charge-pump capacitor (30), an inverter (18), a coupling capacitor (24), a complementary switch pair (16), a DC biasing circuit (102), a charging circuit (106), and an input circuit (108). This structure is adapted for use in an integrated circuit, and provides the advantage of maximizing voltage doubled power output and minimizing current consumption with a minimal number of components.

US Patent:

42543827, Mar 3, 1981

Filed:

Mar 19, 1979

Appl. No.:

6/021524

Inventors:

Anthony F. Keller - Chicago IL
Albert V. Kraybill - Arlington Heights IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03B 536
H03B 504

US Classification:

331116R

Abstract:

An integratable circuit is utilized for generating a temperature varying control voltage to be applied to a varactor diode to temperature compensate a crystal oscillator. The temperature compensating circuit has a middle range circuit for creating a substantially linear current versus temperature variation in a middle temperature range, a cold-temperature range circuit operative below a predetermined temperature for creating a non-linear current versus temperature variation a hot-temperature range circuit operative above a predetermined temperature for creating a non-linear current versus temperature variation and circuitry for summing said currents and generating a voltage proportional to the current sum. The control circuit, which requires a regulated supply voltage, uses a diode string and differential amplifiers to generate the desired current versus temperature variation.

US Patent:

54812291, Jan 2, 1996

Filed:

Nov 29, 1994

Appl. No.:

8/346452

Inventors:

Lawrence E. Connell - Naperville IL
Timothy J. Collins - Downers Grove IL
Anthony F. Keller - Chicago IL
Dennis F. Marvin - Carol Stream IL
Michael L. Bushman - Hanover Park IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03L 102

US Classification:

331158

Abstract:

A temperature compensated crystal oscillator (10), has a crystal oscillator circuit (12), a voltage controlled reactance element (30), a temperature compensation network (50), and a programmable DC-DC converter network (60) having an output (62) connected to the voltage controlled reactance element (30), or the temperature compensation network (50) or both. The DC-DC converter network (60) provides the capability of operating over an extended voltage range, by increasing the supply voltage to a level necessary to operate the voltage controlled reactance element (30). Much of this structure is adapted for use in an integrated circuit, and provides the advantages of minimizing power and current consumption.

US Patent:

39709663, Jul 20, 1976

Filed:

Apr 25, 1975

Appl. No.:

5/571663

Inventors:

Anthony Francis Keller - Chicago IL
Dennis Fisher Marvin - Bensenville IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03B 504
H03B 536

US Classification:

331116R

Abstract:

A circuit for generating a temperature varying control voltage which is applied to a varactor diode to temperature compensate a crystal oscillator is disclosed. The circuit produces a substantially linear voltage versus temperature variation, including a point of inflection, in a middle temperature range, and a substantially non-linear voltage versus temperature variation in hot and cold temperature ranges. The control voltage versus temperature characteristic also undergoes a change in slope polarity in both the hot and cold temperature ranges. The temperature compensating circuit has a middle range circuit for independently creating the substantially linear variation in the middle temperature range, a cold range circuit operative below a predetermined temperature for creating the desired variation in the cold temperature range, and a hot temperature circuit operative above a predetermined temperature for creating the desired temperature variation in the hot temperature range. Each temperature range circuit includes a thermistor and a transistor which together control the operative range and the magnitude of the temperature variation contributed by each of the circuits.

Address:

1425 Cherry Ln, Crystal Lake, IL 60014

VIN:

5GTDN13E778230395

Make:

HUMMER

Model:

H3

Year:

2007