Richard E Stone

US Patent:

53370201, Aug 9, 1994

Filed:

Mar 12, 1993

Appl. No.:

8/030789

Inventors:

Earl A. Daughtry - Lawrenceville GA
Richard M. Stone - Duluth GA

Assignee:

Matsushita Communication Industrial Corporation of America - Peachtree City GA

International Classification:

H03G 330

US Classification:

330279

Abstract:

An automatic level control circuit for radio frequency power amplifiers which is immune to temperature and power supply induced variations. The level control circuit (42) employs a detector/comparator comprising a matched transistor pair (55) operating as a detecting differential amplifier to compare a reference signal (63) to the output power signal (83). A second amplifier (60) receives the differential output signals from the detecting amplifier and provides a power level control signal (97) to the power amplifier, thereby causing the power amplifier to produce the desired output power level.

US Patent:

56598840, Aug 19, 1997

Filed:

Feb 10, 1995

Appl. No.:

8/387058

Inventors:

Earl A. Daughtry - Lawrenceville GA
Christopher S. Quire - Alpharetta GA
Mark A. Ruff - Cumming GA
Richard M. Stone - Suwanee GA

Assignee:

Matsushita Communication Industrial Corp. of America - Peachtree City GA

International Classification:

H04B 1700

US Classification:

455 671

Abstract:

A method and an apparatus for compensating for aging and temperature of the crystal in a crystal oscillator. An RF signal which is transmitted by a mobile telephone switching office (MTSO) (108) and received by the antenna (118). The signal transmitted by the MTSO (108) serves as an external reference. A crystal-controlled main oscillator/time base generator (134) provides a local reference frequency to the converters (120) and provides a time base signal to a counter (136). A controller (112) reads an aging correction value from a memory and provides a frequency control signal to the main oscillator (134). The converters (120) convert the received RF signal to an IF frequency. A limiter (122) provides a limited IF signal to the counter (136). Counter (136) counts the number of cycles of the limited IF signal that appear in a cycle of the time base signal. A controller (112) compares this measured count to a reference count and the count error is determined.

US Patent:

58753885, Feb 23, 1999

Filed:

Jul 18, 1997

Appl. No.:

8/896697

Inventors:

Earl A. Daughtry - Lawrenceville GA
Christopher S. Quire - Alpharetta GA
Mark A. Ruff - Cumming GA
Richard M. Stone - Suwanee GA

Assignee:

Matsushita Communication Industrial Corporation of America - Peachtree GA

International Classification:

H04B 116

US Classification:

455 671

Abstract:

A method and an apparatus for compensating for aging and temperature of the crystal in a crystal oscillator. An RF signal which is transmitted by a mobile telephone switching office (MTSO) (108) and received by the antenna (118). The signal transmitted by the MTSO (108) serves as an external reference. A crystal-controlled main oscillator/time base generator (134) provides a local reference frequency to the converters (120) and provides a time base signal to a counter (136). A controller (112) reads an aging correction value from a memory and provides a frequency control signal to the main oscillator (134). The converters (120) convert the received RF signal to an IF frequency. A limiter (122) provides a limited IF signal to the counter (136). Counter (136) counts the number of cycles of the limited IF signal that appear in a cycle of the time base signal. A controller (112) compares this measured count to a reference count and the count error is determined.

US Patent:

57641072, Jun 9, 1998

Filed:

Aug 27, 1996

Appl. No.:

8/697572

Inventors:

Richard M. Stone - Suwanee GA

Assignee:

Matsushita Communication Industrial Corporation of America - Peachtree City GA

International Classification:

H03G 330

US Classification:

330279

Abstract:

A circuit for automatically limiting fluctuations in the output power level of a transmitter by providing a feedback control signal which is based on the output power level. An RF signal (100) is input to a terminal of the RF detector (200). When the RF signal (100) is more negative than a bias voltage (209), a capacitor (208) begins charging. When the RF signal (100) becomes more positive than the bias voltage (209), the voltage in the charged capacitor (208) is added to the RF signal (100) and then averaged by the capacitors (214 and 206) to form voltage VE. Voltage VE in conjunction with the current setting circuitry (230) establishes a tail current (235) which is comprised of transistor (216) current (225) and the current from the RF detector (200). The tail current (235) tends to remain constant whereas the transistor current (225) is responsive to power changes in the RF signal (100) and represents the difference between the output power level of the RF power amplifier and the specified reference (110). The current (235) is amplified by current amplifier (220) to provide the feedback control signal (120).