DAVID A JOHNSON
Electrician in Wilmington, MA
License number
Massachusetts 23919
Issued Date
Aug 1, 1977
Expiration Date
Jul 31, 2019
Type
Journeyman Electrician
Address
Address
Wilmington, MA 01887
Personal information
See more information about DAVID A JOHNSON at radaris.comName
Address
Phone
49 Maple Ave, Bridgewater, MA 02324
4 Briarcliff St, Worcester, MA 01602
4 Kathleen Dr, Beverly, MA 01915
4 Madeline Ter, Tyngsboro, MA 01879
4 Mount Cushing Ter #2, Dorchester, MA 02125
Professional information
Efficient Multiple-Band Antenna Switching Circuit
US Patent:
7194241, Mar 20, 2007
Filed:
Dec 4, 2003
Appl. No.:
10/729028
Inventors:
Norbert A. Schmitz - Salem NH, US
Mark N. Ayvazian - Wilmington MA, US
Philip H. Thompson - Solon IA, US
Edward F. Lawrence - Marion IA, US
Darryl E. Evans - Nashua NH, US
David M. Johnson - Wilmington MA, US
Mark N. Ayvazian - Wilmington MA, US
Philip H. Thompson - Solon IA, US
Edward F. Lawrence - Marion IA, US
Darryl E. Evans - Nashua NH, US
David M. Johnson - Wilmington MA, US
Assignee:
Skyworks Solutions, Inc. - Irvine CA
International Classification:
H04B 1/44
US Classification:
455 83, 455 82, 455 78, 4555521, 4555757, 333103, 333133, 333126, 370280
Abstract:
An exemplary antenna switching circuit comprises first, second, third and fourth switches. The first switch is activated by a first control signal for establishing a connection between a first transmit port and an antenna; the second switch is activated by a second control signal for establishing a connection between a second transmit port and the antenna; the third switch is activated by a third control signal for establishing a connection between a first receive port and the antenna; and the fourth switch is activated by the third control signal for establishing a connection between a second receive port and the antenna. With this arrangement, the first receive port and the second receive port are simultaneously connected to the antenna when the third switch and the fourth switch are activated by the third control signal.