Thinh Thuc Do

US Patent:

6587014, Jul 1, 2003

Filed:

Jan 25, 2001

Appl. No.:

09/769709

Inventors:

Thinh Dat Do - Fountain Valley CA
Thuan Nam Tran - Fountain Valley CA
Charles R. Gentzler - Thousand Oaks CA

Assignee:

Paradigm Wireless Communications LLC - Irvine CA

International Classification:

H01P 110

US Classification:

333101, 333105

Abstract:

A switch assembly has a housing and a plurality of controllable switches. The housing has a plurality of input ports and an output port and the plurality of individually controllable switches is arranged within the housing. Each switch has an open position and a closed position and is coupled to one of a plurality of input ports of the housing and a common summing junction within the housing. Each input port receives a coherent radio frequency (RF) signal. The output port is coupled to the common summing junction and outputs a sum signal that includes at least one of the RF signals received at the common summing junction when a switch is in the closed position. The switch assembly may further include impedance matching lines that transform a reference impedance value to a higher value prior to switching and an impedance transformation line that provides for the reference impedance value at a distal end of the impedance transformation line. The impedance transformation lines may be located outside the housing, inside the housing or inside and outside the housing. Further, the switch assembly may include at least one matching stub associated with the output port.

US Patent:

20020005755, Jan 17, 2002

Filed:

Dec 21, 2000

Appl. No.:

09/746440

Inventors:

Ki Nam - Newport Beach CA, US
Thinh Do - Fountain Valley CA, US

International Classification:

H03G003/20

US Classification:

330/133000, 333/014000

Abstract:

Generally, the invention relates to a method and apparatus to improve the performance of multi-stage radio frequency linear power amplifiers. More particularly, the present invention discloses a cascaded gain expansion stage and gain compression stage at differing bias levels to produce an amplifier with superior linearity and lower intermodulation distortion and adjacent channel power than any single stage by alone.