Dwayne A Rowland

US Patent:

20170133987, May 11, 2017

Filed:

Oct 17, 2016

Appl. No.:

15/296007

Inventors:

- Woburn MA, US
Michael Lynn GERARD - Cedar Rapids IA, US
Dwayne Allen ROWLAND - Mayodan NC, US
Matthew Lee BANOWETZ - Marion IA, US

International Classification:

H03F 1/32
H03F 3/24
H03F 3/19

Abstract:

Circuits, devices and methods related to multi-mode power amplifiers. A power amplifier (PA) assembly can include a radio-frequency (RF) amplification path having a first stage and a second stage, with each stage including a transistor. The PA assembly can further include a biasing circuit having a first bias path between a supply node and the base of a corresponding transistor. The PA assembly can further include a linearizing circuit implemented as either or both of a second bias path and a coupling path relative to the first bias path. The second bias path can be configured to provide an additional base bias current to the base under a selected condition. The coupling path can be configured to improve linearity of the corresponding transistor operating in a first mode while allowing a ballast resistance to be sufficiently robust for the corresponding transistor operating in a second mode.

US Patent:

20150349715, Dec 3, 2015

Filed:

Nov 3, 2014

Appl. No.:

14/531967

Inventors:

- Woburn MA, US
Dwayne Allen ROWLAND - Mayodan NC, US
Matthew Lee BANOWETZ - Marion IA, US

International Classification:

H03F 1/02
H03F 3/19
H03F 3/21
H03F 1/56

Abstract:

Improved power amplifier (PA) bias circuit having parallel emitter follower. In some embodiments, a bias circuit for a PA can include a first bias path implemented to couple a base node of an amplifying transistor and a supply node, with the first bias path being configured to provide a base bias current to the base node. The PA can further include a second bias path implemented to be electrically parallel with the first bias path between the base node and the supply node. The second bias path can be configured to provide an additional base bias current to the base node under a selected condition.

US Patent:

20150171797, Jun 18, 2015

Filed:

Nov 6, 2014

Appl. No.:

14/534886

Inventors:

- Woburn MA, US
Michael Lynn GERARD - Cedar Rapids IA, US
Dwayne Allen ROWLAND - Mayodan NC, US
Matthew Lee BANOWETZ - Marion IA, US

International Classification:

H03F 1/32
H03F 3/21
H03F 3/193

Abstract:

Improved linearity performance for multi-mode power amplifiers. A power amplifier (PA) assembly can include a radio-frequency (RF) amplification path having a first stage and a second stage, with each stage including a transistor. The PA assembly can further include a biasing circuit having a first bias path between a supply node and the base of a corresponding transistor. The PA assembly can further include a linearizing circuit implemented as either or both of a second bias path and a coupling path relative to the first bias path. The second bias path can be configured to provide an additional base bias current to the base under a selected condition. The coupling path can be configured to improve linearity of the corresponding transistor operating in a first mode while allowing a ballast resistance to be sufficiently robust for the corresponding transistor operating in a second mode.