Andrew M Dodd

US Patent:

6930547, Aug 16, 2005

Filed:

Aug 5, 2003

Appl. No.:

10/634600

Inventors:

Rajiv Chandrasekaran - Basking Ridge NJ, US
Andrew Dodd - Martinsville NJ, US

Assignee:

Andrew Corporation - Orland Park IL

International Classification:

H03F001/26

US Classification:

330124R, 330149

Abstract:

An input signal having amplitude information is pre-distorted and converted into two pre-distorted signals without amplitude information. The two pre-distorted signals are separately amplified and then recombined to generate a linearized amplified output signal having amplitude information. The pre-distortion and conversion may be implemented using a pre-distorter and a LINC modulator. Alternatively, the pre-distortion and conversion may be implemented in circuitry that combines the functions of a pre-distorter and a LINC modulator. The amplified, pre-distorted signals are preferably combined using circuitry that provides at least some impedance matching, such as a transformer or a transmission line tee with transmission line stubs.