公开(公告)号：DE69942992D1

公开(公告)日：2011-01-13

申请号：DE69942992

申请日：1999-08-19

Applicant: HARRIS CORP

Inventor： BORODULIN DMITRYI ,  POGGI PETER ,  HU ZHIQUN ,  CABRERA GEORGE ,  DITTMER TIMOTHY ,  ROBERSTON BRYCE

IPC: G05B23/02 ,  H03F1/52 ,  H03F3/60 ,  H03F3/72 ,  H03G3/20 ,  H03G3/30

公开(公告)号：DE60229551D1

公开(公告)日：2008-12-04

申请号：DE60229551

申请日：2002-08-12

Applicant: HARRIS CORP

Inventor： BORODULIN DMITRIY ,  DITTMER TIMOTHY ,  CABRERA GEORGE

IPC: H01P1/00 ,  H01P5/18

Abstract: A directional coupler comprises a coupler circuit board which is mounted substantially perpendicular to the surface of a parent circuit board. First and second upper traces are disposed on the opposing surfaces of the coupler circuit board. The coupling between the upper electrically conductive traces determines the odd mode impedance of the coupler. First and second lower traces are also disposed on opposing surfaces and connected to ground. The upper and lower traces are arranged such that the even mode of the impedance is determined by the coupling between the first upper trace and the second lower trace and the coupling between the second upper trace and the first lower trace.

公开(公告)号：CA2280471C

公开(公告)日：2007-10-09

申请号：CA2280471

申请日：1999-08-18

Applicant: HARRIS CORP

Inventor： CABRERA GEORGE ,  HU ZHIQUN ,  DITTMER TIMOTHY ,  ROBERTSON BRYCE ,  POGGI PETER ,  BORODULIN DMITRIY

IPC: G05B23/02 ,  H03G3/20 ,  H03F1/52 ,  H03F3/20 ,  H03F3/60 ,  H03G3/30

Abstract: A power amplifier system is presented for amplifying an RF input signal. Th e system includes a vector modulator for receiving and modifying an input sign al and providing therefrom a modified signal. The system also includes at least one power amplifier the operation of which is monitored and the vector modulator is controlled in accordance with the monitoring.

公开(公告)号：ITMI930011D0

公开(公告)日：1993-01-08

申请号：ITMI930011

申请日：1993-01-08

Applicant: HARRIS CORP

Inventor： DITTMER TIMOTHY

IPC: H03F1/52 ,  H03F3/60

Abstract: An AC power amplifier is disclosed for amplifying an AC input signal while limiting the current drawn by the amplifier. The amplifier includes at least one transistor having an input circuit for receiving an AC input signal as well as a DC bias voltage and an output circuit connected to the DC voltage source for drawing current therefrom during conductive periods of the transistor. The transistor exhibits the characteristic of being nonconductive when the AC input signal together with the DC bias voltage are less positive than a DC threshold voltage level and is conductive when the AC input signal and the DC bias voltage are together more positive than the DC threshold voltage level whereupon DC current is drawn by the output circuit from the DC voltage source. The DC current is sensed and a sense signal is provided having a magnitude in accordance therewith. The sense signal is compared with a reference current level and a control signal is provided having a value which varies as a function of the comparison. The control signal is decreased in magnitude when the sense current exceeds the reference current level. The DC bias voltage is then decreased to thereby decrease the conductivity of the transistor and thereby limit the magnitude of the DC current to that of the reference current level.