Title :
Kahn-technique transmitter for L-band communication/radar
Author :
Raab, Frederick H. ; Poppe, Martin C., III
Author_Institution :
Green Mountain Radio Res., Colchester, VT, USA
Abstract :
This Kahn-technique (Envelope Elimination and Restoration) transmitter operates at 1.2 GHz and produces a PEP output of 50 W. It employs a GaN-HEMT class-F RF-power amplifier, class-S modulators, and a digital signal processor. An overall (driver + final) efficiency of 50 percent or more is maintained over the top 6 dB of the output range. The driver and final are operated to maximize overall efficiency and the predistortion corrects for amplitude and phase errors. While originally intended for pulsed radar applications, the transmitter is capable of producing a wide variety of signals with good linearity and average efficiency.
Keywords :
digital signal processing chips; distortion; high electron mobility transistors; phased array radar; radar signal processing; radar transmitters; GaN; GaN-HEMT class-F RF-power amplifier; Kahn-technique transmitter; L-band communication; L-band radar; digital signal processor; frequency 1.2 GHz; phased-array radar; power 50 W; predistortion; pulsed radar; Digital modulation; Digital signal processors; Driver circuits; Error correction; L-band; Linearity; Predistortion; Radar applications; Signal restoration; Transmitters; GaN; Kahn technique; L band; Microwave power amplifiers. class F; predistortion; transmitters;
Conference_Titel :
Radio and Wireless Symposium (RWS), 2010 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
978-1-4244-4725-1
Electronic_ISBN :
978-1-4244-4726-8
DOI :
10.1109/RWS.2010.5434114
