Abstract
The design and test results of a space qualified dual linearized channel amplifier (DLCAMP) developed for Ku-band TWTA commercial satellite applications are presented in this paper. The unit consists of two independent identical linearized channel amplifiers and therefore offers redundant configurations. The linearizer utilizes a diode bridge and can be switched off electronically so that the LCAMP offers also the functions of a conventional channel amplifier. Electronically switching on of the linearizer improves, in addition, the gain compression of the connected TWTA at saturation by at least 2 dB, reduces its phase shift to less than ± 10 degrees and considerably reduces its intermodulation products. The LCAMP has a gain of 65 dB, 31 dB gain setting, 15 dB ALC setting range with 0.5 dB / step and additional 8 dB output power setting range with 0.5 dB / step in both cases for linearizer active or inactive. The DLCAMP is a part of the electronic power conditioner (EPC) of the travelling wave tube improving the EMC and reducing the mounting area. The TWTs may be connected to the LCAMPs either directly or via a hybrid network for redundant or combined mode configurations.
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