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A 245 GHz sensor system for gas spectrosopy is presented, which includes a SiGe receiver (RX), a SiGe transmitter (TX), and a 0.6 m long gas absorption cell between the TX and RX. The integrated local oscillators of the RX and the TX are controlled by two external PLLs, whose reference frequencies are swept with constant frequency offset for a low IF of the RX. The RX consists of a differential LNA,...
A five-stage differential SiGe low noise amplifier (LNA) in cascode topology is presented. Transformer coupling is used between the stages to obtain inter-stage matching. The single ended input and output of the LNA are realized by baluns. The LNA has 18 dB of gain at 245 GHz and a 3 dB bandwidth of 8 GHz. A noise figure of NF of the LNA at 245 GHz was measured by the -factor...
The design of an integrated CMOS cascoded operational amplifier with two differential input stages is described. By using the nested Miller compensation the stability of the operational amplifier is ensured. The layout has been created automatically by using the ALADIN tool [6–9] and prototype circuits have been fabricated. The small signal model for the amplifier is depicted and the test results...
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