A new high-dynamic range dual-loop power-to-current amplifier

The design and performance of a balanced amplifier with a dual differential feedback loop in a high-frequency BiFET (bipolar-field effect transistor) process (f/sub T/=3 GHz) is presented. By means of this dual feedback loop, a linear, accurately known input impedance is obtained, combined with a high-output impedance. The noise figure of the realized amplifier is lower than 3 dB. The amplifier is especially intended for low-noise, low-distortion termination of antennas, cables, or filters and for driving bipolar switching mixers up to frequencies well above 100 MHz.<
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