ANALOG DEVICES DC1120A

DC1120A is a LT5538IDD 40MHz to 3.8GHz 75dB dynamic range log detector demonstration board. The LT5538 is a 40MHz to 3.8GHz monolithic logarithmic RF power detector capable of measuring RF signals from -75dBm to 10dBm. The RF signal in a decibel scale is precisely converted into DC voltage on a linear scale. The wide input dynamic range is achieved using cascaded RF detectors and RF limiters. Their outputs are summed to generate an accurate linear DC voltage proportional to the input RF signal in dBm. The output is buffered with a low impedance driver. The LT5538 delivers superior temperature stabile output (within ±1dB over full temperature rage) from 40MHz to 3.8GHz. Demonstration circuit 1120A features broadband input impedance matching optimized for evaluating the LT5538 at frequencies between 40MHz and 2.7GHz. It can be easily reconfigured for higher operating frequencies up to 3.8GHz or optimized to specific frequencies for narrow band applications.