Abstract: An attenuator for IF and RF electrical signals is disclosed comprising a digital mapping means which transforms a digital control word representing the amount of attenuation desired to a current gain control word and a voltage gain control word. The current gain control word causes a current gain means to impart a specific current through a control diode. A first voltage follower is used to measure the voltage imparted across the control diode. The voltage gain control word causes a voltage gain means to output a specific voltage to a summer which combines the specific voltage with the output voltage of the first voltage follower. The summed voltages are taken by a second voltage follower to the cathode of an attenuating diode, whose anode is connected to the signal to be attenuated.

Abstract: In a transponder having first and second antennas an inverse gain modulator is provided. The inverse gain modulator comprises a power-responsive balance circuit coupled to the two antennas. The power level of the output signal returned by the second antenna is inversely related to the power level of the signal received by the first antenna.

Abstract: A split gate radar pulse tracking circuit employs sequential and contiguously generated early and late gate sampling pulses for sampling a radar video signal containing a target pulse to be tracked in range. The video signal is fed into a first (X) input port of an integrated circuit multiplier and the early and late gate pulses are fed into the positive and negative terminals of the second (Y) multiplier input port. The gain networks of the multiplier are set so that when the early and late gate pulses are not present, the gain of the Y channel is 0 and the multiplier output is also 0. When a sampling pulse is present, the gain of the Y channel is 1 and the multiplier output is a replica of the video input. Because the early and late gate pulses are fed to positive and negative multiplier inputs, presentation of the late gate pulse reverses the polarity at the multiplier output.