| 摘要 |
A monopulse antenna system having a four quadrant array of antenna elements and a plurality of summing and differencing amplifiers coupled to the antenna elements for combining signals received by such antenna elements to provide such monopulse antenna with a sum antenna pattern, an azimuthal difference antenna pattern, and an elevation difference antenna pattern. The differencing amplifiers include a feedback network for increasing the common mode rejection ratio of the amplifier. The amplifiers includes a pair of transistors coupled to a voltage source through active loads and a common biasing network. The pair of transistors have electrodes connected to a common junction. A variable current source biasing network comprises a resistor voltage divider for producing an output voltage equal to a portion of a bias voltage produced at the common junction and a third transistor having a pair of electrodes coupled between the common junction and the voltage source. The output voltage produced by the voltage divider is fed to a control electrode of the third transistor to maintain the bias voltage at the common junction substantially constant with processing variations used to in the formation of the transistors.
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