Method and apparatus for achieving linearized response of PIN diode attenuators

摘要

The present invention is directed to a method and apparatus for linearizing the response of a PIN diode attenuator. A plurality of Zener diodes form a diode array. Each Zener diode has the same Zener voltage value. The cathode of a first Zener diode is coupled to an input of the diode array. The cathode of a second Zener diode is coupled to the anode of the first Zener diode. The cathode of each subsequent Zener diode is coupled to the anode of the preceding Zener diode. The anode of each Zener diode is coupled to a respective impedance. The respective impedances are further coupled in common to an output of the diode array. An amplifier provides gain and offset. The diode array output is coupled to the amplifier input. A driver provides output drive. The amplifier output is coupled to the driver input. The driver output is used for linearizing the response of a PIN diode attenuator.