UM9552
Features
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- - Low Frequency Attenuator HF/LF Band Operation Long Lifetime (70 µ s typ.) Very Low Distortion (IP3 @ 455 KHz = < 60 d Bm)
PIN DIODE ATTENUATOR
Description
The UM9552 is a very long minority carrier lifetime (70 µ s typical) PIN DIODE that has been developed for low HF or LF Band Attenuator Applications. They have been evaluated for attenuator linearity and distortion characteristics in a Bridge Tee Attenuator Circuit at 455 KHz (the mon intermediate frequency for AM transmitters and receivers). When the UM9552’s are used as the two variable resistors in the Bridged Tee Circuit, the Third Order Intermodulation Products are below -60 d Bc with 0 d Bm input power over an attenuation range of 4 d B to 30 d B. These thicker, longer lifetime PIN diodes exhibit a more linear forward biased resistance (RS) vs forward bias current (If) relationship, which greatly simplifies the design of the driver circuits that supply the bias currents over the specified attenuation range. This...
