ABOUT HMC629ALP4E

Question

1、 What is the difference between a bit error and a step error, as shown in the figure below 
 2、 For the chip HMC629ALP4E, will the attenuation accuracy change when the input power changes? How much does the accuracy change if it decays? 
 I hope to hear from you soon. Thank you very much.

yus · Accepted Answer

Step error : The step error is the error in stepping between consecutive states. 
 
 For a 0.5dB LSB attenuator in an ideal world (with 0dB step error), the delta between any two successive states would be 0.5dB.

State Error : The state error is the error between the desired state vs measured state. 
 
 For a 0.5dB LSB attenuator in an ideal world: with 0dB state error, the 5dB state will measure (5dB + insertion loss) or the 30dB state will measure (30dB + insertion loss). 
 
 Attenuation accuracy is independent of input power. HMC629A can handle input power 30 dBm where VDD= 5V)

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ABOUT HMC629ALP4E