Variable PIN Attenuator

This is a very useful RF attenuator circuit which works from 300KHz to the 3GHz range based on the quad PIN diode array HSMP-3816 from Avego. The lower PIN diodes are biased at 1mA which gives about a 40 to 70 ohm impedance. R5 can be increased to increase the RF input and output impedances of the circuit. The upper diodes are biased by the contro

l voltage which varies between 0 and 10V. The signal is essentially blocked when the control voltage is 0V and passes when the control voltage is high. The beauty of this circuit is that a small current can control a higher power RF waveform. Do you need help with an electronics design Daycounter provides contract electronics design services. Contact us to give you a quote on your electronics design project.

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