M862A Herley Ultra-Broadband SPST Switch

The CAES / Herley / General Microwave 86 Series Ultra-Broadband SPST Switches operate at up to 18 GHz. Each model features an integrated circuit assembly of up to four PIN diodes mounted in a microstrip transmission line as well as a resistive bias line that contributes to the broadband low-loss performance. By applying positive current to the bias terminal, the diodes are biased to low resistances and the switch is OFF. With zero or negative voltage at the bias terminal, the diodes are biased to high resistances and the switch is ON.

Models M862B and M864B operate over the frequency range from 0.1 to 18 GHz. They exhibit nominal isolation characteristics of 45 and 80 dB at 18 GHz, respectively, with maximum rise and fall times of 50 nanoseconds.

For higher speed requirements, Models M862BH and M864BH operate from 0.5 to 18 GHz and feature maximum rise and fall times of 10 nanoseconds. Models M862BH-25 and M864BH-25 operate from 0.1 to 18 GHz with maximum rise and fall times of 20 nanoseconds.

The DM86 and FM86 switches are the same as the corresponding M86 models except the units are equipped with integrated drivers. DM86 switches are powered by +/-15 volt supplies; FM86 units are powered by +5 and -12 to -15 volt supplies. The proper current required to switch the unit ON or OFF is provided by the driver, which is controlled by an external logic signal.