SAGE Millimeter’s standard amplifiers and active multipliers all have built-in regulators to protect the delicate microwave semiconductor devices. In addition, all amplifier and active multipliers have a built-in “charge pump” to generate negative bias so that only a single positive power supply is required. With this feature, the user does not need to worry about having second power supply for gate bias and also has no chance of damaging the amplifiers and active multipliers by accidentally letting the gate float while applying the positive power supply.
Because of the built-in regulator, the bias voltage required for the amplifiers and active multipliers is not critical. For most models, the typical bias voltage is often specified at +8 Vdc between the range of +6 Vdc minimum and +15 Vdc maximum. This is mainly due to the fact that the majority of SAGE Millimeter amplifiers and multipliers are built with GaAs devices, which only need up to +8 Vdc bias. However, the industry standard power supplies or system available power supplies are often available at +12 Vdc or +15 Vdc. SAGE Millimeter does encourage the user to use as low DC bias as possible simply because the higher bias will cause more heat generation. This could lead to either requiring a bigger heatsink or reducing the products’ performance and possible MTBF (mean-time-before-failure).
SAGE Millimeter also designs and manufactures GaN device based amplifiers and multipliers from time to time. For those products, a higher DC bias is required. The bias voltage range is often from +13 Vdc to +30 Vdc.