Question
How is power supplied to the most common type of MMIC?
Answer Options
- A) Through a capacitor and RF choke connected to the amplifier input lead
- B) MMICs require no operating bias
- C) Through a resistor and/or RF choke connected to the amplifier output lead
- D) Directly to the bias voltage (Vcc) lead
Correct Answer: C
Explanation
MMICs (Monolithic Microwave Integrated Circuits) are designed for maximum simplicity. Unlike discrete transistors which require complex external biasing networks, the necessary bias circuitry is integrated onto the MMIC chip itself. However, the DC bias voltage still needs to be supplied to the chip without allowing the RF signal to escape or the DC to short out.
Power is supplied to the most common type of MMIC through a resistor and/or RF choke connected to the amplifier output lead. The resistor/choke acts as a decoupling network, isolating the DC bias voltage from the RF output signal, ensuring that DC power flows into the chip while the RF signal flows out cleanly to the next stage or antenna.
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