Part Details for HMC635LC4 by MDD (Microdiode Electronics)
Overview of HMC635LC4 by MDD (Microdiode Electronics)
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Part Details for HMC635LC4
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Reference Designs related to HMC635LC4
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CN0390 - 20 GHz to 37.5 GHz, RF Automatic Gain Control (AGC) Circuit
The automatic gain control (AGC) circuit is useful in multiple applications such as amplitude stabilization of a synthesizer, controlling output power in a transmitter, or optimizing dynamic range in a receiver. This circuit uses the ADL6010 detector, along with the HMC985A voltage variable attenuator (VVA) and the HMC635 RF amplifier, to provide automatic gain control over a wide range of input frequencies (20 GHz to 37.5 GHz) and amplitude. Circuit performance, as measured by the AGC figures of merit described in this circuit note, are very good between 20 GHz and 30 GHz. The overall gain of the circuit falls off above 30 GHz. However, improvements can be made over narrow bands by using matching techniques not explored in this circuit note.<p>The AGC circuit has applications in microwave instrumentation and radar-based measurement systems.