A good PCB layout and grounding scheme are crucial for optimal performance. Mini-Circuits recommends a 4-layer PCB with a solid ground plane, and to keep the input and output traces as short as possible. Additionally, it's recommended to use a common ground point for the amplifier's ground pins and to avoid running digital signals near the amplifier's analog signals.
The PGA-1021+ has a variable gain control pin (VGC) that allows the user to set the gain from 0 dB to 20 dB. To choose the correct gain setting, consider the input signal level, the desired output signal level, and the noise floor of the system. A higher gain setting may be required for low-level input signals, but may also increase the noise floor.
The PGA-1021+ can handle input signal levels up to +2 dBm without significant distortion. However, the maximum input signal level may vary depending on the gain setting and the frequency of the input signal. It's recommended to consult the datasheet and application notes for more information.
To ensure stability and prevent oscillations, it's recommended to follow proper PCB layout and grounding practices, and to use a decoupling capacitor (e.g. 100 nF) between the power supply pin and ground. Additionally, the input and output impedance of the amplifier should be matched to the source and load impedance, respectively.
The typical current consumption of the PGA-1021+ is around 55 mA, but this can vary depending on the gain setting, input signal level, and operating frequency. It's recommended to consult the datasheet for more information on power consumption and to ensure that the power supply can provide the required current.
PGA-1021+ datasheet
by Mini-Circuits
