Typical Applications

The design experience describes a compact variable gain amplifier designed at center frequency of 24 GHz. This MMIC is designed on Jazz SiGe120 (SBC18) Bi-CMOS process. In the current design we have two gain stage LNA with a dynamic range of 10 dB. The amplifier has a high gain (10 dB) and a low gain (0 dB) stage. The noise figure of the amplifier is 4 dB to 5 dB. This noise performance across a large dynamic range makes it a unique receiver front-end. The amplifier has a differential configuration to reduce substrate and source noise. The amplifier is terminated in input impedance of 100 ohms. The concept can be easily ported to other millimeter wave frequency of operation. The noise figure can be traded with non-linearity through negative feedback resistors.

• Differential configuration
• Variable gain capability (currently high and low gain state)
• Low noise figure: 4 dB at high gain and 5 dB at low gain
• Dual gain: 10 dB high gain and 0 dB at low gain
• Low current consumption: 10 mA
• 100 ohms differential input impedance

Block Diagram