The DC478B demo circuit board is intended to demonstrate the capabilities of the LT5512 downconverting mixer IC for 1900MHz wireless infrastruture applications. The LT®5512 (Figure 1) is a broadband high signal level mixer IC optimized for high linearity downconverter applications including wireless and cable infrastruture. The IC includes a differential LO buffer driving a double-balanced mixer. An integrated RF amplifier improves LO-RF isolation and eliminates the need for precision external bias resistors.