Demonstration circuit DC991A is optimized for a down-converting mixer tests & measurements for input frequency range of 700MHz to 1680MHz, an output frequency range of 110 MHz to 170MHz (12 dB return loss BW). The LO port frequency range is 515 to 915MHz (10 dB return loss BW). The LT®5560 is a high performance broadband Up/Down-converting active mixer. This doublebalanced mixer can be driven by a single-ended LO source and requires ?2dBm of LO power. The signal ports can be impedance matched to a broad range of frequencies, which allow the LT®5560 to be used as an up- or down-conversion mixer in a wide variety of applications. The LT®5560 is characterized with a supply current of 10mA; however, the DC current is adjustable, which allows the performance to be optimized for each application by changing the value of resistor R1. For Icc=10mA the value of R1=3-ohm. Operation at a lower supply current will, however, degrade linearity.