DC2483A-A Analog Devices

DEMO MANUAL DC2483A-A/DC2483A-B LTC5562 Wideband Low Power Active Mixer Description The LTC 5562 is a versatile low power mixer optimized down for further power savings. The total mixer current for applications requiring very wide input bandwidth, low is adjustable, allowing for even further power savings. distortion, and low LO leakage. This mixer can be used The standard match frequency ranges for each board are for either upconverting or downconverting applications, outlined in the table below. and provides a nominal conversion gain of 1dB. Demon- DEMO BOARD INPUT RANGE LO RANGE OUTPUT RANGE stration circuit 2483A-A showcases the LTC5562 mixer DC2483A-A 30MHz to 3GHz 2.8GHz to 3.4GHz 3.3GHz to 3.7GHz for upconverting applications while demonstration circuit DC2483A-B 30MHz to 3GHz 0.4GHz to 1.4GHz 10MHz to 550MHz 2483A-B is tuned for downconverting applications. The differential inputs are optimized for use with 1:1 trans- Design files for this circuit board are available at mission-line baluns, allowing very wideband impedance DEMO MANUAL DC2483A-A/DC2483A-B n otes on t est e Ment s High performance signal generators with low harmonic Spectrum analyzers can produce significant internal outputs should be used for 2-tone measurements. Oth- distortion products if they are overdriven. Generally, erwise, lowpass filters at the signal generator outputs spectrum analyzers are designed to operate at their should be used to suppress harmonics. best with about 30dBm to 40dBm at their input. The spectrum analyzers input attenuation setting should be High quality combiners should be used to present a used to avoid saturating the instrument. broadband 50 termination on all ports as well as provide good port-to-port isolation. Adding attenua- Set the spectrum analyzers input attenuation depend- tor pads further improves source isolation and helps ing on the spectrum analyzer used. prevent the signal generators from producing inter- Before performing measurements on the DUT, the sys- modulation products. tem performance should be evaluated to ensure that a clean input signal is obtained and that the spectrum analyzers internal distortion is minimized. dc2483aabf 2 etup quip