DATA SHEET SMSA7621-060: Surface-Mount, 0201 Low-Barrier Silicon Schottky Diode Automotive Applications 24 GHz and 77 GHz collision avoidance 2.4 GHz and 5.8 GHz Wi-Fi detector Infotainment Navigation Garage door openers Wireless control systems Telematics Description Features The SMSA7621-060 is a silicon, low-barrier N-type Schottky AEC-Q101 qualified diode with an ultra-miniature 0201 footprint. This diode may be Low barrier height used in detector circuits, sampling circuits, and mixer circuits. Suitable for DC thru 24 GHz and 77 GHz The low series resistance of this low-barrier diode enables good performance as a low-level mixer at frequencies of 24 GHz and Low parasitic impedance: CP < 0.05 pF, LS < 0.2 nH 77 GHz. Low profile, ultra-miniature 0201 SMT package A pinout diagram for the SMSA7621-060 is shown in Figure 1. (MSL1, 260 C per JEDEC J-STD-020) TM Skyworks Green products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks TM Denition of Green , document number SQ040074. Bottom View Top View Y1951 Figure 1. SMSA7621-060 Pinout Diagram Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 203198D Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice July 26, 2019 1 /4 /4 DATA SHEET SMSA7621-060: SURFACE-MOUNT, 0201 LOW-BARRIER SILICON SCHOTTKY DIODE Mixer and Detector Applications 24 GHz Detector Design 24 GHz Rat-Race Mixer A detector circuit that incorporates an SMSA7621-060 Schottky A rat-race mixer that uses two SMSA7621-060 Schottky diodes diode and covers the 24 GHz band is shown in Figure 2. The RF is shown in Figure 4. The LO signal (24 GHz) is fed from the arrives on a 50 microstrip line from the left and is shorted to right side and reaches a rat-race ring. The diodes are positioned GND by a 90-degree line with a stub (GND arrives by a via). 90 degrees apart from the LO input and are terminated in a stub. The cathode of the diode is directly connected to a 24 GHz stub. This output is loaded by a 100 k resistor and a 100 pF Both diodes are connected (using a 1206 resistor) and are capacitor. The output voltage is fed to a 2-pin, 2.54 mm header. loaded by a 470 resistor and a 10 pF capacitor. This forms the IF output (10 MHz). The RF input (24.010 GHz) is directly The circuit was built on a 0.254 mm Rogers RO-4350B connected to the rat-race ring. A layout design is illustrated in substrate and measured with a power-variable 24 GHz source. Figure 5. A layout design is illustrated in Figure 3. The mixer has been tested with the following conditions: Input power versus detected voltage for this detector is shown in Figure 8. LO frequency: 24 GHz LO power: 0 to +5 dBm RF frequency: 24.010 GHz RF power: -30 dBm The IF output was loaded with 50 . Measured conversion loss data for this mixer is shown in Figure 9. RF Input /4 /4 SMS7621-060 /4 LO Input 3/4 /4 SMS7621-060 IF Out 100 k 100 pF Figure 2. Schematic of a 24 GHz Detector Design Figure 4. Schematic of a 24 GHz Rat-Race Mixer Figure 5. Layout for a 24 GHz Rat-Race Mixer Figure 3. Layout for a 24 GHz Detector Design Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 July 26, 2019 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice 203198D