DATA SHEET SMS7621-060: Surface-Mount, 0201 Low-Barrier Silicon Schottky Diode Applications Sensitive detector circuits Sampling circuits Mixer circuits Features Low barrier height Suitable for use above 26 GHz Low parasitic impedance: CP < 0.05 pF, LS < 0.2 nH Description Low profile, ultra-miniature 0201 SMT package The SMS7621-060 is a silicon, low-barrier N-type Schottky diode (MSL1, 260 C per JEDEC J-STD-020) with an ultra-miniature 0201 footprint. This diode can be used in detector circuits, sampling circuits, and mixer circuits. TM The low series resistance of this low-barrier diode enables good Skyworks Green products are compliant with performance as a low-level mixer at frequencies up to 26 GHz all applicable legislation and are halogen-free. and higher. For additional information, refer to Skyworks TM Denition of Green , document number A pinout diagram for the SMS7621-060 is shown in Figure 1. SQ040074. Bottom View Top View Y1951 Figure 1. SMS7621-060 Pinout Diagram Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 201294G Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice July 26, 2019 1 /4 /4 DATA SHEET SMS7621-060: 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 SMS7621-060 Schottky A rat-race mixer that uses two SMS7621-060 Schottky diodes is diode and covers the 24 GHz band is shown in Figure 2. The RF shown in Figure 4. The LO signal (24 GHz) is fed from the right arrives on a 50 microstrip line from the left and is shorted to 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. Both diodes are connected (using a 1206 resistor) and are loaded This output is loaded by a 100 k resistor and a 100 pF by a 470 resistor and a 10 pF capacitor. This forms the IF capacitor. The output voltage is fed to a 2-pin, 2.54 mm header. output (10 MHz). The RF input (24.010 GHz) is directly connected to the rat-race ring. A layout design is illustrated in Figure 5. The circuit was built on a 0.254 mm Rogers RO-4350B substrate and measured with a power-variable 24 GHz source. A layout The mixer has been tested with the following conditions: design is illustrated in Figure 3. LO frequency: 24 GHz Input power versus detected voltage for this detector is shown in LO power: 0 to +5 dBm Figure 8. 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 201294G