1805–1890 MHz High Performance VCO/Synthesizer With Integrated Switch

Skyworks SKY73121-11 Voltage-Controlled Oscillator (VCO)/Synthesizer is a fully integrated, high performance signal source for high dynamic range transceivers. The device provides ultra-fine frequency resolution, fast switching speed, and low phase noise performance for 2G, 2.5G and 3G base station transceivers.

The SKY73121-11 VCO/Synthesizer is a key building block for highperformance radio system designs that require low power and a fine step size. Reference clock generators with an output frequency up to 52 MHz can be used with the SKY73121-11. The input clock frequency is divided down by programmable dividers (1 to 8) for the synthesizer. The phase detector can operate at a maximum speed of 26 MHz, which allows better phase noise due to the lower division value.

The SKY73121-11 VCO/Synthesizer is provided in a compact, 38-pin Multi-Chip Module (MCM). The device package and pinout are shown in Figure 1. A functional block diagram is shown in Figure 2. Signal pin assignments and functional pin descriptions are provided in Table 1.


  • Wideband frequency operation: 1805 to 1890 MHz
  • Process-tolerant compensation for VCO
  • 24-bit ΣΔ fractional-N synthesizer
  • Ultra-fine frequency resolution of 0.001 ppm
  • Flexible reference frequency selection
  • Three-wire serial interface up to 20 MHz clock frequency
  • Integrated PLL supply regulation for spur isolation
  • MCM (38-pin, 9 x 12 mm) Pb-free free (MSL3, 260 °C per JEDEC J-STD-020) SMT package
Data Sheets SKY73121-11: 1805–1890 MHz High Performance VCO/Synthesizer With Integrated Switch 200888B.pdf (259 KB)
ProductName : SKY73121-11
RF Output Frequency Range (MHz) : 1805-1890
Output Power (dBm) : -10
Phase Noise @ 100 kHz (dBc/Hz) :
Phase Noise @ 200 kHz (dBc/Hz) : -126
Phase Noise @ 800 kHz (dBc/Hz) : -142
Phase Noise @ 1 MHz (dBc/Hz) :
Phase Settling Time (µS) : 227
Current Consumption (mA) : 114
Supply Voltage (V) : 5
Package (mm) : 38-pin MCM, 9 x 12 x 1.7
Product Information:
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