The **CRO2120B-LF** is a high-performance **Voltage Controlled Oscillator (VCO)** manufactured by Skyworks Solutions (formerly Z-Communications). It is primarily designed for high-frequency signal generation in telecommunications and radio-frequency (RF) systems. --- ### 1. Key Technical Specifications Below are the core electronic parameters for the CRO2120B-LF: | Parameter | Specification | Unit | | :--- | :--- | :--- | | **Frequency Range** | 2120 to 2120 | MHz (Fixed/Narrow) | | **Tuning Voltage** | 0.5 to 4.5 | Vdc | | **Output Power** | 3.0 ± 3.0 | dBm | | **Phase Noise (@10kHz offset)** | -110 (typ) | dBc/Hz | | **Supply Voltage (Vcc)** | 5.0 | Vdc | | **Supply Current (Icc)** | 25 | mA | | **Harmonic Suppression** | -15 | dBc | | **Package Style** | MINI-16-LOW | Surface Mount | --- ### 2. Functional Components The internal architecture of this VCO consists of several critical electronic stages: 1. **Resonator Circuit:** Uses a high-Q ceramic coaxial resonator. This is what gives the "CRO" (Ceramic Resonator Oscillator) its name, providing superior phase noise performance compared to standard LC oscillators. 2. **Varactor Diode:** Acts as a voltage-variable capacitor. By changing the **Tuning Voltage**, the capacitance shifts, which adjusts the oscillation frequency. 3. **Active Transistor Stage:** Provides the necessary gain to sustain oscillation and ensures a stable output power level. 4. **Buffer Amplifier:** Internally isolates the oscillator from the output load. This prevents "load pulling," where changes in the output impedance could shift the frequency. --- ### 3. Pin Configuration (Typical MINI-16) | Pin Number | Function | Description | | :--- | :--- | :--- | | **2** | Vt | Control/Tuning Voltage input | | **10** | RF Out | High-frequency signal output | | **14** | Vcc | Supply Voltage (5V) | | **Others** | GND | Ground connections for shielding | --- ### 4. Application Areas Because of its low phase noise and narrow-band stability, the CRO2120B-LF is commonly used in: * **Fixed Wireless Access:** For stable local oscillator (LO) signals. * **Satellite Communications:** Down-converters and up-converters. * **Test Equipment:** Precision signal generators.