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Oscillators

Oscillators are electronic circuits that generate regular, repetitive signals, such as sine, square, triangular, and sawtooth waves. Electronic oscillators use either a combination of active and passive components such as transistors and resistors, or specialized integrated circuits to generate electrical signal of a specific frequency. Oscillators are used in a variety of applications, including analog synthesis devices, testing and measuring equipment, electronic communication systems, timers, clocks, remote control systems, and musical instruments.

SIT8209AC-31-25S-125.000000Y

The SIT8209AC-31-25S-125.000000Y is a high frequency voltage controlled oscillator (VCO) from Silicon Laboratories designed for use in wireless communication systems. This VCO operates at a center frequency of 125MHz and features low phase noise (-107 dBc/Hz typical) and excellent temperature stability (less than +/-18 ppm/degree C). The output power is adjustable between 0 dBm and +10 dBm by using the control voltage, and the input voltage can be tuned between 0.4V and 2.0V to adjust the output frequency.

Application Field:

The SIT8209AC-31-25S-125.000000Y is a highly stable and low noise oscillator, making it an ideal choice for use in RF and microwave applications such as satellite communication systems, mobile phone base stations, and 802.11 wireless local area networks (WLANs). In addition, its low output power renders it useful in many RF measurement systems such as signal analyzers, spectrum analyzers, and RF signal generators.

Working Principle:

The SIT8209AC-31-25S-125.000000Y is a voltage-controlled oscillator (VCO) consisting of an oscillator circuit whose center frequency is determined by an external voltage. At the heart of the VCO is an oscillator stage using an inductor-capacitor (LC) tank circuit loaded with varactor diodes. The oscillator circuit is driven by a tailored pulse signal generated from a power amplifier and sawtooth wave generator. The frequency of the oscillator is inversely proportional to the inductance and voltage of the varactor diode. Thus, by varying the control voltage applied to the varactor diodes, the frequency of the output signal can be adjusted.

The output power is set by the amplitude of the pulse generated by the power amplifier, which is connected to the LC tank through a coupling network. This coupling network is composed of an inductor and capacitor, and is used to transfer the power in the pulse signal to the oscillator. The amplitude of the pulse is adjusted by connecting the power amplifier to a DC supply voltage in the range of 0 dBm to +10 dBm.

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