Oscillators -377LB5I1562T Application Field and Working Principle

Oscillators are electrical circuits used to produce and control the frequency of an electrical waveform. In simple terms, they serve as the ‘heartbeat’ of most electronic systems. This article will focus on the 377LB5I1562T oscillator and discuss its application field and working principle.

377LB5I1562T Application Field

The 377LB5I1562T oscillator is a type of frequency-stable voltage-controlled oscillator (VCO) and it is widely used in radio frequency (RF) applications. The VCO technology used in the 377LB5I1562T enables the oscillator to provide stable frequencies in the range of 83.375 MHz - 86.5 MHz when operating from a 5.0 V supply. This makes the 377LB5I1562T suitable for RF local area networks (LANS), spread-spectrum communication systems, and wireless point-to-point communication systems.

377LB5I1562T Working Principle

The 377LB5I1562T oscillator works by taking an input voltage, known as the control voltage (Vctrl), and using it to control the frequency of an oscillation. This is achieved by varying the gain of an amplifier, known as an active element. The active element consists of an amplifier, an amplifier bias network, and a frequency-determining device. The frequency-determining device acts as a variable resistor, allowing the adjustment of the input capacitance in the amplifier, and thus the frequency of oscillation. The device is adjusted by applying the Vctrl voltage, with higher voltages resulting in higher frequencies.

The 377LB5I1562T also features variable frequency compensation, which is used to maintain stability over a wide temperature range, typically -40°C to +125°C. It also includes over-range-protection circuitry, which ensures that the circuit is protected from overloads or large Vctrl voltages.

Conclusion

The 377LB5I1562T oscillator has many uses in RF applications, due to its excellent frequency stability. Its working principle is based on using a variable input capacitance to adjust the frequency of an electrical waveform in response to a control voltage. In addition, it features variable frequency compensation and over-range-protection circuitry to ensure its stable operation over a wide temperature range and to protect it from overloads.