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Oscillators

653L156G3C3T application field and working principle

Oscillators are circuits that generate periodic electric signals by using frequency-determining components capable of providing applied stable and repeatable repeated frequency signals. In terms of its application field, oscillators can be divided into two major categories, which are frequency synthesis oscillators and frequency control oscillators. The 653L156G3C3T oscillators belong to the former group.

The 653L156G3C3T oscillators are mainly used in low frequency (under 30 MHz) signal sources, including radio receivers, radar and navigational satellites, and automotive systems. Specifically, they can be used to generate signals with the narrow frequency precision up to accuracy of 0.01 Hz, which are essentially necessary for applications such as positioning system measurements, and motion controllability.

In terms of working principles, the 653L156G3C3T oscillators are the Negative-Nyquist type voltage controlled oscillators (VCOs). They make use of the frequency-selective device\'s capacitance to generate signals within the range of target frequency and phase. This is how the controlled output frequency is determined, and the signal generated is usually sinusoidal. The control voltage will then vary the capacitance so as to adjust the signal\'s frequency in a given range. Hence, the feedback control voltage is required to change such capacitance in the 653L156G3C3T oscillators.

The feedback control voltage can be obtained in several ways, either with an external input, or an internal one. When an external signal is used, the oscillator is known as an open-loop type, and when the feedback voltage is taken from the device\'s own output, it is called a closed-loop type. For the 653L156G3C3T oscillators, they are the latter, in which the output signal is compared from its own reference source and then fed back to adjust its own frequency.

The 653L156G3C3T oscillators are also capable of changing their frequency by taking input from an Electrical-2-Multi-processor (E2M) based system. This technique is particularly useful in applications including, rapid phase-lock loop (RPL), real-time clock (RTC), voltage-controlled oscillator (VCXO), and bridgeable delayed tuning (BDT). In all these cases, the E2M system removes the need of manual tuning and also allows for precise change in frequency.

Overall, the 653L156G3C3T oscillators are frequency controlling circuits which generate precise periodic signals with a frequency accuracy up to 0.01 Hz and a maximum frequency range up to 30 MHz. The E2M-based loop enables for faster and easier frequency tuning. The 653L156G3C3T oscillators are widely utilized in a vast range of applications and equipment from satellite transceiver, automotive systems, to navigation and tracking systems.

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