FN3600021

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Oscillators are electronic circuit components with frequency-determining media, which are driven by electricity and naturally generate repeating signal waveforms infinitely. The FN3600021 is a voltage-controlled oscillator (VCO) that is widely used in the radio frequency (RF) industry. The construction and principle of the application field and working principle are remarkable.

Application field of the FN3600021 oscillator

The FN3600021 is a voltage-controlled oscillator (VCO) with an output frequency range of 10 MHz to 350 MHz, designed for use in the radio frequency (RF) industry. It has a small package size of 1.4mm x 0.8mm, and an operating temperature range of 0 °C to + 70 °C (-40 °F to + 158 °F). The FN3600021 is used in Commercial Communications Systems, General Signal Generation, Multimode Wireless Systems, and Paging Systems, etc. It provides the radio frequency engineer with the necessary frequency range performance and tight control.

FN3600021 working principle

The FN3600021 is based on the fundamental Colpitts Oscillator circuit architecture, which uses a pair of capacitors and an inductor to form a tuned LC parallel/serial circuit to provide the frequency-determining element, together with the gain of the active amplifier (usually a bipolar transistor) to form an oscillator. The circuit is designed to oscillate at a desired frequency in response to a DC control voltage applied to the input terminals, thus forming a voltage controlled oscillator. The frequency of oscillation increases in response to an increase in the control voltage.

The FN3600021 has a buffer input stage which uses an NPN transistor to provide basic amplification and drive to the oscillator circuit. The oscillator is formed around an NPN bipolar transistor drive by two capacitors and a tuned LC resonant circuit. The control voltage is applied to the base of the transistor and, as the voltage changes, the frequency of the oscillator also changes, thereby controlling the frequency of the output signal. The output signal of the FN3600021 oscillator is buffered and isolated from the rest of the circuit with an emitter follower output stage.

The FN3600021 oscillator has excellent linearity, low phase noise (typically <-130 dBc/Hz @100Hz offset), low pull-in range (<2kHz), and low current draw (<9 mA). This makes it an ideal choice for high performance frequency control circuits in the RF industry. The Fn3600021 is well suited for many applications, ranging from cell phone repeaters to wireless audio to digital TV broadcast antennas.

The FN3600021 is a reliable voltage-controlled oscillator that provides excellent linearity, low phase noise, low pull-in range, and low current draw. It is used in a variety of radio frequency applications, making it a versatile and cost-effective choice for the radio frequency engineer.

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