353TB3A426R

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Oscillators are important components in a variety of communication systems, often used to generate higher frequencies than what can be achieved with digital circuits. The 353TB3A426R is a simple oscillator based on the conventional Pierce oscillator topology, a type of LC (inductor-capacitor) oscillator. It is designed to operate between 14.0 and 16.0 MHz, and provides excellent frequency stability. This article will discuss its application field and working principle.

Application Field

The 353TB3A426R oscillator is mainly used in small but sensitive frequency applications, such as radio and telephone frequencies. It is especially popular for HF (high frequency) and VHF (very high frequency) operations, as it provides excellent frequency stability, even when exposed to external environmental noise and vibration. Additionally, it is also suitable for intereference-sensitive portable applications such as portables, land-mobile radios, and mobile phones.

Working Principle

The 353TB3A426R Pierce oscillator is based on the conventional Pierce oscillator topology. It consists of an LC tank that operates as an LC resonant circuit, and a transconductance amplifier. The LC tank consists of an inductor and a capacitor, tuned to the desired frequency. The transconductance amplifier acts as an amplifier-mixer-limiter and is responsible for providing feedback to sustain oscillation.

The amplifier in the oscillator provides positive feedback when its input impedance is matched with the impedance of the LC tank. At each cycle, some energy from the amplifier is fed back to the LC tank and this will increase the tank voltage and, consequently, alter the LC oscillation frequency. This design ensures continuous oscillation until the oscillator reaches the desired frequency. It also enables the oscillator to provide excellent frequency stability against environmental noise and vibration, as well as temperature variations.

In summary, the 353TB3A426R Pierce oscillator is designed for a range of frequency applications, and is especially suitable for HF and VHF operations. It is based on the conventional Pierce oscillator topology and consists of an LC tank and a transconductance amplifier. The amplifier acts as an amplifier-mixer-limiter and provides positive feedback to the LC tank in order to maintain oscillation. This design also ensures that the oscillator has excellent frequency stability.

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