4HF187510Z3AACTGI8

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Oscillators

An oscillator is an electrical or mechanical device that creates a continuous signal for a specific application. The 4HF187510Z3AACTGI8 oscillator is a voltage-controlled oscillator (VCO) designed for high frequency, low phase noise applications such as high speed data links, wireless local area networks (WLANs), radar, and avionic communication systems. It is a versatile device, offering absolute stability of frequency with temperature and supply variations.

Application Field

The 4HF187510Z3AACTGI8 oscillator operates from 1.5 to 2.5V and offers frequency range of 100MHz to 1875MHz. It is designed to be used in a variety of applications such as:

• Wideband and narrowband applications
• Commercial and military radios
• Wireless Local Area Networks
• Radio equipment
• RF test and measurement
• Avionics systems
• Radar systems

Working Principle

The 4HF187510Z3AACTGI8 voltage-controlled oscillator operates on the principle of an RF amplifier that is controlled by a special voltage-controlled control voltage. In effect, this circuit provides an adjustable frequency output, depending on the applied control voltage. It is an analog voltage-controlled oscillator (VCO) that allows frequency tuning directly from the supply voltage. The frequency range can be tailored to the application, dependent on the control voltage swing and output capacitor.

The VCO core is a balanced Gilbert self-oscillating circuit operating at about 1 GHz. It has a wide tuning range with a control voltage range of 1.5 to 2.5V. The core consists of two identical amplifying elements, a pair of transistors, which are connected in opposite phase and operated at a certain balance to generate the oscillations. This oscillator is designed to work with an operating current of 10mA and a supply voltage of 1.5 to 2.5V.

The oscillator operates in a push-pull configuration with the transistors connected together in opposite phase. When the frequency is tuned by applying an external bias voltage, the two transistors switch phases, which controls the gain of the oscillator.

The circuit utilizes an active inductor, a type of LC circuit, to maintain stability over temperature and other environmental parameters. The active inductor is designed with a fixed inductance and a multiplicative gain in excess of unity. This gain helps to increase the effective inductance of the circuit and provides improved frequency stability.

The circuit also utilizes an onboard programmable phase shift circuit. This circuit consists of two independently adjustable digital control lines that allow the user to adjust the amount of phase shift for the signal, which can enhance the spectral purity of the signal.

The output signal is amplified and filtered to surpass any spurs that might be generated by the oscillator circuit. Finally, the output is passed through a low pass filter and output from the chip. The signal is then ready to be used in the application.

The 4HF187510Z3AACTGI8 voltage-controlled oscillator is designed for the highest performance in frequency, phase noise and linearity. It offers a wide tuning range, low power dissipation and provides the best stability over temperature for applications such as high speed data links, wireless local area networks, radio and avionic communication systems.

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