Gated Wide-Range Vco
The CD4046 is a versatile phase-locked loop (PLL) integrated circuit that can be utilized for various frequency synthesis and modulation applications. In this configuration, the gating of the CD4046 can be accomplished through either a mechanical switch or an electronic control signal, allowing for flexible operation depending on the application requirements.
The circuit typically includes a voltage-controlled oscillator (VCO) that generates a frequency output based on the input control voltage. The frequency range of this specific circuit configuration is designed to operate effectively up to 1.5 kHz. For applications requiring higher frequency outputs, it is advised to replace the capacitor labeled C1 with one that has a lower capacitance value, which will enable the VCO to oscillate at higher frequencies.
The schematic may include additional components such as resistors and diodes to ensure stable operation and to filter noise, which is critical in maintaining the integrity of the frequency output. Proper selection of these components, along with the capacitor, will dictate the performance characteristics of the PLL circuit, including its frequency stability, response time, and overall efficiency.
When designing such circuits, it is essential to consider the power supply requirements, as the CD4046 operates within specific voltage ranges to function optimally. Additionally, the layout of the circuit should minimize parasitic capacitances and inductances to avoid unwanted oscillations and to enhance the reliability of the frequency output. A CD4046 can be gated either with a switch or electronically, as shown in the figure. Frequency range of this circuit is to 1.5 kHz; use another C1 for higher frequencies,
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