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LM 데이터시트(PDF) – National Semiconductor (TI)
Voltage controlled oscillator is a type of oscillator where the frequency of the output oscillations can be varied by varying the amplitude of an input voltage signal. Another application of the voltage controlled oscillator is the variable frequency signal generator itself.
The block diagram of a typical voltage controlled oscillator is shown below. Voltage controlled oscillators can be broadly classified into a linear voltage controlled oscillators and relaxation type voltage controlled oscillators. Linear voltage controlled oscillators are generally used to produce a sine wave. In such oscillators, an LC tank circuit is used for producing oscillations. An active element like a transistor is used for amplifying the output of the LC tank circuit, compensating the energy lost in the tank circuit and for establishing the necessary feedback conditions.
Here a varactor varicap diode is used in place of the capacitor in the tank circuit. A varactor diode is a type of semiconductor diode whose capacitance across the junction can be varied by varying the voltage across the junction.
Thus by varying the voltage across the varicap diode in the tank circuit, the output frequency of the VCO can be varied.
Relaxation-type voltage controlled oscillators are used to datasheeg a sawtooth or triangular waveform. It can be used to generates square and triangle waveforms simultaneously. The frequency of the output waveform can be adjusted using an external control voltage.
The output frequency can be also programmed using a set of external resistor and capacitor. The LM IC can be operated from a single supply or dual supply. While using a single supply, the supply voltage range is from 10V to 24V. The IC has a very linear modulation characteristic and has excellent thermal stability.
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The circuit diagram of a voltage controlled oscillator using LM is shown in the figure below. Resistor R1 and capacitor C1 form the timing components. Capacitor C2 is used to prevent the parasitic oscillations during VCO switching. Resistor R3 is used to provide the control voltage Vc.
National Semiconductor LM Series Datasheets. LMCN, LM, LMC Datasheet.
Triangle and square wave outputs are obtained from pins 4 and 3 respectively. The output frequency of the VCO can be obtained using the following equation:.
I need a circuit that does just the function 2 Wave of UTC http: Can you recommend a circuit or teach me how to do this? Thank u very much. Your email address will not be published. Voltage Controlled Oscillator jojo July 29, 4 Comments. VCO Voltage controlled oscillator Voltage controlled oscillator is a type of oscillator lm56 the frequency of the output oscillations can be varied by varying the lk566 of an input voltage signal. Circuit Diagram Components Resistor — 4.
The output frequency of the VCO can be obtained using the following equation: Signal Generatorsvcovoltgae controlled oscillator.
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