Oscillator na Clapp: Tsarin Matsayi Da Rasa na Kafin Kula

Wani Yana Clapp Oscillator?

Clapp oscillator (ko kuma yana nufin Gouriet oscillator) shine LC electronic oscillator wanda ya yi amfani da adadin inductor da ukuwa na capacitor don bayyana frequency ta oscillator (za a iya duba circuit diagram da ke cikin haka). LC oscillators sun amfani da transistor (ko vacuum tube ko gain element baka) da positive feedback network.

Clapp oscillator shine variation daga Colpitts oscillator inda an fi capacitor (C3) mai karfi a tank circuit don yake series da inductor a cikin ita, kamar yadda ake nuna a cikin circuit diagram da ke cikin haka.

Babu wasu abubuwan da suka badala a kan abubuwan da suka ci gaba a cikin Colpitts oscillator.

Saboda haka, tattalin aiki ta wannan circuit shine mafi yawan kaɗi a cikin Colpitts, inda feedback ratio take dogara da yin da yawa da yin da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauwata wa yin da yawa da yauw......

Amma frequency ta yin da yawa wa Clapp oscillator an bayyana ne kamar yadda ake nuna cikin haka

Akwai lokacin da C3 ya zama mafi yawan kaɗi daga biyu na capacitor. Wannan shine saboda, a gaba-gaban frequency, idan C3 ya fi, inductor ya zama mafi yawan kaɗi, wanda ya taimaka a yi amfani da shi da kuma ya haɓe takardun stray inductance.

Amma, ya kamata a duba mai sarrafa da C3 da yawa. Saboda, idan an zaɓe ita mafi yawan kaɗi, ba zan iya yin da yawa ba saboda L-C branch ba zan iya samun net inductive reactance.

Amma, a nan ya kamata a lura cewa, idan C3 an zaɓe mafi yawan kaɗi daga C1 da C2, net capacitance take dogara da ita.

Saboda haka, equation ta frequency ya zama kamar yadda ake nuna cikin haka

Ko da yake, presence of this extra capacitance will make the Clapp oscillator preferable over Colpitts when there is a need to vary the frequency as is the case with Variable Frequency Oscillator (VCO). The reason behind this can be explained as follows.

In the case of the Colpitts oscillator, the capacitors C1 and C2 need to be varied in order to vary their frequency of operation. However during this process, even the feedback ratio of the oscillator changes which in turn affects its output waveform.

One solution to this problem is to make both C1 and C2 to be fixed in nature while achieving the variation in frequency using a separate variable capacitor.

As could be guessed, this is what the C3 does in the case of the Clapp oscillator, which in turn makes it more stable over Colpitts in terms of frequency.

The frequency stability of the circuit can be even more increased by enclosing the entire circuit in a chamber with constant temperature and by using a Zener diode to ensure constant supply voltage.

In addition, it is to be noted that the values of the capacitors C1 and C2 are prone to the effect of stray capacitances unlike that of C3.

This means that the resonant frequency of the circuit would be affected by the stray capacitances if one had a circuit with just C1 and C2, as in the case of Colpitts oscillator.

However, if there is C3 in the circuit, then the changes in the values of C1 and C2 would not vary the resonant frequency much, as the dominant term would then be C3.

Next, it is seen that the Clapp oscillators are comparatively compact as they employ a relatively small capacitor to tune the oscillator over a wide frequency band. This is because, here, even a slight change in the value of the capacitance varies the frequency of the circuit up to a great extent.

Further, they exhibit a high Q factor with a high L/C ratio and lesser circulating current in comparison with Colpitts oscillators.

Lastly, it is to be noted that these oscillators are highly reliable and are hence preferred in spite of having a limited range of frequency of operation.

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