Dual T oscillator
Source: InternetPublisher:fish001 Keywords: Oscillator frequency response RC filter low pass Updated: 2020/01/10
A dual-T oscillator is shown because two T-shaped RC filters are used in the feedback loop . The combination of one dual-T oscillator
with a low-pass frequency response and the other with a high-pass frequency response creates a band-stop or notch frequency response with a center frequency
equal to all desired oscillation frequencies. When the frequency is higher or lower than fr, oscillation does not occur because of the negative feedback through the filter
. However, when the frequency is equal to up, the negative feedback at this time is very small, so it can be ignored. Therefore, the positive feedback signal of the voltage divider formed by Ri and R2
causes the circuit to oscillate.
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