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Definition of "twin-T bridge oscillator" |
an oscillator where the twin-T bridge is used as a feedback circuit of an amplifier. The twin-T bridge has a very steep phase-frequency response in the vicinity of the bridge rejection frequency, and, with proper design, this may provide high indirect frequency stability. The most problem-free design requires that the bridge transfer function has complex-conjugate zeros slightly shifted fromj!-axis into the right half of s-plane. The amplifier should have a negative gain compensating the bridge losses at the oscillation frequency, which is close to the bridge rejection frequency. |
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