The Barkhausen criteria for sustained oscillations in a positive feedback system, as shown in Fig. 4, are:

1. The loop gain (product of gain and feedback factor) of the system must be equal to or greater than one. This means that the system must be able to sustain the oscillations without any external input.

2. The phase shift around the loop must be an integral multiple of 2π radians. This ensures that the feedback signal reinforces the original signal, leading to sustained oscillations.

Please note that without the actual Fig. 4, I'm assuming a general positive feedback system. The specifics might vary depending on the actual system configuration in Fig. 4.

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The Barkhausen criteria for sustained oscillations in a positive feedback system, as shown in Fig. 4, are:

1. The loop gain (product of gain and feedback factor) of the system must be equal to or greater than one. This means that the system must be able to sustain the oscillations without any external input.

2. The phase shift around the loop must be an integral multiple of 2π radians. This ensures that the feedback signal reinforces the original signal, leading to sustained oscillations.

Please note that without the actual Fig. 4, I'm assuming a general positive feedback system. The specifics might vary depending on the actual system configuration in Fig. 4.

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The Barkhausen criteria for sustained oscillations in a positive feedback system, as shown in Fig. 4, are:

1. The loop gain (product of gain and feedback factor) of the system must be equal to or greater than one. This means that the system must be able to sustain the oscillations without any external input.

2. The phase shift around the loop must be an integral multiple of 2π radians. This ensures that the feedback signal reinforces the original signal, leading to sustained oscillations.

Please note that without the actual Fig. 4, I'm assuming a general positive feedback system. The specifics might vary depending on the actual system configuration in Fig. 4.

For a positive feedback system shown in fig. 4, what is the Barkhausen criteria for sustained oscillations?

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