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A phase margin of 60 degrees is also a magic number because it allows for the fastest settling time when attempting to follow a voltage step input (a Butterworth design). An amplifier with lower phase margin will ring [nb 1] for longer and an amplifier with more phase margin will take a longer time to rise to the voltage step's final level.
Figures 8 and 9 illustrate the gain margin and phase margin for a different amount of feedback β. The feedback factor is chosen smaller than in Figure 6 or 7, moving the condition | β A OL | = 1 to lower frequency. In this example, 1 / β = 77 dB, and at low frequencies A FB ≈ 77 dB as well. Figure 8 shows the gain plot.
Margin rate: 10.50 percent. Margin trading: How it works. Borrowing through a margin loan allows you to buy more of a security than you could with your available cash.
The result is a phase margin of ≈ 45°, depending on the proximity of still higher poles. [ b ] This margin is sufficient to prevent oscillation in the most commonly used feedback configurations. In addition, dominant-pole compensation allows control of overshoot and ringing in the amplifier step response , which can be a more demanding ...
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The initial margin requirement for such margin stock purchases has been 50% [2] since 1974, [3] but Regulation T gives the Federal Reserve the authority to change this percentage. Raising the margin requirement ostensibly reduces risk in the financial system by reducing the potential leverage and total buying power of investors.
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