gain margin

[′gān ‚mär·jən]

(control systems)

The reciprocal of the magnitude of the loop ratio at the phase crossover frequency, frequently expressed in decibels.

References in periodicals archive ?

The gain margin is the amount of gain increase or decrease required making the loop gain unity at the frequency where the phase angle is -180[degrees], and the phase margin is the difference between the phase of the response and -180[degrees] when the loop gain is 1.0.

HTR-10GT Dual Bypass Valve Control Features and Decoupling Strategy for Power Regulation

The phase margin and gain margin can be expressed, respectively, as

Active Hybrid Control Algorithm with Sky-Hook Damping and Lead-Lag Phase Compensation for Multi-DOFs Ultra-Low Frequency Active Vibration Isolation System

On the other hand, the loop gain method [9, 11] (which is equivalent to use the [RR.sub.T] Nyquist traces to analyze the circuit) allows to get some very useful parameters as gain margin, loaded quality factor ([Q.sub.L]), which in fact is directly related to phase noise, and the possibility to assure the necessary and sufficient condition for a proper start-up of the oscillator.

Transpose return relation method for designing low noise oscillators

Based on this value (Landau et al., 1997), some robustness measures like gain margin, modulus margin can be calculated.

Methods for nonlinear processes control: control structures based on nonlinearity compensators

The gain margin and phase margin are 6.64 and 63.92o, respectively.

Approximate pole placement with dominance for continuous delay systems by PID controllers

At the same time, rising production and transportation costs are forcing some national brand manufacturers to downsize their products, in an attempt to gain margin. As a result private labels sometimes offer much better quality, he notes.

Store-brand land: are record crowds at the most recent PLMA show a sign of a coming golden age?

Once the linear oscillation criteria are established for the open-loop cascade, the loop is closed, and the oscillation level builds until the device nonlinearity absorbs the excess gain margin at the phase-zero crossing frequency.

Recent trends in oscillator design

* Gain margin, the amount the gain has fallen below unity when the total phase lag is 360[degrees], is expressed in decibels.

Measuring closed-loop feedback response: Verify that your power supply's specified transient response is real. Here's a step-by-step procedure on how to test the closed-loop response under load. (Power Supply Test)

Most mass merchants commonly use big-title new releases as loss leaders, so they must rely on other titles--like direct-to-video--to gain margin.

Direct-to-video gets star billing

The Bode phase diagram is superimposed on the magnitude plot for easy calculation of phase margin or gain margin. Printer support of the graphics display is provided for Epson nine-pin, dot-matrix printers.

Software for control systems design

On the other hand, the linear simulation can only estimate the oscillation frequency, gain margin and oscillator [Q.sub.L] (loaded quality factor), but neither the output power nor phase noise or harmonic levels can be estimated.

Provisos for classic linear oscillator design methods. New linear oscillator design based on the NDF/[RR.sub.T]

[Gain.sub.MIN] = [P.sub.OUT_MAX] - [P.sub.IN_MAX] + gain margin

A high gain power amplifier with variable bias for multi-mode WCMDA appliations. (Cover Feature)