Search results
Results from the WOW.Com Content Network
Each slope has a magnitude of 20 dB/decade, corresponding to a phase shift of 90°. When the amplifier's 180° of phase inversion is added to this, the result is a full 360° at the f i intercept, indicated by the dashed vertical line. At that intercept, 1/β = A OL for a loop gain of A OL β = 1.
Power transfer curve for an ideal amplifier (green) with a linear gain of 3 and a real amplifier (red) whose gain gets more compressed as the input increases. At 2 Watts input, the ideal amplifier outputs 6 Watts while the real amplifier outputs ~5 Watts (a gain compression of 0.79 dB). Its OP1dB is just above 2 Watts.
The "gain" of a bipolar transistor normally refers to forward current transfer ratio, either h FE ("beta", the static ratio of I c divided by I b at some operating point), or sometimes h fe (the small-signal current gain, the slope of the graph of I c against I b at a point). The gain of an electronic device or circuit generally varies with the ...
In electronics engineering, frequency compensation is a technique used in amplifiers, and especially in amplifiers employing negative feedback.It usually has two primary goals: To avoid the unintentional creation of positive feedback, which will cause the amplifier to oscillate, and to control overshoot and ringing in the amplifier's step response.
Pole splitting is a phenomenon exploited in some forms of frequency compensation used in an electronic amplifier.When a capacitor is introduced between the input and output sides of the amplifier with the intention of moving the pole lowest in frequency (usually an input pole) to lower frequencies, pole splitting causes the pole next in frequency (usually an output pole) to move to a higher ...
For transistors, the current-gain–bandwidth product is known as the f T or transition frequency. [4] [5] It is calculated from the low-frequency (a few kilohertz) current gain under specified test conditions, and the cutoff frequency at which the current gain drops by 3 decibels (70% amplitude); the product of these two values can be thought of as the frequency at which the current gain ...
For example, when the input to a digital circuit is driven too slowly, the digital input value registered by the circuit may oscillate between 0 and 1 during the signal transition. [1] In other cases, a maximum slew rate is specified [ 2 ] in order to limit the high frequency content present in the signal, thereby preventing such undesirable ...
An instrumentation amplifier can also be built with two op-amps to save on cost, but the gain must be higher than two (+6 dB). [ 4 ] [ 5 ] Instrumentation amplifiers can be built with individual op-amps and precision resistors, but are also available in integrated circuit from several manufacturers (including Texas Instruments , Analog Devices ...