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Figure 2: Adding an emitter resistor decreases gain, but increases linearity and stability. Common-emitter amplifiers give the amplifier an inverted output and can have a very high gain that may vary widely from one transistor to the next. The gain is a strong function of both temperature and bias current, and so the actual gain is somewhat ...
A Widlar current source is a modification of the basic two-transistor current mirror that incorporates an emitter degeneration resistor for only the output transistor, enabling the current source to generate low currents using only moderate resistor values. [1] [2] [3]
The theorems are useful in 'circuit analysis' especially for analyzing circuits with feedback [1] and certain transistor amplifiers at high frequencies. [ 2 ] There is a close relationship between Miller theorem and Miller effect: the theorem may be considered as a generalization of the effect and the effect may be thought as of a special case ...
Figure 1: An ideal current source, I, driving a resistor, R, and creating a voltage V. A current source is an electronic circuit that delivers or absorbs an electric current which is independent of the voltage across it. A current source is the dual of a voltage source. The term current sink is sometimes used for sources fed from a negative ...
The current-follower stage presents a load to the common-source stage that is very small, namely the input resistance of the current follower (R L ≈ 1 / g m ≈ V ov / (2I D) ; see common gate). Small R L reduces C M. [2] The article on the common-emitter amplifier discusses other solutions to this problem.
The transistor continuously monitors V diff and adjusts its emitter voltage to equal V in minus the mostly constant V BE (approximately one diode forward voltage drop) by passing the collector current through the emitter resistor R E. As a result, the output voltage follows the input voltage variations from V BE up to V +; hence the name ...
If the 4-4-2-2-1+1 model were used this year, the SEC and Big 12 would have each gotten one more team into the field (Alabama and Iowa State). The change to the 4-4-2-2-1+1 model could come with ...
See also an example of a mirror with emitter degeneration to increase mirror resistance. For the simple mirror shown in the diagram, typical values of will yield a current match of 1% or better. Figure 2: An n-channel MOSFET current mirror with a resistor to set the reference current I REF; V DD is positive voltage.