4. However, we can put resistors in all of the emitter circuits, or we can use the cascode mirror configuration. A proper current mirror circuit can be characterized using three specifications.

Figure 3 shows a bipolar current mirror with emitter resistors to increase its output resistance. Pre-lab assignment.

Current mirror as differential amplifier. Ask yourself what happens if you add two resistors. In the classical current mirror the emitters of the transistors are grounded (no emitter resistors). Current Transfer Ratio. T1 and T2 are PNP transistors and form together a current mirror. Current mirror circuits are widely used, especially within integrated circuit technology. One from the emitter of transistor "2" and the collector of the current mirror transistor and one from the emitter of "3" to the collector of the current mirror.

2. Another way to provide different current magnitudes at different mirror outputs is to change the areas of the transistor emitters. 1.

Current mirrors on a chip are made with well-matched transistors and usually no emitter resistors, and have a different set of tradeoffs. The Red Probe will show the current of Q1 transistor in simulation. In the Widlar current mirror there is a resistor only in the emitter of the output transistor. Transistor Q 1 is diode connected, which is to say its collector-base voltage is zero.

Derive a symbolic expression for the output resistance r

BJT Mirror with Base Current Compensation Figure 3 shows the basic current mirror with a third transistor added. emitter resistors might be 100Ω.

This is the popular current mirror circuit with 2 EMITTER DEGENERATION RESISTORS R1 and R2.

VB1=VB2( The base of two BJT's are connected to each other).

A current mirror circuit has lots of primary and secondary dependencies and that is the main concern to characterize current mirror circuit. With these resistors, Rte2 is no longer zero so that the output resistance is increased. I want to make a current mirror.

I made the current mirror also with R1=150R so I=28mA, but then the current in R3 is as follow with different …

Basically, the current thru each side is inversely proportional to each's emitter resistance. T3 acts as a regulating valve which increases the current through the current mirror as Input A gets more power while T4 kind of does the opposite by draining current from the mirror with increasing input B power.

Or more simply, add two emitter resistors to … The simple two transistor implementation of the current mirror is based on the fundamental relationship that two equal size transistors at the same temperature with the same V GS for a MOS or V BE for a BJT have the same drain or collector current. A current mirror is a circuit, which ... loop formed by the 2 base-emitter voltages and the voltage drops across the 2 emitter resistors, respectively. The implementation of the current mirror circuit may seem simple but there is a lot going on. As you can see.

Figure 4 shows the small-signal circuit equivalent to Figure 3. It is given by rout= ric2 which can be much greater than r02. Current Mirrors I Objective: This lab introduces the concept of current mirrors. I did do some simulations and that works, but when I make a real current mirror this does not work.

current mirror with emitter resistors