Widlar current source The Widlar current source, a variation of the simple current mirror, was advanced by Bob Widlar in the mid 1960s. But there is a modification in the output transistor.

The current source regulates relatively well from 1 to 900Ω. eecs140 analog circuit design lectures on current sources simple source (cont.) The circuit of Figure 5b, named for its inventor Bob Widlar, achieves this goal by means of a resistor R in series with Q2 to reduce Q2 ’s base-emitter voltage drop as Equation 5

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..

I also me his brother at the Analog Aficionado dinner. A Wilson current mirror or Wilson current source, named after George Wilson, is an improved mirror circuit configuration designed to provide a more constant current source or sink.

Wilson current source is a current mirror while Widlar current source is independent from reference current. 3 \$\begingroup\$ I need help solving this problem. The circuit of Figure 5b , named for its inventor Bob Widlar, achieves this goal by means of a resistor R in series with Q 2 to reduce Q 2 ’s base-emitter voltage drop as I believe the current in the left side of the circuit equals the current in the right side. The Widlar source is an important analog building block. I ran it in pspice, and did a sweep of load resistors from 1 to 2.7kΩ.

I also me his brother at the Analog Aficionado dinner. The structure is shown in figure 11.9. What is the idea behind this circuit? 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.

I've designed this Widlar current source to deliver 5mA of current. The only difference between the two circuits is the introduction of an emitter resistor.

Widlar Current Source The Widlar current source differs from the basic current mirror in one important way – a resistor (R 2) is added to the emitter circuit of transistor Q 2. ... Widlar current source. Widlar current source The Widlar current source, a variation of the simple current mirror, was advanced by Bob Widlar in the mid 1960s. 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.

The only difference between the two circuits is the introduction of an emitter resistor. Ask Question Asked 5 years, 7 months ago. So it is hard to say which is better. Ask Question Asked 5 years, 7 months ago. The simple current source is imperfect as the load affects the current. Widlar Current Source In DC biasing applications it is often necessary to synthesize a current i O << i I .

At some point if you want to have a current source that is fixed in uA, you need a primary voltage or current source. \$\begingroup\$ The Widlar current source relies on the matching of the base-emitter current/voltage and thermal characteristics of Q1 and Q2. Each has different advantages and their uses are for different purposes. current source 4.1.0) The Circuit 4.1) Basic Two-Transistor MOSFET Current Source Figure 10.2: Basic two-transistor BJT current source. Since multistage amplifier systems often have high gain, bias currents must be small.

Fig I10.16: Basic two-transistor N-MOSFET current source. Widlar Current Source - Output Impedance - Current Dependence of Output Resistance... dependence of the resistor values is in ohms, and is the output resistance due to the Early effect when VCB = 0 V (device parameter VA is the Early voltage). I ran it in pspice, and did a sweep of load resistors from 1 to 2.7kΩ. I never had the pleasure of meeting Bob Widlar, but I did learn about his Widlar Current Source at NYU in my undergraduate studies in 1969 (See Bob Widlar cherry-bombs the intercom speaker on EDN.