A current source is to be implemented using a current mirror. The circuit is shown in Figure 1. Assuming the transistors to be matched each with a beta of 200, what value of R is needed so that the current I = 2 mA? Suppose that we replace the transistors in Figure 1 with two matched transistors with beta = 100. For the same R found in 1), what is the new value of I? What happens to I if we change transistors again so that beta = 500?

58 3 - A current source is to be implemented using a current mirror. The circuit is shown in Figure 1. Assuming the transistors to be matched each with a beta of 200, what value of R is needed so that the current I = 2 mA? Suppose that we replace the transistors in Figure 1 with two matched transistors with beta = 100. For the same R found in 1), what is the new value of I? What happens to I if we change transistors again so that beta = 500?

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images - A current source is to be implemented using a current mirror. The circuit is shown in Figure 1. Assuming the transistors to be matched each with a beta of 200, what value of R is needed so that the current I = 2 mA? Suppose that we replace the transistors in Figure 1 with two matched transistors with beta = 100. For the same R found in 1), what is the new value of I? What happens to I if we change transistors again so that beta = 500?

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