D 8.63 For a cascode current source such as that in Fig. 8.32, show that if the two transistors are identical, the current I supplied by the current source and the output resistance Ro are related by IRo = 2 VA 2/ VOV . Now consider the case of transistors that have  VA  = 4 V and are operated at  VOV  of 0.2 V. Also, let μpCox = 100 μA/V2. Find the W/L ratios required and the output resistance realized for the two cases: (a) I = 0.1 mA and (b) I = 0.5 mA. Assume that VSD for the two devices is the minimum required (i.e.,  VOV ).

8.63 - D 8.63 For a cascode current source such as that in Fig. 8.32, show that if the two transistors are identical, the current I supplied by the current source and the output resistance Ro are related by IRo = 2 VA 2/ VOV . Now consider the case of transistors that have  VA  = 4 V and are operated at  VOV  of 0.2 V. Also, let μpCox = 100 μA/V2. Find the W/L ratios required and the output resistance realized for the two cases: (a) I = 0.1 mA and (b) I = 0.5 mA. Assume that VSD for the two devices is the minimum required (i.e.,  VOV ).

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images - D 8.63 For a cascode current source such as that in Fig. 8.32, show that if the two transistors are identical, the current I supplied by the current source and the output resistance Ro are related by IRo = 2 VA 2/ VOV . Now consider the case of transistors that have  VA  = 4 V and are operated at  VOV  of 0.2 V. Also, let μpCox = 100 μA/V2. Find the W/L ratios required and the output resistance realized for the two cases: (a) I = 0.1 mA and (b) I = 0.5 mA. Assume that VSD for the two devices is the minimum required (i.e.,  VOV ).

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