4.57 As we know, resistors are undesirable in MOS IC technology, so the circuit of Fig. P4.57 utilizes the pair M,-M, in lieu of the resistance pair RD-Rpz-. Let Vpp2.5 V and Rss100 2. and suppose Iss has been adjusted so that at de bal ance each FET draws 100 μ. Moreover, let V,n = 1/( 10 V), λ,-1/(20 V), and X, 0.2. (a) Specify the W/L, ratio for the M-M2 pair so as to achieve g 1.25 mA/V, and the W,/L ratio for the M-M, pair so that at de balance (b) Find vomat) and vomi the upper and lower (c) Find a a, and the CMRR both for single- (d) How does a 10% mismatch in the,’s affect the circuit gives Voi-Vo0V limits of the linear region of operation. ended and double-ended utilization. the CMRR for double-ended utilization? Hint: use a(vl- V^)/v. +VOD 02 01 1I sS FIGURE P4.57

image 354 - 4.57 As we know, resistors are undesirable in MOS IC technology, so the circuit of Fig. P4.57 utilizes the pair M,-M, in lieu of the resistance pair RD-Rpz-. Let Vpp2.5 V and Rss100 2. and suppose Iss has been adjusted so that at de bal ance each FET draws 100 μ. Moreover, let V,n = 1/( 10 V), λ,-1/(20 V), and X, 0.2. (a) Specify the W/L, ratio for the M-M2 pair so as to achieve g 1.25 mA/V, and the W,/L ratio for the M-M, pair so that at de balance (b) Find vomat) and vomi the upper and lower (c) Find a a, and the CMRR both for single- (d) How does a 10% mismatch in the,'s affect the circuit gives Voi-Vo0V limits of the linear region of operation. ended and double-ended utilization. the CMRR for double-ended utilization? Hint: use a(vl- V^)/v. +VOD 02 01 1I sS FIGURE P4.57

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images - 4.57 As we know, resistors are undesirable in MOS IC technology, so the circuit of Fig. P4.57 utilizes the pair M,-M, in lieu of the resistance pair RD-Rpz-. Let Vpp2.5 V and Rss100 2. and suppose Iss has been adjusted so that at de bal ance each FET draws 100 μ. Moreover, let V,n = 1/( 10 V), λ,-1/(20 V), and X, 0.2. (a) Specify the W/L, ratio for the M-M2 pair so as to achieve g 1.25 mA/V, and the W,/L ratio for the M-M, pair so that at de balance (b) Find vomat) and vomi the upper and lower (c) Find a a, and the CMRR both for single- (d) How does a 10% mismatch in the,'s affect the circuit gives Voi-Vo0V limits of the linear region of operation. ended and double-ended utilization. the CMRR for double-ended utilization? Hint: use a(vl- V^)/v. +VOD 02 01 1I sS FIGURE P4.57

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