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6.3 Advanced current mirrors: wide-swing

Chapter 6 Figure 12 Advanced current mirrors: wide-swing Q3 and Q4 acts like a single-diode connected transistor to create the gate source voltage for Q3. Including Q4 helps lower the Vds3 so that it matches Vds2. Other than that, Q4 has little effect on the circuit s operation. Assume ID2=ID3=ID5 VGS1=VGS4 If n=1 Also we need Chapter 6 Figure 12 Advanced current mirrors: wide-swing In most applications, it is desirable to make (W/L)5 smaller than that given in the Figure so that Q2 and Q3 can be biased with a slightly larger Vds. This would help counter the body effect of Q1 an Q4, which have their Vt increased. To save power consumption, Ibias and Q5 size can be scaled down a little bit while keeping the same gate voltage.

Folded-cascode OpAmp A differential-input single-ended output folded-cascode OpAmp is shown below. The current mirror in the output side is a wide-swing cascode one, which increases the gain. The basic idea of the FC-OpAmp is to apply cascode transistors to …

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