cmos Unit 4_ 2024.ppt
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The document discusses the frequency response of amplifiers, specifically the common gate stage, noting that input and output nodes are isolated if channel length modulation is neglected. It highlights the circuit's lack of Miller multiplication, which allows for potential wide bandwidth, but cautions that low input impedance may affect the preceding stage. Additionally, it points out that to achieve reasonable gain, the dc level of the input signal should be kept low.
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cmos Unit 4_ 2024.ppt
- 1. Unit- 4 Frequency Response of Amplifiers
- 2. Common Gate Stage • the input and output nodes are “isolated” if channel length modulation is neglected. • An important property of this circuit is that it exhibits no Miller multiplication of capacitances, potentially achieving a wide band. • Note, however, that the low input impedance may load the preceding stage. • Furthermore, since the voltage drop across RD is typically maximized to obtain a reasonable gain, • the dc level of the input signal must be quite low.
- 4. Cascode Stage Figure 6.34 High-frequency model of a cascode stage.
- 5. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Slides prepared by Travis N. Blalock, University Current Mirrors Ch. 5 # 5
- 6. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Slides prepared by Travis N. Blalock, University Current Mirrors Ch. 5 # 6