Figure 7.27 A simple but inefficient approach for differential to single-ended conversion. sedr42021_0727.jpg.

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Presentation transcript:

Figure 7.27 A simple but inefficient approach for differential to single-ended conversion. sedr42021_0727.jpg

Circuit for a basic MOSFET constant-current source. sedr42021_0604.jpg

Basic MOSFET Current Mirror. sedr42021_0605.jpg

Figure 7.28 The active-loaded MOS differential pair. sedr42021_0728a.jpg

Figure 7.28 The circuit at equilibrium assuming perfect matching. sedr42021_0728a.jpg

Assignment # 2 Problems 7.11, 7.14, 7.16, 7.20, 7.21, 7.22, 7.23, 7.31, 7.33, 7.34, 7.36, 7.37, 7.38 Due date: 30th March 2012

Figure 7.28 The circuit with a differential input signal applied, neglecting the ro of all transistors. sedr42021_0728a.jpg

Figure 7.29 Determining the short-circuit transconductance Gm =io/vid of the active-loaded MOS differential pair. sedr42021_0729a.jpg

Figure 7. 30 Circuit for determining Ro Figure 7.30 Circuit for determining Ro. The circled numbers indicate the order of the analysis steps. sedr42021_0730.jpg

Figure 7.31 Analysis of the active-loaded MOS differential amplifier to determine its common-mode gain. sedr42021_0731a.jpg

Figure 4.44 (a) Common-source amplifier with a resistance RS in the source lead. (b) Small-signal equivalent circuit with ro neglected. sedr42021_0444a.jpg

Common Mode Gain (Acm) vicm vo vgs3 =-vsg4

Common Mode Gain (Acm) & CMRR vicm vo vgs3 =-vsg4

Common Mode Gain (Acm) & CMRR

Exercise 7.12

The basic BJT current mirror. sedr42021_0608.jpg

A simple BJT current source. sedr42021_0610.jpg

Figure 7.32 Active-loaded bipolar differential pair. sedr42021_0732a.jpg

Figure 7.32 Small-signal equivalent circuit for determining the transconductance Gm=; io/vid. sedr42021_0732a.jpg

Differential Gain Ad vid/2 -vid/2 vo

Differential Gain Ad

Figure 7.32 Equivalent circuit for determining the output resistance Ro =vx/ix. sedr42021_0732a.jpg

Figure 7.33 Analysis of the bipolar active-loaded differential amplifier to determine the common-mode gain. sedr42021_0733.jpg

Figure 7.33 Analysis of the bipolar active-loaded differential amplifier to determine the common-mode gain. sedr42021_0733.jpg

Common Mode Gain vicm vbe3 = -vbe3 vo i1 i2

Common Mode Gain

Common Mode Gain

Common Mode Gain

Common Mode Rejection Ratio (CMRR)