Chapter 6 Differential and Multistage Amplifiers3

Quiescent analysis if the circuit is perfectly

This preview shows page 7 - 20 out of 34 pages.

Quiescent analysis: if the circuit Is perfectly matched, no output Current flows through the output Terminal. m d g v 2 m d g v 2 m d g v 2
Image of page 7

Subscribe to view the full document.

Determine the Transconductance T m m V I g G 2 = = 2 ) 2 / ( case for the 2 / // 4 2 4 2 o m d o d o d m o o o o o o o o r g v v A r v g v r r r R r r R = = = = = =
Image of page 8
Differential Gain The differential gain is determined as G mRo When Input differential resistance 4 2 // ( o o m o m d r r g R G A = = 2 0 2 1 A r g A o m d = = o o o r r r = = 4 2 π r R id 2 =
Image of page 9

Subscribe to view the full document.

Common-Mode Gain and CMRR Ø Common-mode gain: Ø CMRR EE o EE o cm R r R r A 3 4 3 4 2 2 β β - 2245 - = ) )( // ( 4 3 4 02 o EE o m r R r r g CMRR β =
Image of page 10
Differential-to-Single-Ended Conversio n A simple but inefficient approach for differential to single-ended conversion. Drawback: Lose a factor of 2(or 6 dB)
Image of page 11

Subscribe to view the full document.

The Active-Loaded MOS Differential Pair The active-loaded MOS differential pair.
Image of page 12
The Active-Loaded MOS Differential Pair
Image of page 13

Subscribe to view the full document.

The Active-Loaded MOS Differential Pair The circuit with a differential input signal applied, neglecting the ro of all transistors.
Image of page 14
Differential Gain of the Active-Loaded MOS Pair The output resistance ro plays a significa nt role in the operation of active-loaded a mplifier. Asymmetric circuit. Half-circuit is not available. The gain will be determined as GmRo
Image of page 15

Subscribe to view the full document.

Short-Circuit Transconductance Determining the short-circuit transconductance Gm = io / vid
Image of page 16
Short-Circuit Transconductance m m g G =
Image of page 17

Subscribe to view the full document.

Output Resistance Circuit for determining Ro . The circled numbers indicate the order of the analysis steps.
Image of page 18
Output Resistance
Image of page 19

Subscribe to view the full document.

Image of page 20
You've reached the end of this preview.
  • Fall '10
  • ChengJianping
  • Transistor, Bipolar junction transistor, RO, Electronic amplifier, Widlar current source

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern