lec 6----High freq response CE BJT

lec 6----High freq response CE BJT - Assignment Quiz 1...

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Unformatted text preview: Assignment Quiz 1 Assignment Quiz A The analysis of the high frequency response of a CS amplifier is based on assumption that the resistance of the signal source is large and thus its interaction with the i/p capacitance produces a dominant pole that determines the upper 3-dB frequency . There are situations however , when the CS amplifier is fed with a very low resistance . Fig 1 shows the equivalent cct with an ideal voltage Source having = 0. By writing a node equation at the o/p, show that the transfer function is given as: At frequencies the s term in the numerator can be neglected. In such Case what is the upper 3-dB frequency? Compute the value of & for the Case =0.5pF, =2pF, =4mA/V, and 2 in C H f sig R L gd L m gd L m sig O R C C s g C s R g V V ' ' ) ( 1 ) / ( 1 + +-- = ) ( gd m C g < < M A H f gd C L C m g ' L R Assignment Quiz C Draw a complete high frequency model of the following circuit. (including all the capacitors & resistors) Be sure to draw pi/T model according to the configuration. Identify the two amplifier stages. 3 4 BJT Capacitance & Frequency Response 5 High Frequency Hybrid Model The BJT amplifiers we have examined so far are all low frequency amplifiers. For large values of DC blocking capacitors and for frequencies of ten to hundred of kHz the simple small signal model that we have used will work well....
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lec 6----High freq response CE BJT - Assignment Quiz 1...

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