explain numerical methods For this transistor: Beta 100 A/A CPI = 2 pF, CMU 1 pF

Question

explain numerical methods

For this transistor: Beta 100 A/A CPI = 2 pF, CMU 1 pF, Co = .5 pF VA 100 V 15VIC IB IE CC1 Cinput Coutput r-load o gain(V/V) Q1 C-in I C-out CC1 ISIG ROUTAMP sc @w What feedback topology is this? What is A (and its units)? What is B (and its units)? What is (1+AB) (and its units)? What is R11? What is R22? What is R-IN? What is R-OUT? What is AF (and its units)? What is AF(V/V) = VLOAD / VSIG? What is upper 3 dB point after feedback? What is lower 3dB point after feedback?

Explanation / Answer

1)

since output voltage is feedback to input side and its connected in shunt way

Hence voltage shunt feedback topology or shunt shunt feedback

2)

A is voltage gain without feedback

unitless or v/v

3)

beta is feedback factor

unitless

4) (1+AB) is factor by which open loop gain is reduced

unitless

5)

R11 is transfering feedback resistance to input side

R11=10K/(1-A)

6)

R22 -> transfering output resistance to output side

R22 = (1-1/A) 10K

7)

upper 3dB point after feedback = 3 db upper before feedback * ( 1+AB)

8)

lower 3dB point after feedback = 3 db Lower before feedback / ( 1+AB)

9)

Af=A/(1+AB)

unit is unitless or v/v

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