Recent content by erece

the 2 signals shown are used for modulating ( DSB-SC) a carrier with frequency fc. Now i need to find the similarities and differences between their time domain representation. Clearly the both will have same envelope. Now i tried for the difference part but could not find it. One possibility...

sorry in the first post i did some mistake. In that i wrote the formula for voltage gain of common base as Av = (gm/RS)(RcllRL)(re ll RE ll RS) and for my circuit the second stage is common base for which RE is ∞ and no RL . So gain expression will become Av = (gm2/RS)(Rc)(re ll RS) i forgot...

if i need to model the second stage as thevenin voltage plus thevenin resistance then i need to remove the first stage to calculate Vth, but second stage does not have any independent source so Vth should be 0 am i right ??

yes.

Homework Statement for the circuit shown , if i want to calculate gain of the second stage then do i need to consider the output resistance of first stage as the source resistance for the second stage ? Homework Equations The Attempt at a Solution first stage is common collector...

Homework Statement for the common collector configuration shown i need to find the voltage gain. The voltage gain formula is AV = (β+1)(roll RE)/(rπ+(β+1)(roll RE) But in the circuit RE is absent . So how do we consider it ?? Nothing is given about the current source. from the circuit...

this is the solution given in the textbook. Still i have a doubt that how do we come to know that we have to observe the state of D1 & D4 ?

i got it nascent is there a way to find that which diodes will be ON and which will be OFF for a particular input voltage without calculating the currents ?

can you tell me what will be the output voltage Vo for Vi = 5V ? According to me, Vi=5V so all diodes can be ON & in that case VA = Vi+0.7 = 5.7V and Vo = 5.7-0.7 = 5V, this will make Vc = 4.3 V again possible. So is this the correct output for Vi=5V ?

Homework Statement I need to find the output voltage mathematically or graphically Homework Equations The Attempt at a Solution My approach : as long as the Vi is < 9.3 V , the diode D1 will be ON because in that case VA will be < 10 V and current can flow through 10k resistor...

please tell the output voltage mathematically or graphically

how can i find the number of zeros in a circuit ? i am attaching a circuit of emitter follower in which i want to find the high frequency response. Instead of deriving the whole transfer function , i am using OPEN CIRCUIT time constant method to find the poles and midband gain formula by...

what is the unit step response of a high pass RC filter ? I want to calculate using transfer function approach. My solution : Y(s)/X(s) = RCs/(1+sRC) X(s)=1/s Y(s)=RC/(1+sRC) taking inverse laplace transform we should get y(t)=exp(-t/RC) But if we consider Y(s)=RC/(1+sRC) RCsY(s)...

chapter is based on bjt amplifiers... i agree to both of you , but can you tell me " Why it is more normal to use other circuitry than resistors to achieve this bias in CC output stages ?? " I think gain stage and output buffer are dc coupled. So operating point of output buffer is fixed...

I am studying basics of analog circuit design from microelectronics circuit analysis by donald neamen And in that i encountered a problem in design of audio amplifier. The question and solution is given in the attachment. And i want to know that in the output emitter follower why there are no...