Hello!
I was studying transistor amplifiers at this page: http://www.tpub.com/content/neets/14180/css/14180_40.htm
I couldn't undestand how this circuit produces two outputs with same amplitude? One thing pops into my mind is that it is done with resistors.. But is it practical?
Here what this page says:
I was studying transistor amplifiers at this page: http://www.tpub.com/content/neets/14180/css/14180_40.htm
I couldn't undestand how this circuit produces two outputs with same amplitude? One thing pops into my mind is that it is done with resistors.. But is it practical?
Here what this page says:
If the output signals must be larger in amplitude than the input signal, a circuit such as that shown in figure 1-28 will be used. Figure 1-28 shows a two-stage phase splitter. C1 couples the input signal to the base of Q1. R1 develops the input signal and provides bias for the base of Q1. R2 provides bias and temperature stability for Q1. C2 decouples signals from the emitter of Q1. R3 develops the output signal of Q1. Since Q1 is configured as a common-emitter amplifier, the output signal of Q1 is 180º out of phase with the input signal and larger in amplitude. C3 couples this output signal to the next stage through R4. R4 allows only a small portion of this output signal to be applied to the base of Q2. R5 develops the input signal and provides bias for the base of Q2. R6 is used for bias and temperature stability for Q2. C4 decouples signals from the emitter of Q2. R7 develops the output signal from Q2. Q2 is configured as a common-emitter amplifier, so the output signal is 180º out of phase with the input signal to Q2 (output signal from Q1). The input signal to Q2 is 180º out of phase with the original input signal, so the output from Q2 is in phase with the original input signal. C5 couples this output signal to the next stage. So the circuitry shown provides two output signals that are 180º out of phase with each other. The output signals are equal in amplitude with each other but larger than the input signal.