Mixing network - Signal gets multiplied by -1 after passing

Q.  After passing through which circuit/network ,does the signal Xd (output signal obtained by taking the difference of two input signals) get multiplied by '-1'?
- Published on 23 Sep 15

a. Amplifier circuit
b. Feedback network
c. Mixing network
d. Sampling network

ANSWER: Mixing network

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    Discussion

  • Satyawati   -Posted on 30 Sep 15
    The mixer network generates an output which is the difference of input signals. Hence, 'Xc' is known as the difference or error signal.

    Generally, the signal 'Xd' gets multiplied by 'A' when it is passed through an amplifier. The same signal again gets multiplied by 'β',when it is passed through the feedback network .

    Also, the signal 'Xd' gets multiplied by '-1' especially when it passes through the mixing network. Even, the signal gets multiplied by '-Aβ' while traveling on the path in order to obtain the loop gain.

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