Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 58, Problem 8SQ
What do selsyns look like?
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4. The system shown below must recover both messages from the frequency-division multiplexed signal
whose spectrum is input to it.
a) Determine the frequency of the local oscillator;
b) determine the bandwidths B, and B2 of the two low-pass filters; and
c) sketch the spectra of the output signals, numbering key points on the frequency & amplitude axes.
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f(kHz)
Wipw
-12V
4 cos(27fLal)
LPF1
MS)
LPF2
MS
3. In a QAM receiver using synchronous detection, the local oscillator produces an accurate cosine wave
2cos(x), but the two receiver branches have mismatched lengths, causing a phase delay of -1/(3+N)
radians in one branch, as shown. Compute the component of the quadrature channel message appearing in
the in-phase output, and compute the component of the in-phase message appearing in the quadrature output.
QAM
signal
Low-pass
filter
151(1)
(1)
200001
#12
2 sin[)]
Ap=
Low-pass
-л(3+N)
filter
x2(1)
my(1)
2. For the message signal m(r) shown below:
-2
a) sketch the FM waveform pru if -2xx 10', k-100Nx. Specify the maximum instantaneous
frequency and the minimum instantaneous frequency values in kHz.
b) sketch the PM waveform pru if -2x10' and k,-/4. As well as the maximum and minimum
instantaneous frequency, specify the value of the phase shift at key points.
5x10*N-
ww
N=15
Chapter 58 Solutions
Electric Motor Control
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- Don't use ai to answer I will report you answerarrow_forwardPlease describe how to do each step in detail. thanksarrow_forward2. For the OPAMP below: g) Grounding the inputs, perform a DC analysis (assume beta is infinite and VBE=0.7V and neglect the early voltage),calculate the DC currents and voltages everywhere in the circuit (all the collector and emitter currents and voltages aswell as the output voltage). Note that Q4 is 4 times as big as Q9 and Q3h) If Q1 and Q2 have a beta of 100, calculate the input bias current to the opampi) What is the input common mode range of this opamp?j) Calculate the common mode gain if the early voltage of Q3 and Q6 is 50Vk) Calculate the differential gain vo/vid of this circuitI) Calculate the input and output impedance of the opamp assuming beta is 100m) Calculate the input referred offset (Vos) if R2=21Karrow_forward
- 1. For the difference amplifier below, R1=R3=10K, R2=R4=50k, assume opamp is ideala) Find the differential mode gain, Admb) Find the input impedance (differential, between wi and va)c) Find the common mode gain in the presence of resistor mismatch (If R3=R1+ deltaR1, R4=R2+ deltaR2, deltaR1=100, deltaR2=500)d) Find the common mode rejection ratio (CMRR)e) Find the input impedance and output impedancef) If the OPAMP has an input current of 100uA, find the output offset voltage, set Vi1 = Vi2=0Varrow_forwardFor the circuit shown, I-20 mA, R₁ =10000 2, R2 =2000 Q, R3 -2000 Q, R₁-6000 2, Vcc 5 V and the OPAMP is ideal with regions of operation are considered. The output current lo in mA is (choose the closet value): R₂ Is R₁ W VCC -VCC The relative tolerance for this problem is 1 %. -0.458 -0.833 6.667 -6.667 ○ 0.458 0.833 w R3 w RLarrow_forwardFor the circuit shown, let R₁-4, R2-50, R3-2, R4-77 and Vin-18. Find the current I₁ and voltage Vo as follows: Use op-amp building blocks to determine the voltage Vo1: V01 = Then use Vo1 to find the current 11: 1₁ = Find the voltage Vo: Vo= R1 www Vin R₂ ww V01 R3 The relative tolerance for this problem is 9 %. + R4 www +5°arrow_forward
- For the circuit shown, let Vs1 = 13, Vs2 = 7 R1-10, R2= 50, assume ideal-op-amp, and find • The current Is • The output voltage Vo= VSI A S R₁ ww 1 R₂ www V₁₂ + Varrow_forwardFor the circuit shown, let R₁ =16 Q, R₂ =48 2, R3 = 28 2, R4 =84 02, R5 -2002, R6 -80 2, and V₁ =4 mV. Assume ideal op-amp, find (round your answer to three digits) : Va= (MV) Vb = (MV) (mA) Vout = (MV) R₁ R₂ V₁ + R3 Vb W The relative tolerance for this problem is 7 %. ww R4 24 R5 55 R6 VOUTarrow_forwardFor the circuit shown, find the voltage Vo and current l。. Let R₁=8, R2=1, R3-11 and V₂-3. V S (+1 || w R₂ R1 + R3 Vo The voltage Vo is: The current lo is: The relative tolerance for this problem is 3 %.arrow_forward
- For the circuit shown, find currents 11, 12, 13, and the voltage Vo. Assume ideal op-amp, and let R₁=3, R2-40, Ro=85 and 1-6 The current I₁ is: The current 12 is: The current 13 is: The voltage Vo is: R₂ w R₁ 13 w Roarrow_forwardFor the circuit shown, let v₂ = 9, R₁=86, R2= 15, R3 =7, assume ideal-op-amp, and find • The current l₂ = • Voltage gain, Av= Vo/Vs= • The output voltage vo = A US 1+ 1. R₁ R₂ R3 10 +arrow_forwardFor the op-amp circuit shown, find the voltage Vo, and the current lo. Let R₁=8, R2=58, R3-27 and V₂-101. R1 + R₂ ww + V + The voltage Vo The current lo = = The relative tolerance for this problem is 3 % R3arrow_forward
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