By Muhammad Waqas Supervised by Prof. Dr.-Ing. K....
Transcript of By Muhammad Waqas Supervised by Prof. Dr.-Ing. K....
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ByBy
Muhammad Waqas
Supervised by
Prof. Dr.-Ing. K. Solbach
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Outline� Motivation
� Introduction to IQ-Modulation
� Simulation Circuit
PCB design in Eagle� PCB design in Eagle
� Test Results
� Conclusion
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Motivation� Design of a Vector Modulator for “7-Tesla MRT
Ganzkörperspule” at 300 MHz.
� The IQ modulator replaces more expensive
components like digitally controlled phase shifters components like digitally controlled phase shifters
and attenuators.
� A bank of four vector modulators (4-channel) is to be realized and characterized with respect to the voltage-amplitude and voltage-phase conversion properties.
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I-Q Modulation
� In-phase / quadrature Modulation
Signals to be modulated are divided in to two signal � Signals to be modulated are divided in to two signal components , i.e I and Q
� Modulation of Digital and Analog signals
� Examples : PSK, QAM, QPSK
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I-Q Modulation
� Analog Modulation: Two signals 90° out of phase to eachother are modulated.eachother are modulated.
� Digital Modulation: Serial bit sequence is transformed into parallel bit sequence, hence we get two components I(t) and Q(t).
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I-Q Modulation� Modulation of two Signals I(t) und Q(t)
I
90
Q
+Carrier
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Simulation Circuit
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Simulation Circuit
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Simulation Circuit
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PCB Design
� Two Frequency mixers : LRMS-1LH
Power Splitter / Combiner: LRPQ-320J� Power Splitter / Combiner: LRPQ-320J
� Power Splitter / Combiner : JPS-2-1+
� RC- Lowpass filter
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PCB Design
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PCB Design
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PCB Design
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Test Results
� DC Volatge equals to zero
� S11 = -21.5 dB
S21 = -42 dB� S21 = -42 dB
� S12 = -42 dB
� S22 = -8.5 dB
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Test Results� For maximum DC values
� S11 = -18.5 dB
� S21 = -6.67 dB
S12 = -6.67 dB� S12 = -6.67 dB
� S22 = -13.77 dB
� Dynamic range of the designed Vector modulator is calculated to be 35.43 dB
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Test Results
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Test Results
� Equation: Delta Q = (-) |C| * I * |Q| (Reason not known).known).
� The maximum phase error is measured to be 6°.
� Maximum amplitude was measured to be 6.7dB.
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Test Results
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Test Results
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Conclusion
� The designed Vector modulator has the dynamic range of 35.46 dB.range of 35.46 dB.
� Measured Results show the good quality of Output.
� Unusual behaviour of the I-Q plot was summarized by an equation, although reasons are still unknown.
� Circuit can also be used as Vector demodulator.
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THANKYOU EVERYONE FOR YOUR THANKYOU EVERYONE FOR YOUR
ATTENTION !