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Unformatted text preview: Signal Generation and Conditioning Passive Components • Complex – Amplitude and phase • Impedance – Resistor Z = R – Inductor Z = j ϖ L • Short at DC – Capacitor Z = 1/( j ϖ C) • Short at high frequency • Series: Z=Z 1 +Z 2 • Parallel:1/Z=1/ Z 1 + 1/Z 2 In Series • Z=Z 1 +Z 2 • Voltage Divider • Maximize Power Delivered to Load • Impedance Matching R1 51ohm V1 1V 1000MHz 0Deg R2 51ohm O L L L L L O L O L Z Z Z V P Z Z Z V V = = + ⋅ = 2 LC Resonator • LC in parallel – 1/Z=1/ Z 1 + 1/Z 2 • Frequency Response – Resonance frequency – Z at f R – Effect of R – Bandwidth – Q • What about LC in series? LC f R π 2 1 = V1 1V 1000Hz 0Deg C1 1.0nF L1 3.0mH R1 100kohm Making Inductors • Cylindrical inductor, N turns of wire; The ideal inductance is given by when d is much greater than the diameter http://hibp.ecse.rpi.edu/~connor/education/EIexpprojlect/exp03.ppt http://www.ee.surrey.ac.uk/Workshop/advice/coils/ Henries d r N L c ) ( 2 2 π μ = Circuit Practice • At high frequencies no circuit elements are simple. – Capacitor has series stray inductance, parallel leakage resistance. – The junction capacitances of transistors must be considered. – A wire has stray inductance and capacitance causing unexpected feedback. – Connecting wire is a transmission line. • Ground plane and isolation are extremely important. • Use decoupling capacitors and negative feedback. Amplifiers • Class A CE Amplifier – Tuned – Inductor (choke) or transformer – Configuration – Gain vs Z C – A(f) – Linear Q1 2N3904 L1 3.0mH C2 1.0uF R2 100kohm V1 1.5V 100kHz 0Deg C3 1.0uF R4 1.0kohm R1 10kohm R3 47kohm C1 1.0nF Amplifiers • Other Configurations – Common base amplifier (http://www.eee.bham.ac.uk/collinst/walkthroughs/cbamp/)(http://www....
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This note was uploaded on 02/24/2011 for the course EE 513 taught by Professor Dr.paololiu during the Spring '11 term at SUNY Buffalo.
 Spring '11
 Dr.PaoLoLiu
 Frequency, Impedance

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