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2.Siggen - Signal Generation and Conditioning Passive...

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Signal Generation and Conditioning
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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
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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
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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
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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/EIexp-proj-lect/exp03.ppt http://www.ee.surrey.ac.uk/Workshop/advice/coils/ Henries d r N L c ) ( 2 2 0 π μ =
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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.
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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
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Amplifiers Other Configurations Common base amplifier (http://www.eee.bham.ac.uk/collinst/walkthroughs/cb-amp/) Class B amplifier Class C amplifier
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