introduction to electronic circuit
DESCRIPTION
Electronic circuits include a diode, a BJT (Bipolar Junction Transistor), and a FET (Field Effect Transistor). In this presentation, we briefly summarize the most important characteristics of the diode, transistor, amplifier, filter, and mixer.TRANSCRIPT
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Introduction to Electronic Circuit
Electronic Circuit DesignElectronic Circuit DesignCHO, Yong HeuiCHO, Yong Heui
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Electronic Circuits Electronic Circuits DesignDesign
EM Wave LabEM Wave Lab2
1. Diode
Nonlinear device
No voltage drop External circuits
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Electronic Circuits Electronic Circuits DesignDesign
EM Wave LabEM Wave Lab3
iD = 0, vD ≤ VD0
iD = (vD - VD0) / rD , vD ≥ VD0
Piecewise linear model
1. Diode
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Electronic Circuits Electronic Circuits DesignDesign
EM Wave LabEM Wave Lab4
Mode EBJ CBJ
Cutoff Reverse Reverse
Active Forward Reverse
Rev. Act. Reverse Forward
Saturation Forward Forward
Device structure
2. BJT
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Electronic Circuits Electronic Circuits DesignDesign
EM Wave LabEM Wave Lab5
iC = ISeVBE/VT·(1+vCE/VA)
∂iC
∂vCE
ro ≡vBE=constant
-1
I-V characteristics
2. BJT
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Electronic Circuits Electronic Circuits DesignDesign
EM Wave LabEM Wave Lab6
OP amp 의 어떤 terminal 도 ground에 연결되어 있지 않음 .
3 signal terminals and 2 power terminals (Not displayed)
Differential input voltage, single-ended output voltage
Infinite input impedance ii = 0
Zero output impedance
Zero common-mode gain (v2=v1 vo=0)
Infinite open-loop gain A
Infinite bandwidth : A is constant at any frequencies.
*Differential input voltage, single-ended output voltage
Ideal OP Amp
3. OP amp
Ideal OP amp
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Electronic Circuits Electronic Circuits DesignDesign
EM Wave LabEM Wave Lab7
Selection of active device
4. Amplifier
pHEMT amplifier with package
Gain [dB]
Bandwidth [Hz]
Stability: oscillation
Noise figure [dB]: LNA
P1dB [dBm]: PA
Characteristics of active device: bias
Bare chip
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Electronic Circuits Electronic Circuits DesignDesign
EM Wave LabEM Wave Lab8
Bias design
Assignment of AC and DC path
4. Amplifier
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Electronic Circuits Electronic Circuits DesignDesign
EM Wave LabEM Wave Lab9
LNA (Low Noise Amplifier)
Noise figure: 2 dB Amplifier gain: 15 dB Return loss: 15 dB Reverse isolation: 20 dB Impedance matching: power and noise
4. Amplifier
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Electronic Circuits Electronic Circuits DesignDesign
EM Wave LabEM Wave Lab10
SNR: signal to noise ratio Noiseless system: NF = 1 Noisy system: NF > 1 Ground
Noise figure (NF)
4. Amplifier
in
out
out
in
out
in
N
N
S
S
SNR
SNRNF
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Electronic Circuits Electronic Circuits DesignDesign
EM Wave LabEM Wave Lab11
Simulation of LNA
PortOUTNum=2
PortINNum=1
CC2C=1.0 pF
CC1C=1.0 pF
LL3
R=L=1.0 nH
LL2
R=L=1.0 nH
TSMC_CM025RF_PMOS_RFPMOS_RF1
finger=16width=10 umlength=0.24 umType=2.5V twin-well
TSMC_CM025RF_NMOSNMOS2
Width=0.30 umLength=0.24 umType=2.5V_nom
LL1
R=L=1.0 nH
RR3R=50 Ohm
RR2R=50 OhmTSMC_CM025RF_NMOS
NMOS1
Width=0.30 umLength=0.24 umType=2.5V_nom
RR1R=50 Ohm
HP ADS (Advanced Design System)
AC and DC path
4. Amplifier
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Electronic Circuits Electronic Circuits DesignDesign
EM Wave LabEM Wave Lab12
HPA (High Power Amplifier)
Output power (P1dB), power gain Linearity (OIP3) Efficiency (PAE) Temperature
Power amplifier scheme
4. Amplifier
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Electronic Circuits Electronic Circuits DesignDesign
EM Wave LabEM Wave Lab13
Characteristics
5. Filter
2 port network: S parameters Pass band and stop band Return loss and insertion loss Ripple and selectivity (skirt) Pole and zero Group delay
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Electronic Circuits Electronic Circuits DesignDesign
EM Wave LabEM Wave Lab14
Classification
LPF (Low Pass Filter) HPF (High Pass Filter) BPF (Band Pass Filter) BSF (Band Stop Filter): notch filter
Duplexer: 2 BPF Diplexer: LPF and HPF
5. Filter
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Electronic Circuits Electronic Circuits DesignDesign
EM Wave LabEM Wave Lab15
Frequency conversion
Mixer VCO: Voltage Controlled Oscillator PLL: Phase Locked Loop TCXO: Temperature Compensated Crystal
Oscillator
6. Mixer
출처 : RFDH.com