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# Introduction to Electronic Circuit

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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.

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### Introduction to Electronic Circuit

1. 1. Electronic Circuit Design CHO, Yong Heui Introduction to Electronic Circuit
2. 2. 1. Diode Nonlinear device No voltage drop External circuits
3. 3. i D = 0, v D ≤ V D0 i D = (v D - V D0 ) / r D , v D ≥ V D0 Piecewise linear model 1. Diode
4. 4. Device structure 2. BJT Mode EBJ CBJ Cutoff Reverse Reverse Active Forward Reverse Rev. Act. Reverse Forward Saturation Forward Forward
5. 5. i C = I S e VBE/VT ·(1+v CE /V A ) I-V characteristics 2. BJT ∂ i C ∂ v CE r o ≡ v BE =constant -1
6. 6. <ul><li>OP amp 의 어떤 terminal 도 ground 에 연결되어 있지 않음 . </li></ul><ul><li>3 signal terminals and 2 power terminals (Not displayed) </li></ul><ul><li>D ifferential input voltage, single-ended output voltage </li></ul><ul><li>Infinite input impedance i i = 0 </li></ul><ul><li>Zero output impedance </li></ul><ul><li>Zero common-mode gain (v2=v1  vo=0) </li></ul><ul><li>Infinite open-loop gain A </li></ul><ul><li>Infinite bandwidth : A is constant at any frequencies. </li></ul>*Differential input voltage, single-ended output voltage Ideal OP Amp 3. OP amp Ideal OP amp
7. 7. Selection of active device 4. Amplifier pHEMT amplifier with package <ul><li>Gain [dB] </li></ul><ul><li>Bandwidth [Hz] </li></ul><ul><li>Stability: oscillation </li></ul><ul><li>Noise figure [dB]: LNA </li></ul><ul><li>P1dB [dBm]: PA </li></ul><ul><li>Characteristics of active device: bias </li></ul> Bare chip
8. 8. Bias design <ul><li>Assignment of AC and DC path </li></ul> 4. Amplifier
9. 9. LNA (Low Noise Amplifier) <ul><li>Noise figure: 2 dB </li></ul><ul><li>Amplifier gain: 15 dB </li></ul><ul><li>Return loss: 15 dB </li></ul><ul><li>Reverse isolation: 20 dB </li></ul><ul><li>Impedance matching: power and noise </li></ul> 4. Amplifier
10. 10. <ul><li>SNR: signal to noise ratio </li></ul><ul><li>Noiseless system: NF = 1 </li></ul><ul><li>Noisy system: NF > 1 </li></ul><ul><li>Ground </li></ul> Noise figure (NF) 4. Amplifier
11. 11. Simulation of LNA HP ADS (Advanced Design System)  <ul><li>AC and DC path </li></ul> 4. Amplifier
12. 12. HPA (High Power Amplifier) <ul><li>Output power (P1dB), power gain </li></ul><ul><li>Linearity (OIP3) </li></ul><ul><li>Efficiency (PAE) </li></ul><ul><li>Temperature </li></ul> Power amplifier scheme 4. Amplifier
13. 13. Characteristics 5. Filter <ul><li>2 port network: S parameters </li></ul><ul><li>Pass band and stop band </li></ul><ul><li>Return loss and insertion loss </li></ul><ul><li>Ripple and selectivity (skirt) </li></ul><ul><li>Pole and zero </li></ul><ul><li>Group delay </li></ul>
14. 14. Classification <ul><li>LPF (Low Pass Filter) </li></ul><ul><li>HPF (High Pass Filter) </li></ul><ul><li>BPF (Band Pass Filter) </li></ul><ul><li>BSF (Band Stop Filter): notch filter </li></ul><ul><li>Duplexer: 2 BPF </li></ul><ul><li>Diplexer: LPF and HPF </li></ul> 5. Filter
15. 15. Frequency conversion  <ul><li>Mixer </li></ul><ul><li>VCO: Voltage Controlled Oscillator </li></ul><ul><li>PLL: Phase Locked Loop </li></ul><ul><li>TCXO: Temperature Compensated Crystal Oscillator </li></ul>6. Mixer 출처 : RFDH.com