[무선통신]PLL 잡음특성

소개글

PLL 회로의 잡음특성에 대하여 알아본다.
먼저 잡음원을 알아보고 각 블럭별 잡음원에 대해 알아본다
그리고 각 블럭별 잡음을 알아보고 수식관계도 알아본다.

목차

1. What is the Noise Source?

2. PLL Block Noise Source

3. VCO / DIVIDER / REFERENCE OSCILLATOR Noise

4. Filter Noise

본문내용

1. What is the Noise Source?
▩ Noise source
- When current passes non-homogeneity material such as carbon
composition(consist of carbon and semiconductor) resistor

▩ Noise Kinds
1. White Noise
: Noise power is in whole frequency

2. Pink Noise
: Noise power is comparison in reciprocal of frequency (1/f)
Get the white noise flow the LPF which bandwidth cut is -3dB/octave)

3. Thermal Noise
: It occurs by exercise by heat of free electron in resistor
Power of heat noises is fixed per unit bandwidth(=White Noise)

Pn = KTB(W) Pn : Max Power
K : Boltzmann constant (1.38 * 10-23)
T : Absolute temperature
B : Measurement Bandwidth(Hz)

참고 자료

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