TCXO_KKC课件.ppt

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TCXO_KKC课件

The TCXO;? A temperature characteristic is most significant factor to influence frequency stability of crystal. ? TCXO is the solution to realize flat stable frequency oscillation by built-in temperature compensated circuit. ? TCXO is applicable for basic signal source of electronics appliances and communication equipments since it can create stable frequency output.;A crystal temperature is compensated by thermistor, cap, resistor, and transistor.;1. Analog TCXO;A compensated voltage curve of linear function connection (trapezoid compensation)type is shown in bellow. Its basic circuit construction is the same as 3rd function. However, there is specific feature in temperature compensated circuit. 1st: Devied temperature range (-30 deg ~ + 80degC) into 5 areas 2nd: Calculate approximate linear function in each areas 3rd: Connect 5 areas f(x)= Ax+B――― * X: Temperature However, actual crystal temperature characteristic shows 3rd function. The difference between 3rd function and approximate linear function will appear in TCXO TC characteristic.;What is “3rd function compensation”?;? Frequency temperature characteristic Frequency stability after adjusted by built-in temperature compensated circuit.;Output wave form at estimated load condition “10pF//10Kohm” (C-MOS gate impedance) Right output wave form is called as “ gripped sign carve”.;Oscillating frequency is confirmed in various supply voltage, estimating customers actual dispersion of circuit voltage. TCXO can supply stable oscillating frequency since its IC has regulator function. Electric current consumption: Current consumption of TCXO activated in circuit Output level: Output wave amplitude of TCXO activated in circuit;? Start up time (Frequency) Measure start up time to required frequency in turning on supply voltage.;? Phase noise(位相ノイズ) Every clock source including TCXO shall generate unnecessary energy ”phase noise” around output oscillating

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