11

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2

2

(Note 3)

Fig.Ⅲ shows the equivalent circuit of an emitter

grounding type transistor circuit. In the figure, Ri

impedance and ß stands for current amplification

rate.

When the oscillation circuit in Fig.2-6 is expressed

by using the equivalent circuit in Fig.Ⅲ, it becomes

for each Hartley type and Colpitts type circuit.

The following 3 formulas are obtained based on

Fig.Ⅳ.

oscillation, the following conditional formula can be

performed by solving the formulas of (1), (2) and (3)

on the current.

the following conditional formula is obtained by

dividing the formula (4) into the real number part

and the imaginary number part.

(Imaginary number part)

(Real number part)

Formula (5) represents the phase condition and

formula (6) represents the power condition.

Oscillation frequency can be obtained by applying

the elements shown in the aforementioned table to

                ………… (7)

                ………… (8)

In either circuit, the term in brackets will be 1 as

oscillation frequency can be obtained by the

following formula.

                  …… (9)

                  … (10)

-

+

1

R

Notes

1

23

1

R

-

+

Z

Hartley Type

Z

1 / jωC

Colpitts Type

jωL

(Hartley Type)

1

}

(Colpitts Type)

· {

1+

1

}

L

fosc. =

(Hartley Type)

1

fosc. =

(Colpitts Type)

1

…………………………… (3)

P17E.pdf

2012.10.31