CSBFB900KJ58-R1 Murata, CSBFB900KJ58-R1 Datasheet - Page 15

• Manufacturer Part Number: CSBFB900KJ58-R1
• Manufacturer: Murata

Specifications of CSBFB900KJ58-R1

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Generally, basic oscillation circuits can be grouped into
the following 3 categories.
q Use of positive feedback
w Use of negative resistance element
e Use of delay in transfer time or phase
In the case of ceramic resonators, quarts crystal
oscillators, and LC oscillators, positive feedback is the
circuit of choice.
Among the positive feedback oscillation circuit using an
LC, the tuning type anti-coupling oscillation circuit,
Colpitts and Hartley circuits are typically used.
See Fig. 2-6.
In Fig. 2-6, a transistor, which is the most basic
amplifier, is used.
The oscillation frequencies are approximately the same
as the resonance frequency of the circuit consisting of L,
C
and L
represented by the following formulas. (Refer to Note 3
on page 15.)
In an LC network, the inductor is replaced by a ceramic
resonator, taking advantage of the fact that the
resonator becomes inductive between resonant and anti-
resonant frequencies.
This is most commonly used in the Colpitts circuit.
The operating principle of these oscillation circuits can
be seen in Fig. 2-7. Oscillation occurs when the
following conditions are satisfied.
In Colpitts circuit, an inverter of
it is inverted more than
feedback circuit. The operation with a ceramic resonator
can be considered the same.
(Colpitts Circuit)
fosc. =
(Hartley Circuit)
fosc. =
2. Basic Oscillation Circuits
L1
and C
Loop Gain G =
Phase Amount
2
in the Hartley circuit. These frequencies can be
2
2
L2
C (L
in the Colpitts circuit or consisting of L
L · C
1
=
C
1
1
+L
L1
L1
1
+ C
· C
2
)
+
·
L2
L2
U1
2
= 360 n (n = 1, 2, ···)
2
= 180 with L and C in the
1
= 180 is used, and
1
(2-4)
(2-5)
(2-6)
Fig. 2-6 Basic Configuration of LC Oscillation Circuit
Colpitts Circuit
Principles of CERALOCK
C
L1
Fig. 2-7 Principle of Oscillation
L
C
L2
Amplifier
Feedback Circuit
Mu Factor :
Phase Shift :
Feedback Ratio :
Phase Shift :
Hartley Circuit
1
2
Oscillation Conditions
Loop Gain G=
Phase Shift =
L
1
C
·
L
1
2
+
U1
2
=360 n
®
2
13
P17E.pdf
08.3.28
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