CX5032GA10000H0QSWZZ KSS [Kyocera Kinseki Corpotation], CX5032GA10000H0QSWZZ Datasheet - Page 25

• Manufacturer Part Number: CX5032GA10000H0QSWZZ
• Description: Crystal Units Surface Mount Type
• Manufacturer: KSS [Kyocera Kinseki Corpotation]

(7) Transistor third overtone oscillation circuit
Select each circuit constant so that the adjustment ranges of upper and lower frequencies of this circuit are even on the
basis of the frequency of a single crystal unit measured using a specified load capacity, and that the margin of ±8 to 10 10
of the room temperature deviation of the crystal unit can be reserved.
To prevent the decrease in the negative resistance, always connect the crystal unit to the base of the transistor. For
transistors used for oscillation circuits, hfe and fT are important.
To obtain the large negative resistance with small current consumption, select a transistor for high frequency amplification
with hfe of over 250 and f
①The resonance circuit comprised of
②Use
oscillation. Set the resonance frequency to a value higher than the intermediate between fundamental wave frequency and
third overtone frequency.
self-excited oscillation by
resistance in the overtone oscillation frequency band, there are no other effective means of obtaining adequate oscillation
margin except for preventing the increase of load resonance resistance R
L
1
, referred to as an elongation coil, to connect the load capacitance of the oscillation circuit in series.
Handling Notes
T
of 1GHz or more.
L
1
. Since it is difficult in general to design the oscillation circuit having adequate negative
C
L
1
2
and
C
C
t
3
is required on the emitter side for preventing fundamental mode crystal
R
R
1
2
- 58 -
C
C
2
3
R
Vcc
3
L
C
of the crystal unit.
5
C
0.01
4
OUT
R
1
prevents
-6