Bosch PPP6 B8 Series Manual de Serviço Página 195

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Oscillator
MC68HC912D60P Pierce Oscillator Specification
MC68HC912D60A — Rev. 3.1 Technical Data
Freescale Semiconductor Oscillator 195
Figure 12-4. MC68HC912D60P Pierce Oscillator Architecture
There are the following primary differences between the previous
Colpitts (‘A’) and new Pierce (‘P’) oscillator configurations:
Oscillator architecture was changed from Colpitts to Pierce.
Hysteresis was added to the clock input buffer to reduce sensitivity
to noise.
The bias current to the amplifier was optimized for less process
variation.
ALC
+
-
OTA
+
-
RFEEDBACK
EN
BIAS
Resonator
C
EX-VSS
C
X-VSS
BUF
RFLT
CFLT
GM
EXTAL XTAL
RESD
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