8-7
2. DEFLECTION CIRCUIT
2-1. The oscillation and deflection control integrated circuit
The oscillation and the deflection circuit is generated by IC501. IC501 has digital signal processor (DSP)
and generates variety of correction signals by calculations. The feature of IC501 are low tolerance and low
drift of temperature compared with current analog circuit. The functions of IC501 are Horizontal oscillation,
Vertical oscillation, Horizontal position control, Distortion correction, Dynamic focus control, Moire canceler,
and Convergence correction. These correction signals generated by DSP are converted to analog signal by
the D/A converter, and these signals are output from IC output terminal.
1) Digital Signal Processor (DSP)
The digital signal processor generates variety of correction signals by calculations based on MPU (IC801)
data. The DSP generate saw wave by MPU data. The signal, after the AGC in this saw wave, is moved to
the reference signal. This reference signal generates various correction signals. All the signal wave shape
formation inside DSP are done by the operation. The output signals from DSP are converted to analog
signal by the D/A converter, and then these signals are output from IC output terminal.
MPU
DSP
DATA
Reference
signal
AGC
Vertical saw wave
Distortion correction wave
Moire cancel wave
Dynamic focus wave
Convergence correction wave
D/A
converter
IC501
V.sync
(Fig. 2.1) Digital Signal Processor (DSP)
2) 1bit D/A converter (1bit DAC)
Most of the signals which are generated by DSP are output from 1 bit D/A converter. The 1bit D/A
converter is pulse width modulation (PWM) circuit which is operated with 25MHz internal clock signal. The
3.3Vp-p signal which is modulated by pulse width is output from the 1bit D/A converter output terminal.
This signal is integrated by integration circuit which is composed of resistor and capacitor and creates
vertical periodic wave. The vertical dynamic focus control, distortion correction, convergence correction
and moire canceler signals are output from the 1bit D/A converter.
1bit D/A OUTPUT
Integration circuit
Operated by 25MHz clock.
3.3Vp-p
(
Fig. 2.2) 1bit D/A converter
Содержание MultiSync FP1370
Страница 13: ...4 4 REMARK SYMBOL Mount the EMF PWB 121E REMARK SYMBOL Clamp the connector ...
Страница 14: ...4 5 REMARK SYMBOL COIL FORMING UPPER SIDE REMARK SYMBOL COIL FORMING LOWER SIDE ...
Страница 23: ...4 14 REMARK SYMBOL REMARK SYMBOL Clamp CN CA CN CC and CN D with CLAMPER WIRE ...
Страница 26: ...4 17 REMARK SYMBOL Clamp the wires SAFETY REMARK SYMBOL Clamp the wires CN ASD CN AF 21 ...
Страница 80: ...5 51 Fig 3 11 CONV PWB Fig 3 12 EMF PWB CN EMF CN LL CN RR CNEM CN CA CN D CN CCB HS8N1 ...
Страница 143: ...8 18 15V 80V AFC D FOCUS Fig 3 1 HIGH VOLTAGE CIRCUIT AND PROTECTOR CIRCUIT ...
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