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Vertical ramp generating circuit

A technology for generating circuits and ramp waves, which is applied in pulse generation, television, electrical components, etc., and can solve problems such as deterioration of interlaced scanning characteristics

Inactive Publication Date: 2002-07-31
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the offset voltage ΔV exceeds the allowable value, the interlace characteristic deteriorates

Method used

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  • Vertical ramp generating circuit

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Embodiment Construction

[0018] Next, embodiments of the present invention will be described with reference to the drawings. figure 1 A vertical ramp wave generating circuit according to an embodiment of the present invention is shown. in addition, figure 2 Shows figure 1 The timing chart of the operation of the shown vertical ramp wave generation circuit. in addition, image 3 A vertical deflection drive circuit receiving the output of the vertical ramp wave generation circuit according to the embodiment of the present invention is shown.

[0019] figure 1 Among them, 10 is a constant current source for supplying a constant current I1 to the capacitor 11 for ramp wave generation. 12 is a PNP type transistor for voltage fixing, the emitter is connected to the terminal 17 of the capacitor 11, and the collector is connected to the ground point GND. In addition, the output OUT of the ramp wave is taken out from the terminal 17 of the capacitor 11 .

[0020] 13 is a voltage source for supplying...

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Abstract

A vertical ramp wave generating circuit that can accurately decide timing of start of a ramp so as to surely improve the interlace characteristic even when an external disturbance of an fh component is exerted to the circuit at the point of the ramp start. The vertical ramp wave generating circuit is provided with a ramp wave generating capacitor 11, a constant current source 10 that supplies a constant current to the ramp wave generating capacitor 11, a voltage fixing means that discharges the ramp wave generating capacitor 11 and fixes a terminal of the capacitor 11 forcibly to a prescribed reference voltage Vref, and a counter circuit 15 that can output a control signal with a pulse width in response to a desired wait time, and the fixing means fixes a terminal voltage 17 of the ramp wave generating capacitor 11 to the reference voltage for a wait time set by the count circuit 15.

Description

technical field [0001] Field of the Invention The present invention relates to a ramp wave generating circuit for vertical scanning in television receivers or various monitoring devices (hereinafter referred to as television receivers, etc.), and more particularly to a vertical ramp wave generating circuit with improved interlaced scanning characteristics. Background technique [0002] Figure 5 shows the existing vertical ramp wave generation circuit. The constant current source 1 supplies a constant current I1 to the capacitor 3, and when the switch SW1 is closed, the constant current source 2 flows a discharge current I2 from the capacitor 3 to the ground point GND. Basically, a ramp voltage is generated at the terminal 9 of the capacitor 3 by switching the switch SW1 on and off. Here, the circuit configuration for turning on and off the switch SW1 is as follows. [0003] The terminal voltage of the capacitor 3 is supplied to the inverting input terminal (-) of the diffe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N3/16H02M1/08H03K4/50H03K4/502
CPCH03K4/50H03K4/502H04N3/16
Inventor 中岛宪一
Owner SANYO ELECTRIC CO LTD