| 摘要 |
<p>Increase by a factor of at least 75 percent standby mode autonomy for data systems on portable equipment fitted with LCD screens. Eliminates exterior capacity effects on the intermediate levels of the voltage divider which allows integration of the latter, a reduction of the number of input/outputs and a reduction in the size of the chip. The analogue control stable voltage low power consumption generator (VSEGO) comprises: (a) an input circuit (1), receiving a set analogue voltage (Vlcd), which produces an analogue image voltage (Vjp) reduced by a set factor k; (b) a control circuit (2) which receives the voltage (Vjp), as a setting level value, and an image signal (Si), which is formed by the analogue control voltage (VSEGO) reduced by the same k relationship. The control circuit includes an differential amplifier (20) fed, from a constant set voltage (V21) whose amplitude is greater than the maximum value of the image voltage, and from a second set constant voltage (V22). The amplifier delivers a first switching control pulse (VOUTPLUSP) synchronized with the level signal and lower amplitude of the first constant voltage and a second switching control pulse (VOUTMOINSP) synchronized with the level signal but additional to the first control pulse; (c) a switching circuit (3) fed from the set nominal analogue control voltage, the switching circuit includes a first branch (SW1), controlled by the pulse (VOUTPLUSP), formed by an invertor/amplifier, which delivers an auxiliary switching pulse (V-HI-OUT) synchronized with the level signal, and a similar second branch (SW2), controlled by the pulse (V-HI-OUT) and by the second pulse (VOUTMOINSP), which delivers a switched voltage of nominal et value</p> |
