US 7,459,953 B1Granted

Voltage adjusting circuit

AssigneeIli Technology Corp.

InventorsMeng-Yong Lin, Bo-Chang Wu, Ming-Huang Liu, Chi-Mo Huang

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Abstract

The present invention discloses a voltage adjusting circuit including a first switch element, a second switch element, a third switch element, a fourth switch element, a fifth switch element, and a sixth switch element. At first, the voltage adjusting circuit performs a discharging operation on an output voltage toward a reference voltage source, and then when the output voltage level is approaching a voltage level of an input voltage source, the voltage adjusting circuit will perform the discharging operation on the output voltage toward the input voltage source instead, and thus the voltage adjusting circuit can avoid affecting the input voltage source when performing the discharging operation. In addition, the voltage adjusting circuit does not need a digital counter to perform the above dual-phase type discharging operation or multi-phase type discharging operation, and therefore cost of the voltage adjusting circuit is lower, and the voltage adjusting circuit has good accuracy.

Claims10

Dependent claims

A voltage adjusting circuit, comprising:

a first switch element, having a control terminal coupled to a first control signal, a first terminal coupled to a first voltage source, and a second terminal coupled to a first node;
a second switch element, having a control terminal coupled to a second control signal, a first terminal coupled to a second node, and a second terminal coupled to the first node, wherein the second node is an output terminal of the voltage adjusting circuit, for outputting an output voltage according to the first voltage source;
a third switch element, having a control terminal coupled to the first node, a first terminal coupled to the second node, and a second terminal coupled to a third node;
a fourth switch element, having a control terminal coupled to a third control signal, a first terminal coupled to a second voltage source, and a second terminal coupled to the third node;
a fifth switch element, having a control terminal coupled to the second control signal, a first terminal coupled to the second node, and a second terminal coupled to the third node;
and
a sixth switch element, having a control terminal coupled to the third node, a first terminal coupled to the second node, and a second terminal coupled to the first voltage source.

4 more elements

Dependencies are inferred from the claim text.