US 2010/0164619 A1Published application

Amp output proctective circuit for lcd panel source driver

AssigneeDongbu HiTek Co., Ltd.

InventorsJong-Cheol Kim, Jong-Kee Kim

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Abstract

An AMP output protective circuit for an LCD panel source driver is disclosed. To solve a problem that internal diodes of PMOS/NMOS of an AMP output circuit are turned on, embodiments are characterized in making input and output voltages of the AMP in a charge sharing interval equal to HVDD and short-circuiting outputs of PAMP and NAMP with VRST_GH and VRST_GL lines, respectively. Accordingly, since there is no increase of voltage (Vth) attributed to a body effect, a speed is not reduced. An additional body bias control circuit is unnecessary. Power consumption can be reduced. Also, an AMP circuit can be more safely protected by adding an output reset function and an AMP protecting circuit.

Claims20

Dependent claims

An apparatus comprising:

a first amplifier biased by first and second power source voltages;
a second amplifier biased by the second power source voltage and a third power source voltage;
an input enable switching unit including switches connected between a first input line and an input terminal of the first amplifier and between a second input line and an input terminal of the second amplifiers;
an input HVDD switching unit including switches connected between the input terminal of the first amplifier and a second power line for supplying the second power source voltage and between the input terminal of the second amplifier and the second power line;
and
an output HVDD switching unit including switches connected between an output terminal of the first amplifier and the second power line and between the second power line and the output terminal of the second amplifier.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/641,050Filed 17 Dec 2009
Priority: KR 10-2008-013417926 Dec 2008
Published: 1 Jul 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H03F 1/523
Circuit arrangements for protecting such amplifiers: for amplifiers using field-effect devices
H03F 3/45475
Characterised by the way of implementation of the active amplifying circuit in the differential amplifier: using IC blocks as the active…
H03F 2200/252
Indexing scheme relating to amplifiers: multiple switches coupled in the input circuit of an amplifier are controlled by a circuit, e.g. feedback…
H03F 2200/421
Indexing scheme relating to amplifiers: multiple switches coupled in the output circuit of an amplifier are controlled by a circuit

Family

US 7,982,535 B2Related patent
US 2010/0164619 A1This patent

From the US filing history. Foreign family members aren’t listed.

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