| Patent application number | Description | Published |
|---|
| 20100164463 | VOLTAGE GENERATOR WITH CURRENT LIMITING AND SEMICONDUCTOR TESTING DEVICE - A voltage generator with current limiting generates a voltage to be fed to a load of which load current is limited. The voltage generator includes an operational amplifier; an output resistance connected between an output terminal of the operational amplifier and a load connecting terminal; a feedback resistor connected between the load connecting terminal and an inverting input terminal of the operational amplifier; a first clamper connected between the output terminal of the operational amplifier and the inverting input terminal of the operational amplifier; and a second clamper connected between the load connecting terminal and a non-inverting input terminal of the operational amplifier and configured with diodes. The first clamper generates a predetermined constant voltage, limits a current flowing into the output resistance, and varies the generated constant voltage. The first clamper has a predetermined abrupt current-voltage characteristic. | 07-01-2010 |
| 20100194404 | POWER SOURCE STABILIZATION CIRCUIT, ELECTRONIC DEVICE AND TESTING APPARATUS - A power source stabilization circuit provided within a chip of an electronic device is provided. The power source stabilization circuit stabilizes a power source voltage supplied to an operational circuit of the electronic device. The power source stabilization circuit includes an amplifier that detects a fluctuation component in the power source voltage occurring in a main power source wiring used to supply the power source voltage to the operational circuit, amplifies the detected fluctuation component, and outputs the amplified fluctuation component, and a stabilization capacitor that is provided between an output end of the amplifier and the main power source wiring and supplies to the main power source wiring a current to reduce fluctuation in the power source voltage occurring in the main power source wiring, in accordance with the output from the amplifier. | 08-05-2010 |
| 20110074497 | POWER SUPPLY STABILIZING CIRCUIT, ELECTRONIC DEVICE AND TEST APPARATUS - A test apparatus that tests a device under test, comprising a signal input section that supplies a test signal to a device under test and a judging section that judges acceptability of the device under test based on a response signal output by the device under test in response to the test signal. The signal input section includes an operation circuit that operates to generate the test signal and a power supply stabilizing circuit provided in the same chip to stabilize power supply voltage supplied to the operation circuit. The power supply stabilizing circuit includes a high-speed compensating section compensating for a change in the power supply voltage supplied to the operation circuit, at a predetermined compensation speed, and a low-speed compensating section compensating for the change in the power supply voltage supplied to the operation circuit, at a predetermined compensation speed lower than that of the high-speed compensating section. | 03-31-2011 |
| 20110163771 | TEST APPARATUS AND DRIVER CIRCUIT - A test apparatus includes: a driver circuit that supplies, to a device under test, a test signal corresponding to an input signal; and a judging section that judges pass/fail of the device under test, based on the load voltage or the load current supplied to the device under test when supplying a test signal of a constant current or a constant voltage to the device under test from the driver circuit, where the driver circuit includes: a driver section that outputs the test signal; a supply current detecting section that detects a supply current supplied to the driver section; and an output control section that controls a voltage or a current of the test signal outputted from the driver section to the predetermined value, based on the supply current detected by the supply current detecting section. | 07-07-2011 |
