Bi-directional buffer for interfacing test system channel
First Claim
1. A probe card comprising:
- an emitter follower transistor having a base for connecting to a DUT, an emitter connected to a test channel for connecting to a test system controller that transmit test signals to the DUT, and a collector; and
a bypass resistor connecting the base to the emitter of the emitter follower transistor so that test signals can be provided from the DUT to the test system controller.
2 Assignments
0 Petitions
Accused Products
Abstract
An emitter follower or source follower transistor is provided in the channel of a wafer test system between a DUT and a test system controller to enable a low power DUT to drive a test system channel. A bypass resistor is included between the base and emitter of the emitter follower transistor to enable bi-directional signals to be provided between the DUT channel and test system controller, as well as to enable parametric tests to be performed. The emitter follower transistor and bypass resistor can be provided on the probe card, with a pull down termination circuit included in the test system controller. The test system controller can provide compensation for the base to emitter voltage drop of the emitter follower transistor.
-
Citations
17 Claims
-
1. A probe card comprising:
-
an emitter follower transistor having a base for connecting to a DUT, an emitter connected to a test channel for connecting to a test system controller that transmit test signals to the DUT, and a collector; and a bypass resistor connecting the base to the emitter of the emitter follower transistor so that test signals can be provided from the DUT to the test system controller. - View Dependent Claims (2, 3, 4)
-
-
5. A probe card comprising;
-
a source follower transistor having a gate for connecting to a DUT, a source connected to a channel for connecting to a test system controller that transmits test signals to the DUT, and a drain; and a bypass resistor connecting the gate to the source of the source follower transistor so that test signals can be provided from the DUT to the test system controller.
-
-
6. An apparatus comprising:
-
a voltage follower transistor having a first gate or base terminal for connecting to a DUT, a second terminal for connecting through a channel of a test system to a test system controller that transmits test signals to the DUT, and a third terminal; and a bypass resistor connecting the first terminal to the second terminal of the voltage follower transistor so that test signals can be provided from the DUT to the test system controller. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
Specification