Patent ID: 8742782

Claim:
An on-chip system for noncontact electrical testing of a test structure on a chip, comprising: on-chip photodiodes configured to receive pump light from a pump light source, the on-chip photodiodes being individually electrically connected to a plurality of test circuits on the test structure on the chip and being configured to generate power for the plurality of test circuits on the test structure; an on-chip coupling unit configured to receive probe light from a probe light source, the on-chip coupling unit being optically connected to on-chip waveguides through which the probe light is transferred; and corresponding ones of on-chip switches configured to open in response to respectively receiving separate voltage outputs from the plurality of test circuits on the test structure, the corresponding ones of the on-chip switches remaining closed respectively when the separate voltage outputs are not received from the plurality of test circuits on the test structure; wherein the corresponding ones of the on-chip switches are configured to pass the probe light when respectively opened by the separate voltage outputs from the plurality of test circuits on the test structure; wherein the corresponding ones of the on-chip switches are configured to block the probe light by remaining closed, when the separate voltage outputs are not respectively received from the plurality of test circuits on the test structure; wherein the plurality of test circuits are respectively electrically connected to the corresponding ones of the on-chip switches; wherein the corresponding ones of the on-chip switches are respectively optically connected to corresponding ones of the on-chip waveguides; wherein the corresponding ones of the on-chip switches are configured to pass the probe light for the plurality of test circuits that provide the separate voltage outputs to the corresponding ones of the on-chip switches, in order to cause a signal collection unit to capture an image of the probe light for the plurality of test circuits that provide the separate voltage outputs.