HIGH SPEED, HIGH DENSITY POLYIMIDE SPACE TRANSFORMER WITH GHz BANDWIDTH
Original Publication Date: 1987-Jun-01
Included in the Prior Art Database: 2005-Feb-01
There is a need for a high speed space transformer with fast risetimes and high density (10-mil center-to-center) spacing. Two different types of space transformers are known, the first being a hybrid coax (HYCO) space transformer and the second being a multilayer ceramic (MLC) space transformer. The fabrication of the HYCO is extremely labor intensive with very little chance of being automated. On the other hand, the fabrication of the MLC space transformer is highly integrated; however, it is fairly expensive and has a long development and lead time. Both of these space transformers contact the chip under test (CUT) using an interposer which is placed between the chip and the space transformer. The pins on the interposer are unshielded and have high inductance.