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This paper describes a CMOS serial link allowing fully duplexed 1 Gbaud serial data communication. The bidirectional serial link comprises a transmitter, a bidirectional bridge, an impedance matching circuit, a 4 GHz data oversampler, and a digital PLL. Fully duplexed serial data communication is realized by the bidirectional bridge and process- independent clock and data recovery is accomplished by the digital PLL. A single channel serial link and a charge pump PLL are integrated in a chip. The chip is fabricated using 1.2 pm CMOS process technology. INTRODUCTION Today, data rates become higher on various data communication fields. A high speed bidirectional serial link is a robust, low-cost solution to the high data rate requirements of chip-to-chip, board-to-board, and system- to-system communication. The bidirectional serial link can be applied to processor-to-processor communications, graphics super computers, and I-IDTV, which require the highest data rate, and also to various I/O channels, LANs, satellite, fiber data communications. This paper proposes a CMOS bidirectional serial link allowing fully duplexed data transfers at 1 Gbaud. |
