Abstract
The integrated clock and data recovery (CDR) circuit is a key element for broad-band optical communication systems at 40 Gbls. We report a 40-Gb/s CDR fabricated in indium-phosphide heteroJunction bipolar transistor (InP HBT) technology using a robust architecture of a phase-locked loop (PLL) with a digital early-late phase detector. The faster InP HBT technology allows the digital phase detector to operate at the full data rate of 40 Gb/s. This, in tum, reduces the circuit complexity (transistor count) and the vollage-eontrolled oscillator (YCO) requirements. The IC includes an on-chip LC VCO, on-chip clock dividers to drive an extemal demultiplexer, and low-frequency PLL control loop and on-chip Umiting amplifier buffers for the data and clock I/O. To our knowledge, this is the first demonstration of a mixed-signal IC operating at the clock rate of 40 GHz. We also describe the chip architecture and measurement results.
Original language | English (US) |
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Title of host publication | Phase-Locking in High-Performance Systems |
Subtitle of host publication | From Devices to Architectures |
Publisher | Wiley-IEEE Press |
Pages | 707-711 |
Number of pages | 5 |
ISBN (Electronic) | 9780470545492 |
ISBN (Print) | 0471447277, 9780471447276 |
DOIs | |
State | Published - Jan 1 2003 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Engineering
- General Computer Science
Keywords
- Clocks
- Integrated circuits
- Integrated optics
- Optical amplifiers
- Optical fiber communication
- Transistors
- Voltage-controlled oscillators