Description du Produit
Functions : 40 Gbps 800 mVpp Differential Coder
The VWA 500023 AA chip is a NRZ differential coder for high data rate application typically 10 to 28 (tbc) Gb/s. The chip is designed in 0.18μm SiGe BiCMOS 150 GHz process.
The device has two high frequency differential inputs (NRZ_in and Clock) and one differential high frequency output (DIff_Out). The chip is 50Ω single ended and 100Ω differential in and out. The chip can be used single in and out.
The input data stream is synchronized by the clock and electrically coded to a differential format. If a logical zero is present to the input the output remains unchanged: Qn+1=Qn. If a logical one is present to the data input the output value is changed at every rising edge of the clock: a constant one to the input gives a continuous series of 01010 to the output.
The different parts of the chip are internally biased using a voltage and currents reference circuit (Bandgap); in order to have the overall RF
characteristics of the chip insensitive to the voltage supply the temperature and the process spread. An enable input control pin is used to switch the chip ON or OFF.
Three separate pins are used to bias the chip: one dedicated to the reference circuit the second for the coder core (input buffers and coder core) and the last for the 50Ω output driver. The 3 bias inputs can be separately filtered / decoupled in order to optimize the overall chip performances.
- SiGe BiCMOS – Ft = 150GHz
- Data rate up to 28Gb/s
- 3 V / 480 mW typical bias @ 27°C
- Single or differential input / output
- Input amplitude (data and clock): 300mV pp
- Output amplitude: 800mV pp diff (400mV on each 50Ω output)
- Temperature compensated
- ON and OFF state through an enable pin control
- NRZ to RZ DPSK data coding
- Fiber transmission