Abstract:
In order to meet the demand of high speed, low jitter and low skew system clocks for advanced electronic systems, a high speed clock driver with two outputs is proposed in this paper. The proposed clock driver is mainly composed of modules such as bandgap reference, input buffer, output amplifier and so on. The active feedback skill are adopted to increase gain and expand bandwidth in the input buffer. The output amplifier introduces the method of zero compensation pole by the capacitor peaking skill, which significantly expands the bandwidth of the output amplifier. This high speed clock driver is realized in 0.18 μm SiGe BiCMOS process. The test results show that the maximum operating frequency of this design is not less than 8 GHz under the condition of power voltage between 3.0 V and 3.6 V, operating temperature between −55 ℃ and 125 ℃. In addition, the random additive jitter is 21.16 fs @ 622.88 MHz when integrated from 12 kHz to 20 MHz. The skew between two outputs is less than 10 ps. This clock driver can provide two high speed and high stability clock outputs for at the same time. It has been popularly used in various advanced electronic systems such as communication systems, high performance computing, electronic warfare and so on.