Bandwidth enhancement for transimpedance amplifiers
Bandwidth enhancement for transimpedance amplifiers
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DOI：
10.1109/jssc.2004.831783
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发表时间：
2004-08-01
影响因子：
5.4
通讯作者：
Hajimiri, A
中科院分区：
文献类型：
--
作者：
Analui, B;Hajimiri, A
提出了一种提高给定放大器带宽的技术。通过增加多个级间无源匹配网络，可以控制传递函数和频率响应行为。级联增益级的寄生电容相互隔离，并吸收到无源网络中。介绍了一种利用众所周知的低通滤波器元件值进行简化设计的方法。为了验证该方法的可行性，采用0.18微米BiCMOS工艺实现了一个跨阻抗放大器(TIA)。在光电二极管电容为0.5-pF的情况下，实现了9.2 GHz的3分贝带宽。这相当于在没有附加无源网络的情况下，放大器的带宽增强率为2.4。其跨阻增益为54 dBOmega，而2.5伏电源的电流为55 mA。对于误码率为10(-12)的情况，TIA的输入灵敏度为-18 dBm。
A technique for bandwidth enhancement of a given amplifier is presented. Adding several interstage passive matching networks enables the control of transfer function-and frequency response behavior. Parasitic capacitances of cascaded gain stages are isolated from each other and absorbed into passive networks. A simplified design procedure, using well-known low-pass filter component values, is introduced. To demonstrate the feasibility of the method, a CMOS transimpedance amplifier (TIA) is implemented in a 0.18-mum BiCMOS technology. It achieves 3 dB bandwidth of 9.2 GHz in the presence of a 0.5-pF photodiode capacitance. This corresponds to a bandwidth enhancement ratio of 2.4 over the amplifier without the additional passive networks. The trans-resistance gain is 54 dBOmega, while drawing 55 mA from a 2.5-V supply. The input sensitivity of the TIA is -18 dBm for a bit error rate of 10(-12).