Bandwidth extension and noise cancelling for TIAs : wwo new common source TIA implementations

This thesis discusses two implementations for high-bandwidth low-noise transimpedance amplifiers. These techniques are designed for a common source TIA without using inductors in standard CMOS. The two techniques proposed in this thesis are: noise cancelling and bandwidth extension. The noise cancelling technique uses the fact that at some point inside the feedback resistance a virtual ground for the input current is located, while at this node a part of the noise of the TIA is present. This node is used to cancel the noise of the TIA. The second technique, the bandwidth extension, uses a controlled current source to increase the TIA bandwidth. This controlled current source both increases the loop gain without decreasing the transimpedance gain and decreasing the noise up to the TIA bandwidth