Feedforward-type parasitic capacitance canceler and its application to 4 Gb/s T/H circuit

This paper proposes a novel parasitic capacitance cancellation method. Since parasitics are canceled by feedforwarding signals, a circuit using the proposed cancellation method is always stable unlike a conventional method using a negative impedance converter. This cancellation method is applicable to a balanced-type circuit driving capacitors with source followers. As an example it is applied to implementation of a high-speed track-and-hold circuit (T/H circuit). Thanks to this method implementation of a 4-Gbit/s T/H circuit with 6-bit accuracy is confirmed through HSPICE simulations with 90-nm CMOS process under 0.9-V power supply voltage.