Patent ID: 8378717

Claim:
A high-speed BiCMOS double sampling track-and-hold amplifier circuit, comprising: an input buffer, including an input end and an output end; two front-end switches, each including a forward toggle and a backward toggle, wherein an end of the forward toggle is coupled to the output end of the input buffer, and the other end of the forward toggle is coupled to an end of the backward toggle; two sampling capacitors, wherein an end of the sampling capacitor is coupled to the junction of the forward toggle in the front-end switch and the backward toggle in the front-end switch, while the other of the sampling capacitor is coupled to ground; two intermediate buffers, each including an input end and an output end, wherein the input end of the intermediate buffer is coupled to the junction of the sampling capacitor and the front-end switch; two feedback buffers, each including an input end and an output end, wherein the input end of the feedback buffer is coupled to the output end of the intermediate buffer and the output end of the feedback buffer is coupled to the other end of the backward toggle in the front-end switch; two back-end switches, each including a forward toggle and backward toggle, wherein an end of the forward toggle and an end of the backward toggle are conjunctively coupled to the junction of the intermediate buffer and the feedback buffer; and an output buffer, including an input end and an output end, wherein the input end is coupled to the other end of the forward toggle in the two back-end switches.