An integrated analog switch for multi-channel ADC

A new analog switch is introduced, which can be used in multi-channel ADC to ease channel selection. Because of special structure and circuit techniques being used, the proposed analog switch has extremely broad bandwidth and excellent linearity when working in passing state. Besides, it can isolate the incoming signal from the inside circuits perfectly when working at disconnecting state. The two-channel 8-bit ADC integrating the proposed analog switch [1] can sample an analog signal up to 1.5GHz with a sampling rate greater than 2GHz. The measurement results shown that the ADC achieves 0.3LSB DNL, 0.3LSB INL, 7.32 ENOB at 484 MHz input.