Track and hold with dual pump circuit

A track and hold circuit for sampling an input signal, comprising:

• at least one sampling capacitor;
• at least one dual pump sampling circuit, each comprising:
• a transmission gate including a p-channel transistor and an n-channel transistor, each transistor having a control terminal and a pair of current terminals coupled between the input signal and a pump output;
• and
• a dual charge pump including first and second pump circuits, each having an input coupled to receive the input signal, an output coupled to a control terminal of a corresponding one of the p-channel and n-channel transistors, and an activation input, and each configured to linearize operation of a corresponding one of the transmission gate transistors;
• and
• a sample control circuit coupled to activation inputs of each of the at least one dual pump sampling circuit and to each sampling capacitor, the sample control circuit operative to set common-mode voltage on each sampling capacitor, to activate the dual pump sampling circuit to sample the input signal via each sampling capacitor, and then to deactivate each dual pump sampling circuit to provide a sampled output signal.

A track and hold circuit, comprising:

• an differential amplifier having a differential input and a differential output;
• a common mode input circuit coupled to the differential input of the differential amplifier;
• a common mode output circuit coupled to the differential output of the differential amplifier;
• a first sampling capacitor having a first end coupled to a first input polarity of the differential amplifier and a second end;
• a second sampling capacitor having a first end coupled to a second input polarity of the differential amplifier and a second end;
• a first feedback resistive device coupled between the second end of the first sampling capacitor and a first output polarity of the differential amplifier;
• a second feedback resistive device coupled between the second end of the second sampling capacitor and a second output polarity of the differential amplifier;
• a pair of dual pump circuits, each dual pump circuit having an input for sampling a corresponding polarity of a differential input signal and an output coupled to a second input of a corresponding one of the first and second sampling capacitors, each comprising:
• a transmission gate including a p-channel device and an n-channel device, the p-channel device having a control terminal and a pair of current terminals coupled between a corresponding polarity of the differential input signal and the second input of the corresponding sampling capacitor and the n-channel device having a control terminal and a pair of current terminals coupled between a corresponding polarity of the differential input signal and the second input of the corresponding sampling capacitor;
• an n-channel pump circuit having an input coupled to the corresponding polarity of the differential input signal and an output coupled to the control terminal of the n-channel device;
• and
• a p-channel pump circuit having an input coupled to the corresponding polarity of the differential input signal and an output coupled to the control terminal of the p-channel device.