Method and apparatus for sampling

摘要

Aspects of the disclosure provide a sampling circuit with reduced sampling distortions. The sampling circuit can include a switch and a first driving module configured to drive a first signal in response to an input signal onto a first channel terminal of the switch. The sampling circuit also can include a bootstrap module coupled to a control terminal of the switch and a second driving module coupled to the bootstrap module. The second driving module can be configured to drive a second signal in response to the input signal to the bootstrap module, such that the bootstrap module can vary a control voltage on the control terminal based on the input signal for turning on the switch and causing an output voltage on a second channel terminal of the switch to track the first signal on the first channel terminal of the switch.

主权项

1. A sampling circuit, comprising:
a switch having a control terminal and a transistor; a first driving module configured to output a first signal to the switch in response to a received analog input signal, the first signal being substantially equivalent to the received analog input signal; and a second driving module configured to output a second signal in response to the received analog input signal such that a control voltage on the control terminal is varied based on the received analog input signal, a substantially constant voltage difference being applied between the control terminal and the second driving module, the second signal being substantially equivalent to the received analog input signal, and a first error difference between the first signal of the first driving module and the received analog input signal being smaller than a second error difference between the second signal of the second driving module and the received analog input signal, wherein the first driving module is further configured to drive the first signal substantially equivalent to the received analog input signal with a higher power than the second driving module driving the second signal.