Patent ID: 8330513

Claim:
A voltage hold circuit, comprising: an operational amplifier, including: a positive input end; a negative input end; and an output end coupled to the negative input end; a first switch, including: a first end; a second end coupled to the positive input end of the operational amplifier; and a control end for receiving a first control signal; a second switch, including: a first end coupled to the first end of the first switch; a second end coupled to the negative input end of the operational amplifier; and a control end for receiving a second control signal; a third switch, including: a first end coupled to the output end of the operational amplifier; a second end; and a control end for receiving the first control signal; a fourth switch, including: a first end coupled to the positive input end of the operational amplifier; a second end coupled to the second end of the third switch; and a control end for receiving the second control signal; and a capacitor, including: a first end coupled to the second end of the fourth switch; and a second end coupled to a ground end.