Patent ID: 8717005
Filing Date: 2014-05-06
Classification: G05F

Abstract:
1. A switched capacitor voltage reference, comprising: a first capacitor coupled between a first node and a second node, a second capacitor coupled between said second node and an anode node, and a third capacitor coupled between said second node and a third node; a current source providing a bias current to said anode node; at least one first diode device, each having an anode coupled to said anode node and each having a cathode coupled to a common node; at least one second diode device, each having an anode coupled to said anode node and each having a cathode coupled to a fourth node; a first switching circuit which is configured to couple said first node to a selected one of said anode node and said common node; a second switching circuit which is configured to couple said fourth node to a selected one of a disable node and said common node; a third switching circuit which is configured to couple said third node to a selected one of an output reference node and said common node; a fourth switching circuit which is configured to selectively couple said output reference node to said second node; and an amplifier having a first terminal coupled to said common node, a second terminal coupled to said second node, and an output terminal coupled to said output reference node.