Patent ID: 7834657
Filing Date: 2010-11-16
Classification: H03K

Abstract:
1. A inverter circuit with compensation for threshold voltage variations, the inverter circuit comprising: a ground reference node, a primary voltage supply node, a secondary voltage supply node, an inverter circuit input node and an inverter circuit output node; a digital signal amplitude converter having an amplitude converter input, coupled to the inverter circuit input node, and an amplitude converter output, the digital signal amplitude converter being coupled to the secondary supply node and the ground reference node; a positive threshold voltage compensation generator having a positive threshold voltage compensation generator input, coupled to the amplitude converter output, and a positive threshold voltage compensation generator output, the positive threshold voltage compensation generator being coupled to the secondary supply node and the primary voltage supply node; a negative threshold voltage compensation generator having a negative threshold voltage compensation generator input, coupled to the inverter circuit input node, and a negative threshold voltage compensation generator output; a multiplexer having a first input, coupled to the positive threshold voltage compensation generator output, a second input, coupled to the negative threshold voltage compensation generator output, and a multiplexer output; and an inverter module with an output providing the inverter circuit output node, the inverter module having an inverter module input coupled to the multiplexer output and being coupled to the primary supply node and ground reference node.