Low-power offset-cancellation switched-capacitor correlated double sampling bandgap reference


A coffee-power offset-cancellation switched capacitor bandgap reference for a tyre pressure monitor system is proposed. It employs a correlated double sampling switched-capacitor amplifier with opamp offset voltage cancellation while not requiring the output to slew to ground each time the amplifier is reset. Additionally the circuit topology is terribly insensitive to low opamp gain and allows a simple single-stage opamp structure. This structure also has clock feedthrough cancellation and is very suitable for low-power application attributable to its small slew rate and low opamp gain demand. Moreover, coarse and fine process calibration techniques are applied to minimise the method deviation. Simulation results are provided to verify the effectiveness of the topology.

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