Integrated circuits with on-chip AC noise suppression

Details Integrated circuits with on-chip AC noise suppression Integrated circuits with on-chip AC noise suppression

2005-02-24

2008-10-14

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C323S314000, C327S538000, C327S541000

Reexamination Certificate

active

07436243

ABSTRACT:
On-chip AC noise suppression is provided for a target circuit within an integrated circuit chip. A power supply line filter is provided in the power supply line that feeds the target circuit. The filter includes a polysilicon resistor formed over a charged substrate well, with a dielectric material interposed between the well and the resistor. This decreases capacitive coupling between the substrate and the resistor, thereby suppressing AC noise that is injected via the substrate. For an on-chip bandgap reference circuit, AC noise suppression can be achieved by providing matched AC impedances in the PTAT and inverse PTAT branches of the circuit. This technique exploits the common-mode rejection capability of the error amplifier within the bandgap reference circuit. Also, the inputs of the error amplifier can be capacitively coupled together to exploit the amplifier's common-mode rejection capability for the suppression of AC noise that is injected at the amplifier inputs.

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Dae Woon Kang et al., “A Low Power Methodology for Portable Electronics”, Department of Electrical and Computer Engineering, Northeastern University.

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