On-chip-generated supply voltage regulator with power-up mode

Details On-chip-generated supply voltage regulator with power-up mode On-chip-generated supply voltage regulator with power-up mode

1999-03-12

2000-05-09

Riley, Shawn

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

G05F 316

Patent

active

060608730

ABSTRACT:
A regulator system for an on-chip-generated supply voltage includes a voltage detection circuit, a power-up mode detection circuit, a normal mode detection path, and a power-up detection path. The voltage detection circuit monitors the on-chip-generated supply voltage and generates a signal that indicates the level of this supply voltage. The power-up mode detection circuit detects when the chip is in the power-up mode and generates a path select signal. The path select signal causes the regulator system to select the power-up detection path during the power-up mode and to select the normal detection path when not in the power-up mode. The power-up detection path includes voltage regulation circuitry that does not rely on a reference voltage. In one embodiment, the power-up detection path includes a logic gate coupled to receive the signal from the voltage detector. The logic gate is skewed to have a trip point that corresponds to voltage level slightly greater than that of the external supply voltage. The logic gate controls the on-chip voltage generator to maintain the on-chip-generated voltage level at a magnitude greater than that of the external supply voltage. During power-up, the power-up detection circuit selects the power-up detection path, thereby avoiding the need to disable the on-chip voltage generator as in conventional systems that depend on a reference voltage.

REFERENCES:
patent: 5189319 (1993-02-01), Murakami et al.
patent: 5511026 (1996-04-01), Cleveland et al.
patent: 5521547 (1996-05-01), Tsukada
patent: 5861771 (1999-01-01), Matsuda et al.

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