Topic
Voltage regulator
About: Voltage regulator is a research topic. Over the lifetime, 33536 publications have been published within this topic receiving 350859 citations.
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01 Oct 1997
TL;DR: In this paper, a charge pump shunt regulator only utilizes regular low voltage NMOS and PMOS from a standard CMOS process, and a reference voltage scheme is used in which a regular low-voltage PMOS is used as a mirror diode (reference PMOS) to precisely realize a control voltage for the shunting NMOS without violating any breakdown mechanism, i.e. PMOS gated diode breakdown and P+ to n-well junction breakdown.
Abstract: MOS charge pump generation and regulation method and apparatus of the general type used in a non-volatile memory chip for generating high voltages (˜20 v). This invention utilizes a current controlled oscillator to generate the clock for the charge pump voltage multiplier. The oscillator frequency is designed to compensate for process, temperature and power supply variations. The charge pump shunt regulator only utilizes regular low voltage NMOS and PMOS from a standard CMOS process. A reference voltage scheme is used in which a regular low voltage PMOS is used as a mirror diode (reference PMOS) to precisely realize a control voltage for the shunting NMOS without violating any breakdown mechanism, i.e. PMOS gated diode breakdown and P+ to n-well junction breakdown. A medium voltage level is also used to buffer the shunting NMOS transistors from gated diode breakdown. A native NMOS cascode current mirror is used to precisely mirror the current to achieve minimum headroom voltage with minimum circuit area.
65 citations
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16 Feb 1994TL;DR: In this article, a 2.0 V differential voltage reference for a 10.24 MHz oversampled data converter is presented, which maintains high PSR and accuracy while consuming 2.2 mW.
Abstract: The performance of many mixed analog/digital systems is limited by inaccuracies and power supply noise coupling errors in integrated voltage references. Reference circuitry also typically contributes a large fraction of the analog power consumption. The CMOS bandgap circuit described here provides a 2.0 V differential voltage reference for a 10.24 MHz oversampled data converter, and maintains high PSR and accuracy while consuming 2.2 mW. >
65 citations
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15 Sep 1993TL;DR: In this article, an IC memory card used in a dual power supply voltage operation system and having a backup function is arranged to prevent destruction of data stored in an internal memory caused by an erroneous access in a non-operation-ensured voltage range between lower and higher operation-enriched voltage ranges.
Abstract: An IC memory card used in a dual power supply voltage operation system and having a backup function is arranged to prevent destruction of data stored in an internal memory caused by an erroneous access in a non-operation-ensured voltage range between lower and higher operation-ensured voltage ranges Three voltage levels divided from an external power supply voltage by voltage dividing resistors are compared with a reference voltage from a reference voltage generation circuit to determine whether the external power supply voltage is at the lower or upper limit of the lower operation-ensured voltage range or the lower limit of the higher operation-ensured voltage range On the basis of outputs from these comparators, a memory protection signal generation circuit generates a memory protection signal to enable the memory to be protected even in the voltage range between the lower and higher operation-ensured voltage ranges
65 citations
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NEC1
TL;DR: In this paper, a constant voltage circuit consisting of MOS transistors is provided, which comprises a reference voltage generator and an error amplifier performing the temperature compensation of the reference voltage outputted from the generator.
Abstract: A constant voltage circuit formed of MOS transistors is provided, which comprises a reference voltage generator and an error amplifier performing the temperature compensation of a reference voltage outputted from the reference voltage generator and outputting a constant voltage. The reference voltage generator comprises first, second and third MOS transistors each driven by a constant current source, and outputs the reference voltage to the connecting end with the error amplifier. The error amplifier includes a differential pair of fourth and fifth MOS transistors whose capacity ratio is 1:K1, and an active load composed of sixth and seventh transistors whose capacity ratio is 1:K2. One of input pair of the differential pair is applied with the reference voltage and the other thereof is applied with a voltage obtained by dividing the constant voltage. The output voltage of the differential pair is outputted to the outside as the constant voltage from an output circuit including resistors for dividing the constant voltage.
65 citations
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12 Aug 2010TL;DR: In this article, an external ramp and an internal ramp are used to stabilize a switching voltage regulator employing V2 control against ripple oscillation instability when the equivalent series resistance (ESR) of an output capacitor is small.
Abstract: Stabilization of a switching voltage regulator employing V2 control against ripple oscillation instability when the equivalent series resistance (ESR) of an output capacitor is small is provided by providing both an external ramp and an internal ramp (only the latter of which requires an approximation of inductor current) in the control feedback path, preferably including both inner and outer feedback loops. Approximation of inductor current using such an arrangement is non-critical and may be estimated based on power input voltage. Drift of a circuit providing such an inductor current estimation is preferably avoided by adjusting control duty cycle or slew rate of the positive-going ramp portion of the estimated inductor current triangular waveform.
65 citations