Voltage regulator with adjustable output impedance
First Claim
1. A voltage regulator comprising:
- an output terminal operably connected to provide an output voltage to a load,an output capacitor connected to the output terminal, the output capacitor having an equivalent series resistance,a converter circuit having supply voltage terminals for the application of a supply voltage, an output coupled to the output terminal, a feedback signal input coupled to receive a feedback signal that is representative of the output voltage, a reference signal input coupled to receive a reference signal, and a control input operable to receive a control signal,wherein the converter unit is configured to provide an output current having a mean value that is proportional to a difference between the reference signal and the feedback signal, the proportionality between the difference and the output current mean value being adjustable dependent upon the control signal.
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Accused Products
Abstract
The invention relates to a voltage regulator having an output terminal (AK) for the provision of an output voltage and connection of a load, an output capacitor (20) connected to the output terminal and having an equivalent series resistance (ESR), a converter unit (10) having supply voltage terminals for the application of a supply voltage (Vcc), an output coupled to the output terminal (AK), a feedback signal input for feeding in a feedback signal (Vfb) dependent on the output voltage, a reference signal input for feeding in a reference signal (Vref), and a comparator unit (TA3), which provides a differential signal (Iea) from the reference signal (Vref) and the feedback signal (Vfb), in which case the converter unit (10) provides an output current (Iout), the mean value of which is proportional to the differential signal (Iea), the proportionality factor between this difference and the output current (Iout) being set by means of a control signal at a control input of the converter unit (10) in such a way that it is proportional to the reciprocal of the equivalent series resistance (ESR) of the output capacitor.
18 Citations
20 Claims
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1. A voltage regulator comprising:
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an output terminal operably connected to provide an output voltage to a load, an output capacitor connected to the output terminal, the output capacitor having an equivalent series resistance, a converter circuit having supply voltage terminals for the application of a supply voltage, an output coupled to the output terminal, a feedback signal input coupled to receive a feedback signal that is representative of the output voltage, a reference signal input coupled to receive a reference signal, and a control input operable to receive a control signal, wherein the converter unit is configured to provide an output current having a mean value that is proportional to a difference between the reference signal and the feedback signal, the proportionality between the difference and the output current mean value being adjustable dependent upon the control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A voltage regulator comprising:
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an output terminal operably connected to provide an output voltage to a load, an output capacitor connected to the output terminal, the output capacitor having an equivalent series resistance (ESR), a converter circuit having supply voltage terminals for the application of a supply voltage, an output coupled to the output terminal, a feedback signal input coupled to receive a feedback signal that is representative of the output voltage, a reference signal input coupled to receive a reference signal, a comparator unit configured to generate a differential signal from the reference signal and the feedback signal, the comparator including a control input operable to receive a control signal, the comparator having a gain factor dependent on the control signal, a switching converter having an inductance and a switching unit providing clocked connection of the inductance to the supply voltage in accordance with a pulse-width-modulated signal, a pulse width modulator configured to generate the pulse-width-modulated signal responsive to a regulation signal, the regulation signal being dependent on the differential signal.
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17. A method comprising:
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providing a converter circuit having supply voltage terminals for the application of a supply voltage, an output coupled to an output terminal, a feedback signal input coupled to receive a feedback signal that is representative of the output voltage, a reference signal input coupled to receive a reference signal, and a control input operable to receive a control signal, providing an output capacitor connected to the output terminal, the output capacitor having an equivalent series resistance, employing the converter unit to generate an output current having a mean value that is proportional to a difference between the reference signal and the feedback signal, and adjusting the proportionality between the difference and the output current mean value dependent upon the control signal. - View Dependent Claims (18, 19, 20)
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Specification