Circuit arrangement for voltage regulation
First Claim
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1. A circuit arrangement for voltage regulation comprising:
- an input connection for supplying a supply voltage;
an output connection for tapping off an output voltage;
an output stage comprising a control input and a controlled path having a first and a second load connection, the first load connection being coupled to the input connection, and the second load connection being connected to the output connection and being coupled to a reference potential connection via an electrical load;
a reference generator, which provides the reference potential at its output;
a comparator, which comprises a first input connected to the reference generator a second input coupled to the output connection for regulating the output voltage; and
an auxiliary regulator for limiting the voltage drop across the output stage, comprising a control element that couples the input connection to the controlled path of the output stage at a circuit node and comprising a further comparator having a nominal value input, which is coupled to the control input of the output stage, and having an actual value input, which is coupled to the circuit node.
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Abstract
The invention specifies a circuit arrangement for voltage regulation in which, in addition to a control loop having a comparator (4), an output stage (3) and a feedback path, an auxiliary regulator (11–14) is provided which limits the voltage drop across the output stage (3) and, for this purpose, comprises a control element (11) and a further comparator (13). Hence, the output stage (3) of the voltage regulator may advantageously have a withstand voltage which is lower than the supply voltage which can be supplied at the input (1). On account of its good supply voltage suppression, the voltage regulator described is particularly well suited to supplying on-chip VCOs.
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Citations
19 Claims
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1. A circuit arrangement for voltage regulation comprising:
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an input connection for supplying a supply voltage; an output connection for tapping off an output voltage; an output stage comprising a control input and a controlled path having a first and a second load connection, the first load connection being coupled to the input connection, and the second load connection being connected to the output connection and being coupled to a reference potential connection via an electrical load; a reference generator, which provides the reference potential at its output; a comparator, which comprises a first input connected to the reference generator a second input coupled to the output connection for regulating the output voltage; and an auxiliary regulator for limiting the voltage drop across the output stage, comprising a control element that couples the input connection to the controlled path of the output stage at a circuit node and comprising a further comparator having a nominal value input, which is coupled to the control input of the output stage, and having an actual value input, which is coupled to the circuit node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A circuit arrangement for voltage regulation comprising:
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an output stage that generates a regulated output voltage; a control component coupled to the output stage that at least partially controls generation of the regulated output voltage; a bandgap reference generator coupled to the control component that provides a bandgap voltage; and an auxiliary regulator coupled to the output stage that limits a voltage drop across the output stage, wherein the auxiliary regulator comprises a regulator control component coupled to the output stage that at least partially controls generation of the regulated output voltage, and wherein the regulator control component further comprises a fixed voltage source coupled to the regulator control component and the output stage, thus limiting a voltage drop across the output stage.
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12. A circuit arrangement for voltage regulation comprising:
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an output transistor having a gate connection, a source connection, and a drain connection, wherein the source connection provides a regulated output voltage; a first differential amplifier having an inverting input, a non-inverting input, and an output, wherein the output is connected to the gate connection of the output transistor; a bandgap reference generator having a first terminal connected to the non-inverting input of the differential amplifier and a second terminal, wherein a bandgap voltage is supplied to the second terminal; a voltage divider circuit having a first terminal, a second terminal, and a third terminal, wherein the second terminal generates a fraction of a voltage supplied at the first terminal, wherein the third terminal is connected to the second terminal of the bandgap reference generator, wherein the second terminal is connected to the inverting input of the first differential amplifier; and
wherein the first terminal is connected to the source connection of the output transistor;a regulating transistor having a gate connection, a source connection, and a drain connection, wherein the source connection receives a supply voltage and wherein the drain connection is connected to a drain connection of the output transistor; a second differential amplifier having an inverting input, a non-inverting input, and an output, wherein the output is connected to the gate connection of the regulating transistor and wherein the non-inverting input is connected to the drain connection of the regulating transistor; and a fixed value voltage source having an output terminal and an input terminal and provides an output voltage on the output terminal that is a fixed value above an input voltage on the input terminal, wherein the input terminal is connected to a gate of the output transistor and the output terminal is connected to the inverting input of the second differential amplifier. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification