Circuit devices and methods of providing a regulated power supply
First Claim
1. A circuit comprising:
- a regulated power supply terminal;
a processing circuit coupled to the regulated power supply terminal;
a low frequency responsive circuit including a first transistor adapted to be coupled to a power source and including first circuitry configured to control current flow from the power source through the first transistor to supply a low frequency current to the regulated power supply terminal; and
a high frequency responsive circuit including a second transistor coupled to the regulated power supply terminal and including second circuitry configured to control the second transistor to selectively modulate high frequency current components at the regulated power supply terminal to reduce voltage variations on the regulated power supply terminal.
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Accused Products
Abstract
In an embodiment, a circuit includes a regulated power supply terminal, a processing circuit coupled to the regulated power supply terminal, and a low frequency responsive circuit having a first transistor adapted to be coupled to a power source and having first circuitry configured to control current flow from the power source through the first transistor to supply a low frequency current to the regulated power supply terminal. The circuit device further includes a high frequency responsive circuit having a second transistor coupled to the regulated power supply terminal and having second circuitry configured to control the second transistor to selectively modulate high frequency current components at the regulated power supply terminal to reduce voltage variations on the regulated power supply.
25 Citations
20 Claims
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1. A circuit comprising:
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a regulated power supply terminal; a processing circuit coupled to the regulated power supply terminal; a low frequency responsive circuit including a first transistor adapted to be coupled to a power source and including first circuitry configured to control current flow from the power source through the first transistor to supply a low frequency current to the regulated power supply terminal; and a high frequency responsive circuit including a second transistor coupled to the regulated power supply terminal and including second circuitry configured to control the second transistor to selectively modulate high frequency current components at the regulated power supply terminal to reduce voltage variations on the regulated power supply terminal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of providing a regulated power supply, the method comprising:
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controlling the regulated power supply provided to a regulated power supply terminal using a low frequency responsive circuit to produce a supply voltage; comparing variations of the supply voltage to a threshold to produce a control signal; modulating the supply voltage at the regulated power supply terminal by selectively sinking high frequency current components to ground in response to the control signal using a high frequency responsive circuit to reduce variations in the supply voltage; and powering a processing circuit from the regulated power supply terminal. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A circuit comprising:
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a series regulator circuit adapted to be coupled to a power supply and configurable to provide a regulated power supply voltage to a regulated power supply terminal based on the power supply;
the series regulator circuit comprising;an amplifier circuit including a first input coupled to a reference voltage, a second input coupled to one of a feedback signal and a regulated power supply, and an output; a transistor coupled between the power supply and the regulated power supply terminal and including a gate coupled to the output of the amplifier; and a shunt regulator circuit coupled to the regulated power supply terminal and to ground, the shunt regulator circuit configurable to shunt high frequency components of the regulated power supply voltage to ground. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification