Switched active bias control and power-on sequencing circuit for an amplifier
First Claim
1. An active bias control circuit for an amplifier, comprising:
- a switch responsive to a supply voltage for providing an input current to the input of the amplifier;
a current sense circuit coupled to the switch for sensing a scaled down replica of the input current to the amplifier; and
a first amplifier control circuit responsive to the current sense circuit for adjusting a first control voltage to the amplifier in response to the sensed, scaled down replica of the input current to regulate the input current to the amplifier.
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Accused Products
Abstract
An active bias control circuit for an amplifier includes a switch responsive to a supply voltage for providing an input current to the input of the amplifier, and a current sense circuit coupled to the switch for sensing a scaled down replica of the input current to the amplifier. A first amplifier control circuit is responsive to the current sense circuit for adjusting a first control voltage to the amplifier in response to the sensed, scaled down replica of the input current to regulate the input current to the amplifier. Circuitry for power up sequencing an amplifier for an active bias control circuit for the amplifier is also disclosed.
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Citations
36 Claims
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1. An active bias control circuit for an amplifier, comprising:
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a switch responsive to a supply voltage for providing an input current to the input of the amplifier; a current sense circuit coupled to the switch for sensing a scaled down replica of the input current to the amplifier; and a first amplifier control circuit responsive to the current sense circuit for adjusting a first control voltage to the amplifier in response to the sensed, scaled down replica of the input current to regulate the input current to the amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An active bias control circuit for a plurality of amplifiers, comprising:
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a plurality of bias control circuits each responsive to a supply voltage and each one corresponding to an amplifier, each control circuit including; a switch responsive to the supply voltage for providing an input current to the corresponding amplifier; a current sense circuit coupled to the switch for sensing a scaled down replica of the input current to the corresponding amplifier; and an amplifier control circuit for providing a control voltage to the corresponding amplifier and adjusting the control voltage in response to the sensed scaled down replica of the input current to regulate the input current to the corresponding amplifier.
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31. An active bias control circuit for a plurality of amplifiers, comprising:
a plurality of bias control circuits each responsive to a corresponding supply voltage and each one corresponding to an amplifier, each control circuit including; a switch responsive to the corresponding supply voltage for providing an input current to the corresponding amplifier; a current sense circuit coupled to the switch for sensing a scaled down replica of the input current to the corresponding amplifier; and an amplifier control circuit for providing a control voltage to the corresponding amplifier and adjusting the control voltage in response to the sensed scaled down replica of the input current to regulate the input current to the corresponding amplifier.
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32. An active bias control circuit for an amplifier, comprising:
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a low dropout regulator for providing a regulated voltage; a switch responsive to the low dropout regulator and providing an input current to the amplifier; a current sense circuit responsive to the low dropout regulator for sensing a scaled down replica of the input current to the amplifier; and an amplifier control circuit for providing a control voltage to the amplifier and adjusting the control voltage in response to the sensed scaled down replica of the input current to regulate the input current to the amplifier.
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33. An active bias control circuit for a plurality of amplifiers, comprising:
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a low dropout regulator for providing a regulated voltage; a plurality of bias control circuits each one corresponding to an amplifier, each control circuit including; a switch responsive to the low dropout regulator for providing an input current to the corresponding amplifier; a current sense circuit responsive to the low dropout regulator for sensing a scaled down replica of the input current to the corresponding amplifier; and an amplifier control circuit for providing a control voltage to the corresponding amplifier and adjusting the control voltage in response to the sensed scaled down replica of the input current to regulate the input current to the corresponding amplifier. - View Dependent Claims (34, 35, 36)
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Specification