Wideband operational amplifier having a plurality of feedback loops
First Claim
1. An amplifier comprising:
- an input coupled to an input stage;
an output coupled to an output stage;
an output error correction stage coupled to an output of said input stage;
an output of the output error correction stage being coupled to an input of said output stage;
said output error correction stage including a first high open loop gain amplifier including a transistor comprising an active amplifying component;
a first negative feedback path coupled to an output of the output stage and an input of said first high open loop gain amplifier;
a second negative feedback path coupled between the output and input of said first high open loop gain amplifier;
said second negative feedback path including at least one capacitor;
said second negative feedback path forming a first local dominant pole;
an output of said input stage being coupled to an input of said high open loop gain amplifier; and
a power supply having an input coupled to said output stage and an output coupled to said active amplifying component;
wherebythe power supply output voltage substantially follows the output voltage of said output stage.
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Accused Products
Abstract
An amplifier having error correction and including an output stage containing output transistors being connected to the amplifier output, and an output error correction stage containing a first high open loop gain amplifier which includes one or more transistors being the first high open loop gain amplifier transistor or transistors, an output of which is connected to an input of the output stage, the amplifier including at least two local negative feedback paths, a first local negative feedback path being between an output of the output stage and an input of the first high open loop gain amplifier and a second local negative feedback path being between an output of the first high open loop gain amplifier and an input of the first high open loop gain amplifier.
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Citations
14 Claims
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1. An amplifier comprising:
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an input coupled to an input stage; an output coupled to an output stage; an output error correction stage coupled to an output of said input stage; an output of the output error correction stage being coupled to an input of said output stage; said output error correction stage including a first high open loop gain amplifier including a transistor comprising an active amplifying component; a first negative feedback path coupled to an output of the output stage and an input of said first high open loop gain amplifier; a second negative feedback path coupled between the output and input of said first high open loop gain amplifier; said second negative feedback path including at least one capacitor; said second negative feedback path forming a first local dominant pole; an output of said input stage being coupled to an input of said high open loop gain amplifier; and a power supply having an input coupled to said output stage and an output coupled to said active amplifying component;
wherebythe power supply output voltage substantially follows the output voltage of said output stage. - View Dependent Claims (2, 3, 4, 5)
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- 6. A low distortion electronic amplifier having an input for receiving a signal to be amplified, an output, and an output stage including an output transistor, an output of the output stage for providing the amplifier output, an output error correction stage including a first high open loop gain amplifier and an output connected to an input of the output stage, at least two negative feedback paths, a first negative feedback path including a forward transfer function of the output transistor coupled between an output of the output stage and an input of the first high open loop gain amplifier and a second negative feedback path coupled between an output of the first high open loop gain amplifier and an input of the first high open loop gain amplifier and including a first capacitor in series with the second negative feedback path, wherein the said second negative feedback path forms a first local dominant pole, the output error correction stage including a second high open loop gain amplifier having an output connected to an input of the first high open loop gain amplifier, a third local negative feedback path coupled between an output of the output stage and an input of the second high open loop gain amplifier and a fourth local negative feedback path coupled between an output of the second high open loop gain amplifier, an input of the second high open loop gain amplifier and the fourth negative feedback path including a second capacitor, wherein said fourth negative feedback path forms a second local dominant pole, and an input stage to which an input signal is applied, an output of the input stage being applied to an input of the second high open loop gain amplifier, and the first high open loop gain amplifier being supplied by floating power rails, wherein said floating power rails are adapted to substantially track the output signal.
Specification