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US 7,030,699 B2Granted
Amplifier
AssigneeWolfson Microelectronics plc
InventorsPatrick E. Richard, John L. Pennock
Life of this patent
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AssigneeWolfson Microelectronics plc
InventorsPatrick E. Richard, John L. Pennock
Estimating the term…
An amplifier is disclosed, having an input stage connected to an output stage. The input stage is connected between a positive supply rail and a ground rail and has an input terminal arranged to receive an input signal. The output stage is connected between a positive supply rail and a negative supply rail and has an output terminal. The output stage is adapted to generate an output signal, which is dependent on a received input signal, at the output, and is further adapted such that, in use, a quiescent voltage at the output terminal is at a selected value between a voltage on the positive supply rail and a voltage on the negative supply rail. For driving a grounded load, the quiescent output voltage is preferably zero volts. In preferred embodiments, the input and output stages are formed on a common substrate using CMOS technology, the output stage including one or more NMOS devices having a triple-well structure. A corresponding method of driving a grounded load is also disclosed.
An amplifier comprising an input stage connected to an output stage, the input stage being connected between a positive supply rail and a ground rail and having an input terminal arranged to receive an input signal, the output stage being connected between a positive supply rail and a negative supply rail and having an output terminal, the output stage being adapted to generate an output signal, dependent on a received input signal, at said output, and being further adapted such that, in use, a quiescent voltage at said output terminal is at a selected value between a voltage on the positive supply rail and a voltage on the negative supply rail, wherein the input and output stages are integrated on a common substrate, and wherein the common substrate is connected to the ground rail.
An amplifier comprising an input stage connected to an output stage, the input stage being connected between a positive supply rail and a ground rail and having an input terminal arranged to receive an input signal, the output stage being connected between a positive supply rail and a negative supply rail and having an output terminal, the output stage being adapted to generate an output signal, dependent on a received input signal, at said output, and being further adapted such that, in use, a quiescent voltage at said output terminal is at a selected value between a voltage on the positive supply rail and a voltage on the negative supply rail, wherein the input and output stages are connected to a common positive supply rail and the amplifier further comprises a generating circuit arranged to generate a negative supply voltage from a positive supply voltage, the generating circuit being connected to the same positive supply rail as the output stage, and the negative supply rail being connected to an output of the generating circuit, and wherein the input and output stages are integrated on a common substrate, the common substrate being connected to the ground rail.
A method of driving a load connected to ground, the method comprising the steps of:
Dependencies are inferred from the claim text.