Battery polarity insensitive integrated circuit amplifier
First Claim
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1. A Class D amplifier circuit powered by a voltage source, comprising:
- a pulse width modulation control drive circuit for providing voltage multiplied in-phase and inverted pulse width modulated signals, said drive circuit including a pulse trimming apparatus which generates said in-phase and inverted pulse width modulated signals; and
a plurality of transistors arranged in an H-bridge configuration, each of said transistors having a gate;
wherein the gates of the transistors of the H-bridge are interconnected such that they act in response to said in-phase signal and said inverted pulse width modulated signal to produce amplified pulse width modulated signals.
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Abstract
A battery polarity insensitive amplifier utilizes a power management architecture to reduce the size of the circuitry used to accomplish the polarity correction function. An efficient Class D amplifier and compact voltage multiplying driver circuit reduce the size of the battery polarity insensitive amplifier circuit.
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Citations
29 Claims
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1. A Class D amplifier circuit powered by a voltage source, comprising:
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a pulse width modulation control drive circuit for providing voltage multiplied in-phase and inverted pulse width modulated signals, said drive circuit including a pulse trimming apparatus which generates said in-phase and inverted pulse width modulated signals; and a plurality of transistors arranged in an H-bridge configuration, each of said transistors having a gate; wherein the gates of the transistors of the H-bridge are interconnected such that they act in response to said in-phase signal and said inverted pulse width modulated signal to produce amplified pulse width modulated signals. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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2. A Class D amplifier circuit powered by a voltage source, comprising:
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a control drive circuit for providing voltage multiplied in-phase and inverted pulse width modulated signals, said control drive circuit reduces the width of said in-phase and phase-inverted pulse width modulated signals relative to each other such that there is substantially no temporal overlap between the in-phase and inverted pulse width amplified signals; and a plurality of n-channel transistors arranged in an H-bridge configuration, each of said transistors having a gate; wherein the gates of said transistors are interconnected such that they act in response to said in-phase signal and said inverted pulse width modulated signal to produce amplified pulse width modulated signals. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 22)
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10. An integrated circuit Class D amplifier powered by a miniature battery of either polarity, comprising:
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a constant polarity voltage source comprising a voltage polarity correction circuit powered by said battery and producing a constant polarity output voltage across two terminals, a polarity control circuit acting in response to battery inputs and reference signals from at least one of the terminals of said polarity corrected voltage source to produce control signals and at least one polarity adjustable voltage source powered by said battery, said polarity adjustable voltage source acting in response to control signals from said polarity control circuit to produce an adjusted polarity voltage output; a pulse width modulation circuit for producing pulse width modulated pulses from input audio signals, said pulse width modulation circuit powered by said constant polarity voltage source; a control drive circuit for providing voltage multiplied in-phase and inverted pulse width modulated signals, said drive circuit comprising transient voltage multipliers to increase the voltage of pulse width modulated signals to at least twice the source voltage, said pulse width modulated control drive circuit powered by said constant polarity voltage source; four n-channel MOSFET transistor switches having a gate node, said switches powered by said battery and arranged in an H-bridge configuration; wherein the gate nodes of the transistors of the H-bridge are interconnected such that they act in response to said in-phase signal and said inverted pulse width modulated signal to produce amplified pulse width modulated signals. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification