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Ended output type D-class amplifier of double-feedback differential circuit

A class D amplifier, differential amplifier technology, applied in differential amplifiers, amplifiers, DC-coupled DC amplifiers, etc., can solve problems such as limited open-loop gain, eliminate nonlinear components, and improve total harmonic distortion plus noise ratio. Effect

Active Publication Date: 2011-01-12
EUTECH MICROELECTRONICS
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0013] The above-mentioned class D amplifier 70a includes a first-order feedback circuit 71, which can reduce the nonlinear terms (non- linear terms) to be eliminated, however, the above-mentioned first-order feedback loop is only synthesized by a single signal amplifier and then amplified, so the overall open-loop gain is quite limited

Method used

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  • Ended output type D-class amplifier of double-feedback differential circuit
  • Ended output type D-class amplifier of double-feedback differential circuit
  • Ended output type D-class amplifier of double-feedback differential circuit

Examples

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Embodiment Construction

[0033] see figure 1As shown, it is a circuit block diagram of a preferred example embodiment of the single-ended output type D amplifier 10 of the double feedback differential loop of the present invention, which includes a gain adjustment circuit 11, a second-order integrator, two comparators 30, 31, A logic circuit 40, a half-bridge circuit 50 and an inverter 24, wherein the half-bridge circuit 50 includes a high-side switch group 51 and a low-side switch group 52 connected in series with two phases, and the series node is a class D A single output terminal (Do) of the amplifier; in addition, the single-ended output terminal (Do) of the single-ended output type D amplifier is connected to the inverter 24 to provide a set of differential output signal terminals (Do+, D0-). Wherein the second-order integrator includes:

[0034] A first differential amplifier 20 includes a positive input terminal (+), an inverting input terminal (-), a reverse differential output terminal (-)...

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Abstract

The invention discloses an ended output type D-class amplifier of a double-feedback differential circuit, comprising a gain amplifier, a second-order noise filtering circuit, two comparators, a logic circuit, two half bridge circuits and an inverter, wherein two groups of half bridge circuits are matched with the inverter to manufacture differential signals with complementary phases; then, the second-order noise filtering circuit is matched to form a double-feedback differential circuit by a forward and backward output signal with the amplifier and the gain amplifier so as to eliminate the noise of output signals; and finally, a better SDNR value is provided.

Description

technical field [0001] The invention relates to a single-end input type D amplifier, in particular to a single-end output type D amplifier with double feedback differential loops. Background technique [0002] Generally speaking, the amplifier circuit of the output stage includes amplifiers of Class A, Class B, Class AB, and Class D. In the early days, Class AB amplifiers were more common, but with the maturity of semiconductor processing technology, those with lower power consumption Class D amplifiers are becoming more common. [0003] The biggest difference between a class D amplifier and a class AB amplifier is that the output pulse width modulation signal drives the inductive load instead of a linear signal; the pulse width modulation signal includes sound signals, pulse width modulation switching signals and harmonics Signal. Since the Class D amplifier outputs a pulse width modulation signal, each switch of the output stage switching circuit switches from high imped...

Claims

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Application Information

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IPC IPC(8): H03F3/217H03F3/45
Inventor 赵尧主
Owner EUTECH MICROELECTRONICS
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