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US 10,135,406 B2Granted
On-chip resistor divider compensation with a 2VRMS input
AssigneeAvnera Corporation
InventorsAli Hadiashar, Wai Laing Lee
Life of this patent
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Abstract
A new compensation system for an audio input reduces noise by matching feedback ratios in the positive and negative paths. A variable resistance network allows for fine control of resistance trimming in one of the signal paths, which allows for compensation between tolerance of resistors that are external to an integrated circuit and those that are internal to the integrated circuit.
Claims13
A system, comprising:
- an audio preamplifier having:
- a ground sense input;
- a signal input for receiving an analog audio input signal;
- an operational amplifier having an inverting input and a non-inverting output;
- a first resistance coupled between the ground sense input and the inverting input of the operational amplifier;
- a second resistance coupled between the inverting input of the operational amplifier and the non-inverting output of the operational amplifier;
- and
- a controllable compensation circuit for varying a resistance ratio between the first resistance and the second resistance;
- an Analog to Digital Converter (ADC) configured to receive an analog output signal from the audio preamplifier and convert the analog output signal to a digital output signal;
- a Digital Signal Processor (DSP) configured to receive the digital output signal from the ADC and perform at least one of the following on the digital output signal:
- noise reduction, equalization, and balance;
- a Digital to Analog Converter (DAC) configured to receive a digital output signal from the DSP and convert the digital output signal to an analog output signal;
- and
- a PWM processor configured to receive the analog output signal from the DAC and provide an amplified output audio signal to at least one speaker.
11 more elements
Dependencies are inferred from the claim text.