Gain or input volume controller and method utilizing a modified R2R ladder network
First Claim
1. A gain controller, comprising:
- a modified R2R ladder network having a number of R2R branches wherein resistor values of the gain controller are selected to provide a desired noise minimization aspect;
switches coupled respectively to the R2R branches; and
a switch controller for respectively controlling the switches to control and provide an overall gain value for a signal.
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Abstract
A gain or input volume controller and method includes a modified R2R ladder network having a number of R2R branches, switches coupled respectively to the R2R branches, and a switch controller for respectively controlling the switches to control and provide an overall gain value for a signal. The switch controller further includes a mapper for mapping a gain control signal to the switches wherein the gain control signal respectively activates or deactivates the switches. A fine gain control stage provides a fine gain control of the overall gain value. A coarse gain control stage is coupled to the fine gain control stage. The coarse gain control stage includes the modified R2R ladder network and provides a coarse gain control of the overall gain value.
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Citations
22 Claims
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1. A gain controller, comprising:
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a modified R2R ladder network having a number of R2R branches wherein resistor values of the gain controller are selected to provide a desired noise minimization aspect;
switches coupled respectively to the R2R branches; and
a switch controller for respectively controlling the switches to control and provide an overall gain value for a signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for controlling gain of a signal by a gain controller, comprising:
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selectively controlling activation of a number of R2R branches of a modified R2R ladder to control and provide an overall gain value for a signal of the gain controller; and
selecting resistor values of the gain controller to provide a desired noise minimization aspect. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A codec for coding and decoding signals, comprising:
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a clock generator system for providing an operating clock signal for the codec;
a digital interface block having at least registers and a codec link interface for coupling to a codec controller wherein the clock generator system is coupled to the digital interface block;
a digital input/output interface block for digitally interfacing with input and output devices wherein the digital input/output interface block is coupled to the digital interface block;
an analog interface block having at least an analog-to-digital converter, an input multiplexer, an input mixer, an output mixer, a digital-to-analog converter wherein the analog interface block is coupled to the digital interface block, a volume controller coupled to an input of the digital-to-analog converter wherein the volume controller has a modified R2R ladder network having a number of R2R branches wherein resistor values of the volume controller are selected to provide a desired noise minimization aspect, switches coupled respectively to the R2R branches, and a switch controller for respectively controlling the switches to control and provide a volume gain value for a signal from the digital-to-analog converter; and
a sample rate conversion system coupled between the digital interface block and the analog interface block to convert between respective sample rates of the digital interface block and the analog interface block. - View Dependent Claims (20, 21, 22)
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Specification