Digital to analog converter (DAC) circuit with extended operation range
AssigneeAnalog Devices, Inc.
InventorDennis A. Dempsey
Life of this patent
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Abstract
A DAC circuit is described which includes a DAC coupled to an amplifier. The circuit is configured to dynamically change the operating range of the amplifier depending on the circuit operating requirements. In this way the DAC circuit may be operable in one of a plurality of available ranges so as to have an extended range of operation.
Claims35
A digital to analog converter (DAC) circuit including a DAC coupled at its output to an amplifier, the circuit additionally including control circuitry digitally coupled to the input to the DAC and providing an analog output to the amplifier, the control circuitry being configured to modify a supply voltage to the amplifier based on the input to the DAC, so as to change an amplifier power supply in correspondence with changes at the DAC, and wherein the control circuitry is responsive to abuse events to effect a modification of the amplifier supply voltage.
A circuit including an amplifier, the amplifier being operable to provide an output in a first defined voltage range, the circuit being configured to operate in a second defined voltage range, the second defined voltage range being larger than the first defined voltage range, and wherein the circuit includes control circuitry coupled to an output stage of the amplifier and being configured to effect a movement of the first defined voltage range to overlap with different regions of the second defined voltage range.
A circuit including a DAC coupled to an amplifier, the DAC providing an output coupled to the input to the amplifier, the amplifier having a first voltage range of operation and wherein an output stage of the amplifier is coupled to control circuitry which is configured to modify the amplifier power supply so as to vary the range of the amplifier from the first voltage range of operation to a second voltage range of operation.
A digital to analog converter (DAC) circuit including a DAC coupled at its output to an amplifier, the circuit additionally including control circuitry digitally coupled to the input to the DAC and providing an analog output to the amplifier, the control circuitry being configured to modify a supply voltage to the amplifier based on the input to the DAC, so as to change an amplifier power supply in correspondence with changes at the DAC, the control circuitry including a first and second DAC buffer, the first and second DAC buffer controlling positive and negative supply voltages to the amplifier respectively.
Dependencies are inferred from the claim text.