Multiple string digital to analog converter comprising a control circuit
First Claim
1. A multistage digital to analog converter, DAC, comprising an output node and a plurality of DAC stages, at least one of the DAC stages comprising a string comprising a plurality of impedance elements coupled to a switching network comprising switches configured to provide at least one state change at the output node in response to a sensed change across the switching network, the DAC further comprising a control circuit coupled to the switching network and configured to provide code dependent compensation for, or control of, variances in the response of the switching network.
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Accused Products
Abstract
A multi-string DAC is described and comprises at least two DAC stages. Each DAC stage comprises a string of impedance elements and a switching network. A control loop is provided to control the Ron of the switching network and provide code dependent control of switches in a DAC switching network.
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Citations
28 Claims
- 1. A multistage digital to analog converter, DAC, comprising an output node and a plurality of DAC stages, at least one of the DAC stages comprising a string comprising a plurality of impedance elements coupled to a switching network comprising switches configured to provide at least one state change at the output node in response to a sensed change across the switching network, the DAC further comprising a control circuit coupled to the switching network and configured to provide code dependent compensation for, or control of, variances in the response of the switching network.
- 20. A multistage digital to analog converter, DAC, comprising a plurality of DAC stages coupled via a switching network, the switching network comprising at least one MOS device, and further comprising switches configured to provide at least one state change in response to a sensed change across the switching network, the DAC further comprising a control circuit coupled to a gate terminal of the at least one MOS device and configured to vary voltages applied to the gate to provide compensation for, or control of, variances in the response of the switching network.
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28. A method of converting a digital input signal to a corresponding analog output, the method comprising
Providing a digital bit stream to a digital to analog converter, DAC, the DAC comprising a plurality of DAC stages, at least one of the DAC stages comprising a string comprising a plurality of impedance elements coupled to a switching network, Sensing a state change across the switching network, and Providing a control circuit coupled to the switching network and Detecting variances in the response of the switching network and in response to detection of said variances using the control circuit to provide code dependent compensation for, or control of, said variances.
Specification