Patent number 8552788 is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "Embodiments of the invention relate to electronic devices, and more particularly, to level shifters.
"An amplifier, such as an operational amplifier or an instrumentation amplifier, can include an adaptive level shifter. For example, the adaptive level shifter can be used to shift a common-mode voltage of a differential input signal received by the amplifier to a common-mode voltage level more suitable for amplifying the input signal.
"Including an adaptive level shifter in an amplifier can improve the performance of the amplifier. For example, the adaptive level shifter can have an input voltage operating range that is greater than an input voltage operating range of an amplification block of the amplifier, and thus including the adaptive level shifter can help prevent the input voltage operating range of the amplification block from limiting the overall input voltage operating range of the amplifier.
"There is a need for adaptive level shifters having improved performance. Additionally, there is need for adaptive level shifters having large input voltage operating range, high common-mode rejection, low power consumption, and low noise."
In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventor's summary information for this patent: "In one embodiment, an apparatus includes a level shifter having a first input, a second input, a first output, and a second output, the first and second inputs configured to receive a differential input voltage signal and the first and second outputs configured to provide a differential output voltage signal. The level shifter includes a plurality of capacitors including a first capacitor and a second capacitor and a plurality of switches electrically coupled to the plurality of capacitors. The level shifter is configured to control the electrical connectivity of the plurality of capacitors via the plurality of switches over at least a first phase, a second phase, a third phase, and a fourth phase. The level shifter further includes a charger block configured to charge the first and second capacitors during at least a portion of the third and fourth phases to a shift voltage about equal to a difference in voltage between a common mode voltage level of the differential input voltage signal and a reference voltage. The plurality of switches are configured to electrically connect the first capacitor between the first input and first output during the first phase and between the second input and the second output during the second phase. The plurality of switches are further configured to electrically connect the second capacitor between the second input and second output during the first phase and between the first input and the first output during the second phase.
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