LEVEL SHIFTER AND METHOD OF CALIBRATION
First Claim
Patent Images
1. A circuit comprising:
- a first input terminal adapted to receive a first capacitor having a first capacitance;
a second input terminal adapted to receive a second capacitor having a second capacitance;
a terminal voltage source;
a third capacitor coupled between the first input terminal and the terminal voltage source, and having a third capacitance defining a first ratio over the first capacitance; and
a fourth capacitor coupled between the second input terminal and the terminal voltage source, and having a fourth capacitance defining a second ratio over the second capacitance, the second ratio approximating the first ratio.
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Abstract
A level shifter includes a signal generator that generates differential signals on a first output and a second output. A first capacitor is coupled between the first output and a first node and a second capacitor is coupled between the second output and a second node. A third capacitor is coupled between the first node and a first voltage potential, wherein the capacitance of the third capacitor is variable. A fourth capacitor is coupled between the second node and the first voltage potential, wherein the capacitance of the fourth capacitor is variable.
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Citations
20 Claims
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1. A circuit comprising:
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a first input terminal adapted to receive a first capacitor having a first capacitance; a second input terminal adapted to receive a second capacitor having a second capacitance; a terminal voltage source; a third capacitor coupled between the first input terminal and the terminal voltage source, and having a third capacitance defining a first ratio over the first capacitance; and a fourth capacitor coupled between the second input terminal and the terminal voltage source, and having a fourth capacitance defining a second ratio over the second capacitance, the second ratio approximating the first ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A level shifter comprising:
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first and second input terminals; a terminal voltage source; a supply voltage source; a first adjustable capacitor coupled between the first input terminal and the terminal voltage source; a second adjustable capacitor coupled between the second input terminal and the terminal voltage source; and a differential amplifier having a supply terminal coupled to the supply voltage source, a first differential input coupled to the first input terminal, a second differential input coupled to the second input terminal, and a differential output. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A level shifter comprising:
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first and second input terminals; a terminal voltage source; a first adjustable capacitor coupled between the first input terminal and the terminal voltage source; a second adjustable capacitor coupled between the second input terminal and the terminal voltage source; a common mode voltage source; a first switch coupled between the first input terminal and the common mode voltage source; and a second switch coupled between the second input terminal and the common mode voltage source. - View Dependent Claims (17, 18, 19, 20)
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Specification