SWITCHABLE CAPACITIVE ELEMENTS FOR PROGRAMMABLE CAPACITOR ARRAYS
First Claim
1. A switchable capacitive element comprising:
- a field effect transistor (FET) device stack that is operable in an open state and in a closed state, the FET device stack comprising a plurality of FET devices coupled in series to form the FET device stack;
a first capacitor coupled to a first end of the FET device stack and being coupled in series with the FET device stack; and
a second capacitor coupled to a second end of the FET device stack opposite the first end of the FET device stack and being coupled in series with the FET device stack.
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Accused Products
Abstract
Switchable capacitive elements are disclosed, along with programmable capacitor arrays (PCAs). One embodiment of the switchable capacitive element includes a field effect transistor (FET) device stack, a first capacitor, and a second capacitor. The FET device stack is operable in an open state and in a closed state and has a plurality of FET devices coupled in series to form the FET device stack. The first capacitor and the second capacitor are both coupled in series with the FET device stack. However, the first capacitor is coupled to a first end of the FET device stack while the second capacitor is coupled to a second end opposite the first end of the FET device stack. In this manner, the switchable capacitive element can be operated without a negative charge pump, with decreased bias swings, and with a better power performance.
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Citations
25 Claims
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1. A switchable capacitive element comprising:
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a field effect transistor (FET) device stack that is operable in an open state and in a closed state, the FET device stack comprising a plurality of FET devices coupled in series to form the FET device stack; a first capacitor coupled to a first end of the FET device stack and being coupled in series with the FET device stack; and a second capacitor coupled to a second end of the FET device stack opposite the first end of the FET device stack and being coupled in series with the FET device stack. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A programmable capacitor array comprising:
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a first switchable capacitive element, comprising; a first field effect transistor (FET) device stack that is operable in an open state and in a closed state, the first FET device stack comprising a first plurality of FET devices coupled in series to form the first FET device stack; a first capacitor coupled to a first end of the first FET device stack and coupled in series with the first FET device stack; and a second capacitor coupled to a second end of the first FET device stack opposite the first end of the first FET device stack, and coupled in series with the first FET device stack; and a second switchable capacitive element. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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Specification