Electrically variable R/C network and method
First Claim
1. An integrated circuit R/C network for providing a selectively variable impedance comprising a capacitor having a high resistivity semiconductor plate with a low resistivity body contact region therein for providing a variable resistance in series with said capacitor, and a control terminal connected to said plate for selectively applying a control voltage thereto which changes the series resistance to thereby vary the impedance.
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Accused Products
Abstract
An integrated circuit R/C network and method for providing a selectively variable impedance in which a capacitor has a high resistivity semiconductor plate with a low resistivity body contact region therein, the contact region for providing a variable resistance in series with the capacitor, and in which a control terminal is connected to the plate for selectively applying a control voltage thereto which varies the series resistance to thereby vary the impedance of the network.
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Citations
26 Claims
- 1. An integrated circuit R/C network for providing a selectively variable impedance comprising a capacitor having a high resistivity semiconductor plate with a low resistivity body contact region therein for providing a variable resistance in series with said capacitor, and a control terminal connected to said plate for selectively applying a control voltage thereto which changes the series resistance to thereby vary the impedance.
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6. A circuit for providing a variable impedance comprising:
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a capacitor with a plate comprising a first conductivity type, high resistivity semiconductor body; a body contact region comprising a low resistivity region of said body for providing a variable resistance in series with said capacitor; and a control terminal comprising a low resistivity region of a second conductivity type within said body for controlling the series resistance by injecting carriers from said control terminal and from said body contact region into said body in response to application of a control voltage to said control terminal. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. An integrated circuit R/C network for providing a variable impedance comprising:
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a lower plate of a capacitor in the R/C network comprising a semiconductor body of a first conductivity type with a high resistivity; an upper plate of the capacitor separated from said lower plate by a dielectric; a low resistivity body contact region of the first conductivity type in said body and separated from said dielectric for providing a variable resistance in series with the capacitor in the R/C network comprising; and a control region of a second conductivity type in said body spaced from said dielectric and said body contact region and having a low resistivity, for injecting carriers into said body and inducing injection of carriers from said body contact region into said body in response to application of a control voltage to said control region, the magnitude of the control voltage controlling the injection of the carriers into said body so that the series resistance, and thereby the impedance of the R/C network, is a function of the control voltage. - View Dependent Claims (15, 16, 17, 18, 19)
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- 20. A method for varying impedance in an integrated circuit R/C network comprising the steps of connecting a capacitor and a resistive element in series in the network, and applying a control voltage to a plate of the capacitor which changes the series resistance of the network to thereby vary its impedance.
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23. A method for providing a variable impedance in an integrated circuit comprising the steps of:
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providing a capacitor with a plate comprising a first conductivity type, high resistivity semiconductor body; providing a low resistivity body contact region in the body for providing a variable resistance in series with the capacitor; and applying a control voltage to a low resistivity control of a second conductivity type within the body to inject carriers from the control terminal and from the body contact region into the body in response to application of a control voltage to the control terminal. - View Dependent Claims (24, 25, 26)
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Specification