Switched resistance device with reduced sensitivity to parasitic capacitance
First Claim
1. A stacked switched resistance device comprising:
- a clock source configured to generate a predetermined clock signal at a predetermined frequency and a predetermined duty cycle; and
a plurality of segments connected in series and configured to produce a first effective resistance, each segment comprising;
a resistor including an inherent resistance and an inherent parasitic capacitance; and
a transistor connected in series with the resistor, the transistor having a control terminal operatively connected to clock source and configured to receive the predetermined clock signal, the transistor being configured to operate as a switch to connect and disconnect a current flow through the resistor in response to the predetermined clock signal,wherein the first effective resistance of the stacked switched resistance device exceeds a second effective resistance of at least one resistor that is connected in series to a single transistor configured to connect and disconnect the at least one resistor in response to the predetermined clock signal, the at least one resistor having an inherent resistance that is equal to a sum of the inherent resistances of the resistors in the plurality of segments and an inherent parasitic capacitance that is equal to a sum of the inherent parasitic capacitances of the resistors in the plurality of segments.
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Accused Products
Abstract
A stacked switched resistance device has been developed. The stacked switched resistance device includes a plurality of segments connected in series. Each segment includes a resistor including an inherent parasitic capacitance, and a switch connected in series with the resistor, the switch being configured to connect and disconnect the resistor from the plurality of segments in response to a predetermined clock signal. An effective resistance of the stacked switched resistance device exceeds another effective resistance of at least one resistor with an equivalent inherent resistance that is connected in series to a single switch configured to connect and disconnect the at least one resistor in response to the predetermined clock signal.
27 Citations
16 Claims
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1. A stacked switched resistance device comprising:
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a clock source configured to generate a predetermined clock signal at a predetermined frequency and a predetermined duty cycle; and a plurality of segments connected in series and configured to produce a first effective resistance, each segment comprising; a resistor including an inherent resistance and an inherent parasitic capacitance; and a transistor connected in series with the resistor, the transistor having a control terminal operatively connected to clock source and configured to receive the predetermined clock signal, the transistor being configured to operate as a switch to connect and disconnect a current flow through the resistor in response to the predetermined clock signal, wherein the first effective resistance of the stacked switched resistance device exceeds a second effective resistance of at least one resistor that is connected in series to a single transistor configured to connect and disconnect the at least one resistor in response to the predetermined clock signal, the at least one resistor having an inherent resistance that is equal to a sum of the inherent resistances of the resistors in the plurality of segments and an inherent parasitic capacitance that is equal to a sum of the inherent parasitic capacitances of the resistors in the plurality of segments. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A filter circuit comprising:
a stacked switched resistance device comprising; an input configured to receive a signal to be filtered in the filter circuit; an output; a clock source configured to generate a predetermined clock signal at a predetermined frequency and a predetermined duty cycle; and a plurality of segments connected in series between the input and the output and configured to produce a first effective resistance, each segment comprising; a resistor including an inherent resistance and an inherent parasitic capacitance; and a transistor connected in series with the resistor, the transistor having a control terminal operatively connected to clock source and configured to receive the predetermined clock signal, the transistor being configured to operate as a switch to connect and disconnect a current flow through the resistor in response to the predetermined clock signal, wherein the first effective resistance of the stacked switched resistance device exceeds a second effective resistance of at least one resistor that is connected in series to a single transistor configured to connect and disconnect the at least one resistor in response to the predetermined clock signal, the at least one resistor having an inherent resistance that is equal to a sum of the inherent resistances of the resistors in the plurality of segments and an inherent parasitic capacitance that is equal to a sum of the inherent parasitic capacitances of the resistors in the plurality of segments; and a filter capacitor connected to the output of the stacked switched resistance device. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
Specification