Resistor network and mixer circuits with programmable gain
First Claim
1. A resistor network having an input terminal and an output terminal comprising:
- one or more switched resistor branches, wherein each switched resistor branch comprises;
a first resistor connected in series with a first switch, wherein a first end of the first resistor is connected to the input terminal of the resistor network, a second end of the first resistor is connected to a first end of the first switch forming a middle node, and a second end of the first switch is connected to the output terminal of the resistor network; and
a second resistor connected in series with a second switch, between the middle node and a third terminal; and
the resistor network further comprising;
a third resistor connected between the input and output terminals of the resistor network.
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Accused Products
Abstract
A resistor network comprises one or more switched resistor branches. Each switched resistor branch comprises a first resistor connected in series with a first switch, wherein a first terminal of the first resistor is connected to the input terminal of the resistor network, a second terminal of the first resistor is connected to a first terminal of the first switch forming a middle node, and a second terminal of the first switch is connected to the output terminal of the resistor network. Each switched resistor branch further comprises a second resistor connected in series with a second switch, wherein the series connected second resistor and second switch is connected between the middle node and a third terminal of the one or more switched resistor branches. The resistor network further comprises a third resistor connected between the input and output terminals of the resistor network.
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Citations
19 Claims
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1. A resistor network having an input terminal and an output terminal comprising:
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one or more switched resistor branches, wherein each switched resistor branch comprises; a first resistor connected in series with a first switch, wherein a first end of the first resistor is connected to the input terminal of the resistor network, a second end of the first resistor is connected to a first end of the first switch forming a middle node, and a second end of the first switch is connected to the output terminal of the resistor network; and a second resistor connected in series with a second switch, between the middle node and a third terminal; and
the resistor network further comprising;a third resistor connected between the input and output terminals of the resistor network. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A passive current-mode mixer circuit with programmable gain comprising:
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a resistor network having an input terminal and an output terminal, the resistor network comprising; one or more switched resistor branches, wherein each switched resistor branch comprises; a first resistor connected in series with a first switch, wherein a first end of the first resistor is connected to the input terminal of the resistor network, a second end of the first resistor is connected to a first end of the first switch forming a middle node, and a second end of the first switch is connected to the output terminal of the resistor network; and a second resistor connected in series with a second switch, between the middle node and a third terminal; and
the resistor network further comprising;a third resistor connected between the input and output terminals of the resistor network; and an I/Q mixer comprising an In-phase mixer and a Quadrature mixer, wherein the I/Q mixer is a single-ended mixer or a single-balanced mixer; and
whereininput terminals of the I/Q mixer are connected together and to the output terminal of the resistor network directly or via a capacitor, and the third terminal in each of the one or more switched resistor branches is connected to ground. - View Dependent Claims (9)
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10. A receiver for use in a wireless communication device comprising:
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a passive current-mode mixer circuit with programmable gain, comprising; a resistor network having an input terminal and an output terminal, the resistor network comprising; one or more switched resistor branches, wherein each switched resistor branch comprises; a first resistor connected in series with a first switch, wherein a first end of the first resistor is connected to the input terminal of the resistor network, a second end of the first resistor is connected to a first end of the first switch forming a middle node, and a second end of the first switch is connected to the output terminal of the resistor network; and a second resistor connected in series with a second switch, between the middle node and a third terminal; and
the resistor network further comprising;
a third resistor connected between the input and output terminals of the resistor network; andan I/O mixer comprising an In-phase mixer and a Quadrature mixer, wherein the I/O mixer is a single-ended mixer or a single-balanced mixer; and
whereininput terminals of the I/O mixer are connected together and to the output terminal of the resistor network directly or via a capacitor, and the third terminal in each of the one or more switched resistor branches is connected to ground;
whereinthe input terminal of the resistor network is connected to an input of the receiver directly or through a passive network. - View Dependent Claims (11)
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12. A passive current-mode mixer circuit with programmable gain comprising:
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a first and a second resistor network, each resistor network having an input terminal and an output terminal and comprising; one or more switched resistor branches, wherein each switched resistor branch comprises; a first resistor connected in series with a first switch, wherein a first end of the first resistor is connected to the input terminal of the resistor network, a second end of the first resistor is connected to a first end of the first switch forming a middle node, and a second end of the first switch is connected to the output terminal of the resistor network; and a second resistor connected in series with a second switch, between the middle node and a third terminal; and
the resistor network further comprising;a third resistor connected between the input and output terminals of the resistor network; and an I/Q mixer comprising an In-phase mixer and a Quadrature mixer, wherein the I/Q mixer is a double-balanced mixer; and
whereinthe input terminal of the first resistor network is a first differential input terminal, the input terminal of the second resistor network is a second differential input terminal, a first input terminal of the in-phase mixer is connected together with a first input terminal of the quadrature mixer and to the output terminal of the first resistor network directly or via a first capacitor, a second input terminal of the in-phase mixer is connected together with a second input terminal of the quadrature mixer and to the output terminal of the second resistor network directly or via a second capacitor, and the third terminal in each of the one or more switched resistor branches in the first and second resistor networks is connected to ground. - View Dependent Claims (13)
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14. A passive current-mode mixer circuit with programmable gain comprising:
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a first and a second resistor network, each resistor network having an input terminal and an output terminal and comprising; one or more switched resistor branches, wherein each switched resistor branch comprises; a first resistor connected in series with a first switch, wherein a first end of the first resistor is connected to the input terminal of the resistor network, a second end of the first resistor is connected to a first end of the first switch forming a middle node, and a second end of the first switch is connected to the output terminal of the resistor network; and a second resistor connected in series with a second switch, between the middle node and a third terminal; and
the resistor network further comprising;a third resistor connected between the input and output terminals of the resistor network; and an I/Q mixer comprising an In-phase mixer and a Quadrature mixer, wherein the I/Q mixer is a double-balanced mixer; and
whereinthe input terminal of the first resistor network is a first differential input terminal, the input terminal of the second resistor network is a second differential input terminal, a first input terminal of the in-phase mixer is connected together with a first input terminal of the quadrature mixer and to the output terminal of the first resistor network directly or via a first capacitor, a second input terminal of the in-phase mixer is connected together with a second input terminal of the quadrature mixer and to the output terminal of the second resistor network directly or via a second capacitor, and the third terminal in each of the one or more switched resistor branches in the first resistor network is connected to a corresponding third terminal of one of the one or more switched resistor branches in the second resistor network, and wherein pairs of the second switches of the two resistor networks are combined to single switches. - View Dependent Claims (15)
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16. A receiver for use in a wireless communication device comprising:
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a low noise amplifier with single-ended or differential input and differential output; a passive current-mode mixer circuit with programmable gain comprising; a first and a second resistor network, each resistor network having an input terminal and an output terminal and comprising; one or more switched resistor branches, wherein each switched resistor branch comprises; a first resistor connected in series with a first switch, wherein a first end of the first resistor is connected to the input terminal of the resistor network, a second end of the first resistor is connected to a first end of the first switch forming a middle node, and a second end of the first switch is connected to the output terminal of the resistor network; and a second resistor connected in series with a second switch, between the middle node and a third terminal; and
the resistor network further comprising;
a third resistor connected between the input and output terminals of the resistor network; andan I/O mixer comprising an In-phase mixer and a Quadrature mixer, wherein the I/O mixer is a double-balanced mixer; and
whereinthe input terminal of the first resistor network is a first differential input terminal, the input terminal of the second resistor network is a second differential input terminal, a first input terminal of the in-phase mixer is connected together with a first input terminal of the quadrature mixer and to the output terminal of the first resistor network directly or via a first capacitor, a second input terminal of the in-phase mixer is connected together with a second input terminal of the quadrature mixer and to the output terminal of the second resistor network directly or via a second capacitor, and the third terminal in each of the one or more switched resistor branches in the first and second resistor networks is connected to ground;
whereinthe differential input terminals are connected to first and second differential outputs of the low noise amplifier respectively. - View Dependent Claims (17)
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18. A wireless communication device comprising one or more receivers, each receiver comprising:
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a passive current-mode mixer circuit with programmable gain, comprising; a resistor network having an input terminal and an output terminal, the resistor network comprising; one or more switched resistor branches, wherein each switched resistor branch comprises; a first resistor connected in series with a first switch, wherein a first end of the first resistor is connected to the input terminal of the resistor network, a second end of the first resistor is connected to a first end of the first switch forming a middle node, and a second end of the first switch is connected to the output terminal of the resistor network; and a second resistor connected in series with a second switch, between the middle node and a third terminal; and
the resistor network further comprising;
a third resistor connected between the input and output terminals of the resistor network; andan I/O mixer comprising an In-phase mixer and a Quadrature mixer, wherein the I/O mixer is a single-ended mixer or a single-balanced mixer; and
whereininput terminals of the I/O mixer are connected together and to the output terminal of the resistor network directly or via a capacitor, and the third terminal in each of the one or more switched resistor branches is connected to ground;
whereinthe input terminal of the resistor network is connected to an input of the receiver directly or through a passive network. - View Dependent Claims (19)
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Specification