CROSSTALK REDUCTION IN MULTIPLEXERS
First Claim
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1. A multiplexer, comprising:
- a plurality of multiplexer inputs, each of the multiplexer inputs being a differential input;
a multiplexer output, the multiplexer output being a differential output;
selection circuitry configured to enable an active signal path from a selected one of the multiplexer inputs to the multiplexer output, the selection circuitry also being configured to disable unselected signal paths corresponding to unselected ones of the multiplexer inputs; and
conversion circuitry configured to convert, for each of the unselected signal paths, a corresponding differential signal to a common mode signal.
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Abstract
Multiplexers are described in which differential signals on the signal paths associated with unselected differential inputs are converted to common mode signals to reduce crosstalk between unselected signal paths and the multiplexer'"'"'s active signal path.
7 Citations
22 Claims
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1. A multiplexer, comprising:
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a plurality of multiplexer inputs, each of the multiplexer inputs being a differential input; a multiplexer output, the multiplexer output being a differential output; selection circuitry configured to enable an active signal path from a selected one of the multiplexer inputs to the multiplexer output, the selection circuitry also being configured to disable unselected signal paths corresponding to unselected ones of the multiplexer inputs; and conversion circuitry configured to convert, for each of the unselected signal paths, a corresponding differential signal to a common mode signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A multiplexer, comprising:
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a plurality of multiplexer inputs, each of the multiplexer inputs being a differential input; a multiplexer output, the multiplexer output being a differential output; selection circuitry configured to enable an active signal path from a selected one of the multiplexer inputs to the multiplexer output, the selection circuitry also being configured to disable unselected signal paths corresponding to unselected ones of the multiplexer inputs; and a plurality of active devices, each of the active devices having a high input impedance and being configured to combine complementary signals on complementary circuit nodes of a corresponding one of the unselected signal paths. - View Dependent Claims (17, 18, 19)
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20. A multiplexer, comprising:
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a plurality of multiplexer inputs, each of the multiplexer inputs being a differential input; a multiplexer output, the multiplexer output being a differential output; selection circuitry configured to enable an active signal path from a selected one of the multiplexer inputs to the multiplexer output, the selection circuitry also being configured to disable unselected signal paths corresponding to unselected ones of the multiplexer inputs; a plurality of switches, each of the switches being configured to connect complementary circuit nodes of a corresponding one of the unselected signal paths; and a plurality of isolation circuits, each isolation circuit being associated with a corresponding one of the signal paths and being configured to isolate the corresponding multiplexer input from the common mode signal. - View Dependent Claims (21, 22)
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Specification